CN113117634A - Heavy metal adsorbent and preparation method and application thereof - Google Patents
Heavy metal adsorbent and preparation method and application thereof Download PDFInfo
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- CN113117634A CN113117634A CN202110583134.0A CN202110583134A CN113117634A CN 113117634 A CN113117634 A CN 113117634A CN 202110583134 A CN202110583134 A CN 202110583134A CN 113117634 A CN113117634 A CN 113117634A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0211—Compounds of Ti, Zr, Hf
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
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- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/37—Phosphates of heavy metals
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Abstract
The invention provides a heavy metal adsorbent and a preparation method and application thereof. The heavy metal adsorbent can function even at a low pH to remove heavy metal elements such as thallium from wastewater. The adsorbent provided by the invention is large in pH value range, can adsorb thallium in wastewater even under an acidic condition with low pH value, is good in adsorption effect, can effectively remove thallium pollutants in various water bodies such as underground water, surface water, chemical wastewater, mine wastewater and the like, and has a removal rate of 99.8%.
Description
Technical Field
The invention belongs to the technical field of heavy metal wastewater treatment, and particularly relates to a heavy metal adsorbent and a preparation method and application thereof.
Background
Methods for removing thallium contaminants include complexation and adsorption. Among them, the adsorption method is the most effective method for removing thallium contaminants in groundwater, surface water and industrial wastewater. The method has the advantages of simple operation, low cost, less sludge production, low secondary pollution risk and the like, and is suitable for a water treatment system with large treatment capacity and lower pollutant concentration.
The adsorption method is characterized in that a solid material is used as an adsorbent, and thallium pollutants are transferred from a water phase to the surface of the adsorbent through physical adsorption, chemical adsorption or ion exchange, so that the aim of removing thallium in water is fulfilled.
In the related art, a plurality of adsorbing materials for removing thallium are available, and mainly comprise natural minerals, industrial and agricultural wastes and artificially synthesized adsorbing materials. From a cost perspective, lower cost adsorbents are zeolites, montmorillonite, kaolin, and cellulose. From the viewpoint of the preparation method, the artificially synthesized adsorbing material mainly comprises the following components: active carbon, titanium dioxide, titanium peroxide, manganese dioxide, hydrated iron oxide, iron-manganese composite oxide, magnetic ferroferric oxide, aluminum oxide and the like.
However, most of the existing thallium-removing adsorbing materials have a good thallium-removing effect only under the condition that the pH is 7 or more, and when the pH is low, most of the existing thallium-removing adsorbing materials have positive charges, and thallium in wastewater also has positive charges, so that the thallium-removing effect is poor, and the stability of some thallium-removing adsorbing materials under acidic conditions is poor. In practical conditions, the pH of many thallium-containing wastewaters is low (e.g. mine wastewater pH 2.7), thus limiting the practical application of the sorbent material.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems in the prior art. Therefore, the invention provides a heavy metal adsorbent which can play a role even under the condition of low pH value and remove heavy metal elements such as thallium and the like in wastewater.
The invention also provides a method for preparing the heavy metal adsorbent.
The invention also provides application of the heavy metal adsorbent in heavy metal wastewater treatment.
The invention also provides a heavy metal wastewater treating agent which comprises the heavy metal adsorbent.
In a first aspect of the invention, there is provided a heavy metal adsorbent comprising titanium polyphosphate.
The heavy metal adsorbent disclosed by the invention at least has the following beneficial effects:
the heavy metal adsorbent provided by the invention is wide in pH value range, can adsorb thallium in wastewater even under an acidic condition with low pH value, is good in adsorption effect, can effectively remove thallium pollutants in various water bodies such as underground water, surface water, chemical wastewater, mine wastewater and the like, and has a removal rate of 99.8%.
The heavy metal adsorbent of the invention has good removal capability on heavy metal elements such as cadmium, lead, copper, antimony, nickel and the like in water.
The heavy metal adsorbent disclosed by the invention has better stability and heat resistance.
According to some embodiments of the invention, the titanium polyphosphate is titanium tripolyphosphate or tetrapolyphosphate.
According to some embodiments of the invention, the heavy metal adsorbent has a particle size of 10nm to 1 μm.
The heavy metal adsorbent has a particle size of 10 nm-1 μm, can be a nano-scale or micron-scale particle aggregate, and has a large surface area and good adsorption performance.
The second aspect of the present invention provides a method for preparing the above heavy metal adsorbent, comprising the steps of:
s1: adding acid into the polyphosphate to prepare a mixed solution;
s2: and adding titanium salt into the mixed solution for reaction.
The preparation method of the heavy metal adsorbent has at least the following beneficial effects:
the preparation method of the heavy metal adsorbent is simple to operate, low in reaction condition requirement and low in cost.
According to some embodiments of the invention, the method for preparing the heavy metal adsorbent comprises the following steps:
adding acid into the tripolyphosphate or tetrapolyphosphate solution, adjusting the pH value to prepare a mixed solution, adding titanium salt into the mixed solution, reacting, aging and filtering to obtain filter residue which is the adsorbent.
According to some embodiments of the invention, the polyphosphate salt is a tripolyphosphate salt or a tetrapolyphosphate salt.
According to some embodiments of the invention, the molar ratio of the tripolyphosphate to the titanium salt is (0.2-4): 1.
according to some embodiments of the invention, the molar ratio of the tetrapolyphosphate to the titanium salt is (0.3-2): 1.
according to some embodiments of the invention, the tripolyphosphate salt includes at least one of sodium tripolyphosphate, potassium tripolyphosphate, or ammonium tripolyphosphate.
According to some embodiments of the invention, the tetrapolyphosphate comprises at least one of sodium tetrapolyphosphate, potassium tetrapolyphosphate or ammonium tetrapolyphosphate.
According to some embodiments of the invention, in step S1, the pH of the mixture is 0-6.
According to some embodiments of the invention, in step S1, the pH of the mixture is 0-3.
According to some embodiments of the invention, the acid added in step S1 includes at least one of concentrated hydrochloric acid, concentrated nitric acid, and concentrated sulfuric acid.
According to some embodiments of the invention, the temperature of the reaction in step S2 is between 25 ℃ and 180 ℃.
According to some embodiments of the invention, the temperature of the reaction is 85 ℃ to 160 ℃ in step S2.
According to some embodiments of the invention, the temperature of the reaction in step S2 is between 90 ℃ and 150 ℃.
According to some embodiments of the present invention, in step S2, the time after the reaction is 1 to 24 hours.
According to some embodiments of the present invention, in step S2, the time after the reaction is 8 to 24 hours.
According to some embodiments of the present invention, in step S2, the filter residue obtained after filtration is the adsorbent, and the filter residue may be further purified, where the purification method includes water washing and drying.
According to some embodiments of the invention, the drying process is first drying at 40-60 ℃ for 1-12 h, and then drying at 90-120 ℃ for 6-24 h.
According to some embodiments of the invention, the drying process is drying at 40-55 ℃ for 1-12 h, and then at 100-110 ℃ for 6-24 h.
According to some embodiments of the invention, the titanium salt comprises at least one of titanium tetrachloride, titanium oxychloride, titanium nitrate, or titanium sulfate.
The third aspect of the invention provides the application of the heavy metal adsorbent in heavy metal wastewater treatment.
The invention provides a heavy metal wastewater treatment agent, which comprises the heavy metal adsorbent.
Drawings
Fig. 1 is one of SEM images of the heavy metal adsorbent prepared in example 1.
Fig. 2 is a second SEM image of the heavy metal adsorbent prepared in example 1.
FIG. 3 is a transmission electron micrograph of titanium tripolyphosphate adsorbent-1 prepared in example 1.
FIG. 4 is an SEM photograph of a heavy metal adsorbent prepared in example 27.
FIG. 5 is a second SEM photograph of the heavy metal adsorbent prepared in example 27.
FIG. 6 is a transmission electron micrograph of titanium tetrapolyphosphate adsorbent-1 obtained in example 27.
FIG. 7 is a transmission electron micrograph of titanium tetrapolyphosphate adsorbent-1 obtained in example 27.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention will be further described with reference to the examples, but the present invention is not limited to the examples.
In the following examples and comparative examples, alumina adsorbent, titania adsorbent, hydrated iron oxide adsorbent, manganese dioxide adsorbent were purchased from Topson Biotech, Inc., Beijing. A
The remaining materials, reagents or equipment used may be obtained from conventional commercial sources or may be prepared by known methods, unless otherwise specified.
Example 1: preparation of the adsorbent
In this example, titanium tripolyphosphate heavy metal adsorbent-1 is prepared, and the specific process is as follows:
weighing 0.2mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, adjusting pH to 1, rapidly stirring at room temperature, adding 0.25mol Ti (SO)4)2Stirring is continued for 1h, and then standing and aging at room temperature for 24 h.
Pouring water on the solid filter cake, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 4 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 2h at 50 ℃, heating to 100 ℃, and drying for 12h to obtain the titanium tripolyphosphate heavy metal adsorbent-1.
FIGS. 1 and 2 are SEM images of the adsorbent prepared in example 1, and it can be seen that the titanium tripolyphosphate adsorbent-1 nanoparticles are formed by agglomeration of lamellar structures and are in a flower-like shape.
FIG. 3 is a Transmission Electron Micrograph (TEM) of titanium tripolyphosphate heavy metal adsorbent-1, showing aggregation of the floret-like particles.
Example 2: preparation of the adsorbent
In this example, titanium tripolyphosphate heavy metal adsorbent-2 is prepared, and the specific process is as follows:
weighing 0.2mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, adjusting pH to 2, rapidly stirring at room temperature, adding 0.4mol Ti (SO)4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. Pouring out water on the solid filter cake, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the solid filter cake in an oven, drying for 8h at 55 ℃, and heating to 100 ℃ for drying for 8 h.
Example 3: preparation of the adsorbent
In this example, titanium tripolyphosphate heavy metal adsorbent-3 is prepared, and the specific process is as follows:
weighing 0.2mol Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 0; the solution was stirred rapidly at room temperature, 0.5mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 150 ℃. And taking out after the completion, standing at room temperature and aging for 8 h. Pouring the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 4 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 12h at 40 ℃, heating to 100 ℃, and drying for 6h to obtain the titanium tripolyphosphate heavy metal adsorbent-3.
Example 4: preparation of the adsorbent
The titanium tripolyphosphate heavy metal adsorbent-4 is prepared by the embodiment, and the specific process is as follows:
weighing 0.2mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 1; the solution was stirred rapidly at room temperature, 0.6mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 8 hours in an oven at 85 ℃. And taking out after the completion, standing at room temperature and aging for 6 h. Pouring the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 9h at 45 ℃, heating to 100 ℃, and drying for 20h to obtain the titanium tripolyphosphate heavy metal adsorbent-4.
Example 5: preparation of the adsorbent
In this example, titanium tripolyphosphate heavy metal adsorbent-5 is prepared, and the specific process is as follows:
weighing 0.4mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 1; the solution was stirred rapidly at room temperature, 0.2mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 8 hours in an oven at 180 ℃. And taking out after the completion, standing at room temperature and aging for 6 h. Pouring the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 9h at the temperature of 43 ℃, heating to the temperature of 120 ℃, and drying for 12h to obtain the titanium tripolyphosphate heavy metal adsorbent-5.
Example 6: preparation of the adsorbent
The titanium tripolyphosphate heavy metal adsorbent-6 is prepared by the embodiment, and the specific process is as follows:
weighing 0.2mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 4; the solution was stirred rapidly at room temperature, 0.4mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at the temperature of 55 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. The top water was poured off and 1000mL of deionized water was addedStirring and washing the mixture for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using deionized water, after separating the adsorbent, placing the adsorbent in a drying oven to dry for 8 hours at 55 ℃, and heating to 100 ℃ to dry for 8 hours to obtain the titanium tripolyphosphate heavy metal adsorbent-6.
Example 7: preparation of the adsorbent
The titanium tripolyphosphate heavy metal adsorbent-7 is prepared by the embodiment, and the specific process is as follows:
weighing 0.2mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated sulfuric acid, and adjusting the pH value of the solution to 2; the solution was stirred rapidly at room temperature, 0.4mol of titanium tetrachloride were added. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. Pouring the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 8h at 55 ℃, heating to 100 ℃, and drying for 8h to obtain the titanium tripolyphosphate heavy metal adsorbent-7.
Example 8: preparation of the adsorbent
The titanium tripolyphosphate heavy metal adsorbent-8 is prepared by the embodiment, and the specific process is as follows:
weighing 0.2mol of Na5P3O10Dissolving in 200mL of water to prepare a solution; adding concentrated nitric acid, and adjusting the pH value of the solution to 2; the solution was stirred rapidly at room temperature, 0.4mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. Pouring the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, and then placing the adsorbent in an oven to dry for 16h at 85 ℃ to obtain the titanium tripolyphosphate heavy metal adsorbent-8.
Example 9: preparation of the adsorbent
The titanium tripolyphosphate heavy metal adsorbent-9 is prepared by the embodiment, and the specific process is as follows:
weighing 0.2mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 1; the solution was stirred rapidly at room temperature, 0.25mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 1h in an oven at the temperature of 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 24 hours. Pouring the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 4 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 2 hours at 50 ℃, heating to 100 ℃, and drying for 12 hours to obtain the titanium tripolyphosphate heavy metal adsorbent-9.
Example 10: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.260mg/L and a wastewater pH of 7.0. 0.8g of the titanium tripolyphosphate heavy metal adsorbent-2 prepared in the example 2 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 1h, and the thallium concentration in the wastewater is measured by an ICP-MS method and is measured to be 1.582 mug/L (less than 5 mug/L).
Example 11: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.829mg/L and a wastewater pH of 5.5. 0.45g of the titanium tripolyphosphate heavy metal adsorbent-1 prepared in example 1 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 2h, and the thallium concentration in the wastewater is measured by an ICP-MS method, so that the thallium concentration in the wastewater is 3.904 mug/L (less than 5 mug/L).
Example 12: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.819mg/L and a wastewater pH of 3.5. 0.5g of the titanium tripolyphosphate heavy metal adsorbent-3 prepared in the example 3 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 1h, and the thallium concentration in the wastewater is measured by an ICP-MS method and is measured to be 4.801 mug/L (less than 5 mug/L).
Example 13: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.863mg/L and a wastewater pH of 5.5. 0.8g of the titanium tripolyphosphate heavy metal adsorbent-4 prepared in example 4 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 1h, and the thallium concentration in the wastewater is measured by an ICP-MS method, so that the thallium concentration in the wastewater is 3.287 mug/L (less than 5 mug/L).
Example 14: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.876mg/L and a wastewater pH of 5.5. 0.8g of the titanium tripolyphosphate heavy metal adsorbent-5 prepared in example 5 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 1h, and the thallium concentration in the wastewater is measured by an ICP-MS method, so that the thallium concentration in the wastewater is 4.870 mug/L (less than 5 mug/L).
Example 15: treatment of wastewater with adsorbents
The monovalent thallium concentration of certain thallium-containing wastewater is 1.855mg/L, and the pH of the wastewater is 6.5. 0.5g of the titanium tripolyphosphate heavy metal adsorbent-6 prepared in example 6 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 1h, and the concentration of thallium in the wastewater is measured by an ICP-MS method, so that the concentration of thallium in the wastewater is 4.65 mug/L (less than 5 mug/L).
Example 16: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.769mg/L and a wastewater pH of 6.5. 0.5g of the titanium tripolyphosphate heavy metal adsorbent-7 prepared in example 7 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 1h, and the thallium concentration in the wastewater is measured by an ICP-MS method, so that the thallium concentration in the wastewater is 3.177 mug/L (less than 5 mug/L).
Example 17: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.364mg/L and a wastewater pH of 6.5. 0.5g of the titanium tripolyphosphate heavy metal adsorbent-8 prepared in example 8 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 1h, and the thallium concentration in the wastewater is measured by an ICP-MS method, so that the thallium concentration in the wastewater is 4.882 mug/L (less than 5 mug/L).
Example 18: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.361mg/L and a wastewater pH of 5.5. 0.45g of the titanium tripolyphosphate heavy metal adsorbent-9 prepared in example 9 is added into 1L of wastewater, solid-liquid separation is carried out after stirring and mixing for 2h, and the thallium concentration in the wastewater is measured by an ICP-MS method, so that the thallium concentration in the wastewater is 4.711 mug/L (less than 5 mug/L).
Example 19: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.270mg/L and a wastewater pH of 3.5. Taking 1L of wastewater, adding 0.8g of the titanium tripolyphosphate heavy metal adsorbent-2 prepared in the example 2, stirring and mixing for 1h, then carrying out solid-liquid separation, and measuring the thallium concentration in the wastewater by adopting an ICP-MS method to obtain the thallium concentration in the wastewater of 2.188 [ mu ] g/L (less than 5 [ mu ] g/L).
Example 20: treatment of wastewater with adsorbents
The cadmium concentration of certain cadmium-containing wastewater is 12.975mg/L, and the pH value of the wastewater is 7.0. Taking 1L of wastewater, adding 0.8g of the titanium tripolyphosphate heavy metal adsorbent-5 prepared in the example 5, stirring and mixing for 1h, then carrying out solid-liquid separation, and measuring the concentration of cadmium in the wastewater by adopting an ICP-MS method to obtain that the concentration of cadmium in the wastewater is 1.800 mu g/L (less than 0.05 mg/L).
Example 21: treatment of wastewater with adsorbents
In a certain lead-containing wastewater, the lead concentration was 5.287mg/L, and the pH of the wastewater was 3.0. 0.8g of the titanium tripolyphosphate heavy metal adsorbent-4 prepared in example 4 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the concentration of lead in the wastewater was measured by an ICP-MS method, and the concentration of lead in the wastewater was 1.668. mu.g/L (less than 5. mu.g/L).
Example 22: treatment of wastewater with adsorbents
The copper concentration of a certain copper-containing wastewater is 3.467mg/L, and the pH of the wastewater is 6.5. 0.8g of the titanium tripolyphosphate heavy metal adsorbent-4 prepared in example 4 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the concentration of copper in the wastewater was measured by an ICP-MS method, and the concentration of copper in the wastewater was 9.200. mu.g/L (less than 0.05 mg/L).
Example 23: treatment of wastewater with adsorbents
The antimony concentration of a certain antimony-containing wastewater is 2.744mg/L, and the pH of the wastewater is 2.5. Taking 1L of wastewater, adding 0.8g of the titanium tripolyphosphate heavy metal adsorbent-2 prepared in the example 2, stirring and mixing for 1h, then carrying out solid-liquid separation, and measuring the concentration of antimony in the wastewater by adopting an ICP-MS method to obtain the concentration of antimony in the wastewater to be 5.797 mu g/L (less than 6 mu g/L).
Example 24: treatment of wastewater with adsorbents
Certain nickel-containing wastewater has a nickel concentration of 3.169mg/L and a wastewater pH of 7.5. 1L of wastewater is taken, 1.0g of the titanium tripolyphosphate heavy metal adsorbent-4 prepared in the example 4 is added, the mixture is stirred and mixed for 1 hour, then solid-liquid separation is carried out, the concentration of nickel in the wastewater is measured by an ICP-MS method, and the concentration of nickel in the wastewater is measured to be 92.300 mu g/L (less than 0.5 mg/L).
Example 25: treatment of wastewater with adsorbents
The thallium concentration of the acid mine wastewater is 4.317 mu g/L, and the pH of the wastewater is 2.7. Taking 1L of wastewater, adding 0.2g of the titanium tripolyphosphate heavy metal adsorbent-2 prepared in the example 2, stirring and mixing for 1h, then carrying out solid-liquid separation, and measuring the thallium concentration in the wastewater by adopting an ICP-MS method to obtain the thallium concentration in the wastewater of 0.314 [ mu ] g/L (less than 5 [ mu ] g/L).
Example 26: treatment of wastewater with adsorbents
The antimony concentration of acid mine wastewater is 14.876 mug/L, and the pH of the wastewater is 2.7. Taking 1L of wastewater, adding 0.1g of the titanium tripolyphosphate heavy metal adsorbent-2 prepared in the example 2, stirring and mixing for 1h, then carrying out solid-liquid separation, and measuring the concentration of antimony in the wastewater by adopting an ICP-MS method to obtain that the concentration of antimony in the wastewater is 4.600 mu g/L (less than 6 mu g/L).
Comparative example 1: alumina adsorbent for treating waste water
The thallium-containing wastewater has a monovalent thallium concentration of 6.923mg/L and a wastewater pH of 2.7. Taking 1L of wastewater, adding 0.8g of alumina adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, measuring the thallium concentration in the wastewater by adopting an ICP-OES method, and measuring the thallium concentration in the wastewater to be 0.818mg/L and the aluminum concentration to be 0.819mg/L (material dissolution).
Comparative example 2: titanium dioxide adsorbent for treating wastewater
The thallium-containing wastewater has a thallium concentration of 2.157mg/L and a wastewater pH of 2.7. Taking 1L of wastewater, adding 0.8g of titanium dioxide adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, and measuring the thallium concentration in the wastewater by adopting an ICP-OES method to obtain the thallium concentration in the wastewater of 0.205 mg/L.
Comparative example 3: treatment of waste water by hydrated iron oxide adsorbent
The thallium-containing wastewater has a monovalent thallium concentration of 4.121mg/L and a wastewater pH of 3.0. Taking 1L of wastewater, adding 0.6g of hydrated iron oxide adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, measuring the thallium concentration in the wastewater by adopting an ICP-OES method, and measuring the thallium concentration in the wastewater to be 0.335mg/L and the iron concentration to be 2.19mg/L (material dissolution).
Comparative example 4: manganese dioxide adsorbent for treating wastewater
The thallium-containing wastewater has a monovalent thallium concentration of 5.029mg/L and a wastewater pH of 3.5. Taking 1L of wastewater, adding 0.5g of manganese dioxide adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, measuring the thallium concentration in the wastewater by adopting an ICP-OES method, and measuring the thallium concentration in the wastewater to be 0.183mg/L and the manganese concentration to be 1.211mg/L (material dissolution).
Example 27: preparation of the adsorbent
In this example, titanium tetrapolyphosphate heavy metal adsorbent-1 is prepared, and the specific process is as follows:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, adjusting pH to 1, rapidly stirring at room temperature, adding 0.25mol Ti (SO)4)2Stirring is continued for 1h, and then standing and aging at room temperature for 24 h.
Pouring water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 4 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 2h at 50 ℃, heating to 100 ℃, and drying for 12h to obtain the titanium tetrapolyphosphate heavy metal adsorbent-1.
Fig. 4 and 5 are SEM images of the heavy metal adsorbent prepared in example 27, and it can be seen that the titanium tetrapolyphosphate adsorbent-1 nanoparticles are formed by agglomeration of a lamellar structure and have a pleated flower shape.
FIGS. 6 and 7 are Transmission Electron Micrographs (TEM) of titanium tetrapolyphosphate heavy metal adsorbent-1, showing aggregation of the small flower-like particles.
Example 28: preparation of the adsorbent
In this example, titanium tetrapolyphosphate heavy metal adsorbent-2 was prepared by the following specific process:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, adjusting pH to 2, rapidly stirring at room temperature, adding 0.4mol Ti (SO)4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. Pouring out water on the solid filter cake, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the solid filter cake in an oven, drying for 8h at 55 ℃, and heating to 100 ℃ for drying for 8 h.
Example 29: preparation of the adsorbent
In the embodiment, titanium tetrapolyphosphate heavy metal adsorbent-3 is prepared, and the specific process comprises the following steps:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 0; the solution was stirred rapidly at room temperature, 0.5mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 150 ℃. And taking out after the completion, standing at room temperature and aging for 8 h. Pouring water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 4 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 12h at 40 ℃, heating to 100 ℃, and drying for 6h to obtain the titanium tetrapolyphosphate heavy metal adsorbent-3.
Example 30: preparation of the adsorbent
In the embodiment, titanium tetrapolyphosphate heavy metal adsorbent-4 is prepared, and the specific process comprises the following steps:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to obtain a solutionLiquid;
adding concentrated nitric acid, and adjusting the pH value of the solution to 1; the solution was stirred rapidly at room temperature, 0.6mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 8 hours in an oven at 85 ℃. And taking out after the completion, standing at room temperature and aging for 6 h. Pouring water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 9h at 45 ℃, heating to 100 ℃, and drying for 20h to obtain the titanium tetrapolyphosphate heavy metal adsorbent-4.
Example 31: preparation of the adsorbent
In this example, titanium tetrapolyphosphate heavy metal adsorbent-5 was prepared, and the specific process was:
weighing 0.4mol of Na5P3O10Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 1; the solution was stirred rapidly at room temperature, 0.2mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 8 hours in an oven at 180 ℃. And taking out after the completion, standing at room temperature and aging for 6 h. Pouring water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 9h at the temperature of 43 ℃, heating to 120 ℃, and drying for 12h to obtain the titanium tetrapolyphosphate heavy metal adsorbent-5.
Example 32: preparation of the adsorbent
In this example, titanium tetrapolyphosphate heavy metal adsorbent-6 was prepared, and the specific process was:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 4; the solution was stirred rapidly at room temperature, 0.4mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at the temperature of 55 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. PouringRemoving the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 8h at 55 ℃, heating to 100 ℃, and drying for 8h to obtain the titanium tetrapolyphosphate heavy metal adsorbent-6.
Example 33: preparation of the adsorbent
In this example, titanium tetrapolyphosphate heavy metal adsorbent-7 was prepared by the following specific process:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to prepare a solution;
adding concentrated sulfuric acid, and adjusting the pH value of the solution to 2; the solution was stirred rapidly at room temperature, 0.4mol of titanium tetrachloride were added. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. Pouring water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 8h at 55 ℃, heating to 100 ℃ and drying for 8h to obtain the titanium tetrapolyphosphate heavy metal adsorbent-7.
Example 34: preparation of the adsorbent
In the embodiment, titanium tetrapolyphosphate heavy metal adsorbent-8 is prepared, and the specific process comprises the following steps:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to prepare a solution; adding concentrated nitric acid, and adjusting the pH value of the solution to 2; the solution was stirred rapidly at room temperature, 0.4mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 6 hours in an oven at 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 12 hours. Pouring the water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 3 times by using the deionized water, separating out the adsorbent, and then placing the adsorbent in an oven to dry for 16h at 85 ℃ to obtain the titanium tetrapolyphosphate heavy metal adsorbent-8.
Example 35: preparation of the adsorbent
In the embodiment, titanium tetrapolyphosphate heavy metal adsorbent-9 is prepared, and the specific process comprises the following steps:
weighing 0.2mol of Na6P4O13Dissolving in 200mL of water to prepare a solution;
adding concentrated nitric acid, and adjusting the pH value of the solution to 1; the solution was stirred rapidly at room temperature, 0.25mol of Ti (SO) was added4)2. Then the mixture is poured into a reaction kettle, and the hydrothermal reaction is continued for 1h in an oven at the temperature of 100 ℃. And taking out the mixture after the completion, standing the mixture at room temperature and aging the mixture for 24 hours. Pouring water, adding 1000mL of deionized water, stirring, washing for 10min, performing solid-liquid separation by adopting a suction filtration method, continuously washing the solid filter cake for 4 times by using the deionized water, separating out the adsorbent, placing the adsorbent in an oven, drying for 2 hours at 50 ℃, heating to 100 ℃, and drying for 12 hours to obtain the titanium tetrapolyphosphate heavy metal adsorbent-9.
Example 36: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.260mg/L and a wastewater pH of 7.0. 0.8g of the titanium tetrapolyphosphate heavy metal adsorbent-2 prepared in example 28 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, and found to be 1.582. mu.g/L (less than 5. mu.g/L).
Example 37: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.829mg/L and a wastewater pH of 5.5. 0.45g of titanium tetrapolyphosphate heavy metal adsorbent-1 prepared in example 27 was added to 1L of wastewater, and after stirring and mixing for 2 hours, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, and found to be 3.904. mu.g/L (less than 5. mu.g/L).
Example 38: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.819mg/L and a wastewater pH of 3.5. 0.5g of the titanium tetrapolyphosphate heavy metal adsorbent-3 prepared in example 29 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, and it was found that the thallium concentration in the wastewater was 4.801. mu.g/L (less than 5. mu.g/L).
Example 39: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.863mg/L and a wastewater pH of 5.5. 0.8g of the titanium tetrapolyphosphate adsorbent-4 prepared in example 30 was added to 1L of the wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, whereby the thallium concentration in the wastewater was 3.287. mu.g/L (less than 5. mu.g/L).
Example 40: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.876mg/L and a wastewater pH of 5.5. 0.8g of the titanium tetrapolyphosphate heavy metal adsorbent-5 prepared in example 31 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, whereby the thallium concentration in the wastewater was 4.870. mu.g/L (less than 5. mu.g/L).
Example 41: treatment of wastewater with adsorbents
The monovalent thallium concentration of certain thallium-containing wastewater is 1.855mg/L, and the pH of the wastewater is 6.5. 0.5g of the titanium tetrapolyphosphate heavy metal adsorbent-6 prepared in example 32 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, and the thallium concentration in the wastewater was measured to be 4.65. mu.g/L (less than 5. mu.g/L).
Example 42: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.769mg/L and a wastewater pH of 6.5. 0.5g of the titanium tetrapolyphosphate heavy metal adsorbent-7 prepared in example 33 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, whereby the thallium concentration in the wastewater was 3.177. mu.g/L (less than 5. mu.g/L).
Example 43: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.364mg/L and a wastewater pH of 6.5. 0.5g of the titanium tetrapolyphosphate adsorbent-8 prepared in example 34 was added to 1L of the wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was carried out, and the thallium concentration in the wastewater was measured by an ICP-MS method, whereby the thallium concentration in the wastewater was 4.882. mu.g/L (less than 5. mu.g/L).
Example 44: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.361mg/L and a wastewater pH of 5.5. 0.45g of the titanium tetrapolyphosphate heavy metal adsorbent-9 prepared in example 35 was added to 1L of wastewater, and after stirring and mixing for 2 hours, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, whereby the thallium concentration in the wastewater was 4.711. mu.g/L (less than 5. mu.g/L).
Example 45: treatment of wastewater with adsorbents
The thallium-containing wastewater has a monovalent thallium concentration of 1.270mg/L and a wastewater pH of 3.5. 0.8g of the titanium tetrapolyphosphate adsorbent-2 prepared in example 38 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, and found to be 2.188. mu.g/L (less than 5. mu.g/L).
Example 46: treatment of wastewater with adsorbents
The cadmium concentration of certain cadmium-containing wastewater is 12.975mg/L, and the pH value of the wastewater is 7.0. 0.8g of the titanium tetrapolyphosphate heavy metal adsorbent-5 prepared in example 31 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the concentration of cadmium in the wastewater was measured by an ICP-MS method, whereby the concentration of cadmium in the wastewater was 1.800. mu.g/L (less than 0.05 mg/L).
Example 47: treatment of wastewater with adsorbents
In a certain lead-containing wastewater, the lead concentration was 5.287mg/L, and the pH of the wastewater was 3.0. 0.8g of the titanium tetrapolyphosphate heavy metal adsorbent-30 prepared in example 30 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the concentration of lead in the wastewater was measured by an ICP-MS method, whereby the concentration of lead in the wastewater was 1.668. mu.g/L (less than 5. mu.g/L).
Example 48: treatment of wastewater with adsorbents
The copper concentration of a certain copper-containing wastewater is 3.467mg/L, and the pH of the wastewater is 6.5. 0.8g of the titanium tetrapolyphosphate heavy metal adsorbent-30 prepared in example 4 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the concentration of copper in the wastewater was measured by an ICP-MS method, whereby the concentration of copper in the wastewater was 9.200. mu.g/L (less than 0.05 mg/L).
Example 49: treatment of wastewater with adsorbents
The antimony concentration of a certain antimony-containing wastewater is 2.744mg/L, and the pH of the wastewater is 2.5. 0.8g of the titanium tetrapolyphosphate adsorbent-28 prepared in example 2 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the concentration of antimony in the wastewater was measured by an ICP-MS method, whereby the concentration of antimony in the wastewater was 5.797. mu.g/L (less than 6. mu.g/L).
Example 50: treatment of wastewater with adsorbents
Certain nickel-containing wastewater has a nickel concentration of 3.169mg/L and a wastewater pH of 7.5. 1L of wastewater is taken, 1.0g of the titanium tetrapolyphosphate heavy metal adsorbent-30 prepared in example 4 is added, stirring and mixing are carried out for 1h, then solid-liquid separation is carried out, the concentration of nickel in the wastewater is measured by an ICP-MS method, and the concentration of nickel in the wastewater is measured to be 92.300 mu g/L (less than 0.5 mg/L).
Example 51: treatment of wastewater with adsorbents
The thallium concentration of the acid mine wastewater is 4.317 mu g/L, and the pH of the wastewater is 2.7. 0.2g of the titanium tetrapolyphosphate heavy metal adsorbent-2 prepared in example 28 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the thallium concentration in the wastewater was measured by an ICP-MS method, and the thallium concentration in the wastewater was measured to be 0.314. mu.g/L (less than 5. mu.g/L).
Example 52: treatment of wastewater with adsorbents
The antimony concentration of acid mine wastewater is 14.876 mug/L, and the pH of the wastewater is 2.7. 0.1g of titanium tetrapolyphosphate heavy metal adsorbent-2 prepared in example 28 was added to 1L of wastewater, and after stirring and mixing for 1 hour, solid-liquid separation was performed, and the concentration of antimony in the wastewater was measured by an ICP-MS method, whereby the concentration of antimony in the wastewater was 4.600. mu.g/L (less than 6. mu.g/L).
Comparative example 5: alumina adsorbent for treating waste water
The thallium-containing wastewater has a monovalent thallium concentration of 6.923mg/L and a wastewater pH of 2.7. Taking 1L of wastewater, adding 0.8g of alumina adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, measuring the thallium concentration in the wastewater by adopting an ICP-OES method, and measuring the thallium concentration in the wastewater to be 0.818mg/L and the aluminum concentration to be 0.819mg/L (material dissolution).
Comparative example 6: titanium dioxide adsorbent for treating wastewater
The thallium-containing wastewater has a thallium concentration of 2.157mg/L and a wastewater pH of 2.7. Taking 1L of wastewater, adding 0.8g of titanium dioxide adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, and measuring the thallium concentration in the wastewater by adopting an ICP-OES method to obtain the thallium concentration in the wastewater of 0.205 mg/L.
Comparative example 7: treatment of waste water by hydrated iron oxide adsorbent
The thallium-containing wastewater has a monovalent thallium concentration of 4.121mg/L and a wastewater pH of 3.0. Taking 1L of wastewater, adding 0.6g of hydrated iron oxide adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, measuring the thallium concentration in the wastewater by adopting an ICP-OES method, and measuring the thallium concentration in the wastewater to be 0.335mg/L and the iron concentration to be 2.19mg/L (material dissolution).
Comparative example 8: manganese dioxide adsorbent for treating wastewater
The thallium-containing wastewater has a monovalent thallium concentration of 5.029mg/L and a wastewater pH of 3.5. Taking 1L of wastewater, adding 0.5g of manganese dioxide adsorbent, stirring and mixing for 1h, then carrying out solid-liquid separation, measuring the thallium concentration in the wastewater by adopting an ICP-OES method, and measuring the thallium concentration in the wastewater to be 0.183mg/L and the manganese concentration to be 1.211mg/L (material dissolution).
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments described above, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The heavy metal adsorbent is characterized by comprising titanium polyphosphate.
2. The heavy metal adsorbent according to claim 1, wherein the titanium polyphosphate is titanium tripolyphosphate or titanium tetrapolyphosphate.
3. A method for preparing the heavy metal adsorbent according to claim 1 or 2, comprising the steps of:
s1: adding acid into the polyphosphate to prepare a mixed solution;
s2: and adding titanium salt into the mixed solution for reaction.
4. The method according to claim 3, wherein the polyphosphate is a tripolyphosphate or a tetrapolyphosphate.
5. The method according to claim 4, wherein the molar ratio of the tripolyphosphate to the titanium salt is (0.2-4): 1.
6. the method according to claim 4, wherein the molar ratio of the tetrapolyphosphate to the titanium salt is (0.3-2): 1.
7. the method according to claim 3, wherein in step S1, the pH of the mixed solution is 0 to 6.
8. The method of claim 3, wherein the titanium salt comprises at least one of titanium tetrachloride, titanium oxychloride, titanium nitrate, or titanium sulfate.
9. Use of the heavy metal adsorbent of claim 1 or 2 in the treatment of heavy metal wastewater.
10. A heavy metal wastewater treatment agent comprising the heavy metal adsorbent according to claim 1 or 2.
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| CN116272872A (en) * | 2023-04-27 | 2023-06-23 | 湖南大学 | Nonmetallic doped bulk carbon material for adsorbing thallium, preparation method and method for removing thallium in water |
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