CN114192104A - Adsorbent for adsorbing chromium, preparation method and adsorption method - Google Patents
Adsorbent for adsorbing chromium, preparation method and adsorption method Download PDFInfo
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Abstract
The invention belongs to the technical field of adsorption and separation of heavy metals, and relates to an adsorbent for adsorbing chromium, a preparation method and an adsorption method. The adsorbent is amino functionalized mesoporous silica nanoparticles, is green and environment-friendly, has simple and convenient synthesis process, excellent adsorption performance, and good stability and environmental adaptability. The adsorbent has good adsorption and separation effects on Cr (VI), can realize the separation between Cr (VI) and other heavy metals, and in a selective adsorption experiment, the adsorption removal rate of Cr (VI) can reach 98 percent, while other metals have the adsorption removal rate less than 10 percent. The adsorption separation method provided by the invention is less influenced by the pH value of the acidic aqueous solution, and has good adsorption effect in the acidic solution with the pH value more than or equal to 2.
Description
Technical Field
The invention belongs to the technical field of adsorption and separation of heavy metals, and relates to an adsorbent for adsorbing metal chromium, a preparation method and an adsorption method.
Background
Heavy metal ions such as copper (Cu), cadmium (Cd), lead (Pb), chromium (Cr) and the like cause serious pollution to an ecological system. Although minerals, sediments and the like containing heavy metals in nature can migrate and transform into water bodies along with environmental changes, the heavy metals in industrial wastewater are still the main pollution sources of the water bodies at present. With the development of metallurgical processing, chemical raw materials and product industry, leather and other products, shoe industry, metal and electronic product industry, textile industry and other industries, a large amount of industrial wastewater containing heavy metal ions is discharged into natural water, and seriously threatens water resources which human beings rely on for survival. In recent years, the total amount of the heavy metal emission in industrial wastewater in China still remains high, and the heavy metal emission is a potential pollution source, and forms a potential threat to human health, and the treatment of the heavy metal pollution in water is inevitable. Among the heavy metals, Cr is a recognized carcinogen, wherein the toxicity of Cr (VI) is 100 times that of Cr (III), and Cr (VI) is not naturally degraded in the environment but is easily absorbed by the human body, and can invade the human body through digestion, respiratory tract, skin and mucosa. Vomiting and abdominal pain may occur when entering through the digestive tract. Dermatitis and eczema are produced by skin invasion. The most harmful is the carcinogenic danger of long-term or short-term contact or inhalation.
The current common chromium-containing wastewater treatment technologies comprise physicochemical and biological methods such as chemical precipitation, membrane separation and coagulation flocculation, but the chromium-containing wastewater treatment technologies have inherent advantages and limitations in application. Compared with other treatment technologies, the adsorption method has the advantages of simple and convenient operation, good treatment effect, wide application range and the like, and is one of the most extensive methods for removing the heavy metals in the water body at present. In order to ensure sustainable development of water resources and human health, the development of a treatment technology which is efficient, environment-friendly and wide in application range is an important research direction in the current chromium-containing wastewater treatment field.
However, the traditional adsorbent for treating chromium-containing wastewater has the defects of complex preparation process, overhigh preparation cost, low adsorption capacity of the adsorbent, overhigh cycle cost and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an adsorbent for adsorbing chromium, a preparation method and an adsorption method. The adsorbent disclosed by the invention is good in environmental adaptability, efficient in preparation process, high in adsorption quantity and environment-friendly. The invention synthesizes amino-functionalized mesoporous silica nano-particles with high specific surface area, proper pore diameter and particle size as an adsorbent for adsorbing chromium by using tetraethyl silicate and 3-aminopropyltrimethoxysilane as main raw materials and controlling reaction conditions.
The technical scheme of the invention is as follows:
an adsorbent for adsorbing Cr (VI), which is an amino functionalized mesoporous silica nano material.
According to the invention, preferably, the amino-functionalized mesoporous silica nanomaterial is a mesoporous silica nanomaterial containing amino synthesized by using tetraethyl silicate and 3-aminopropyltrimethoxysilane as main raw materials, and the amino protonated in the solution is combined with Cr electrostatic attraction in the solution, so that chromium is removed.
According to the invention, the pore size distribution range of the amino functionalized mesoporous silica nano material is narrow, and the diameters of pores are intensively distributed at 4.2 nm.
According to the invention, preferably, the adsorbent has a removal rate of more than 98% on the condition of sufficient contact under the conditions that the pH value of the solution is 2, the ratio of the mass of the adsorbent to the volume of the solution is 1mg/mL, the adsorption temperature is 25 ℃;
preferably, the adsorption to other metals is 10% or less.
According to the invention, the preparation method of the adsorbent for adsorbing Cr (VI) comprises the following steps:
tetraethyl silicate and 3-aminopropyl trimethoxy silane are used as reaction raw materials, hexadecyl trimethyl ammonium bromide is used as a template agent, and strong ammonia water is used as a catalyst; and after the reaction is finished, removing the template agent, separating the solid, washing the solid, and drying to obtain the amino functionalized mesoporous silica nano material, namely the adsorbent for adsorbing Cr (VI).
According to the invention, the volume ratio of tetraethyl silicate to 3-aminopropyltrimethoxysilane (1-6) is preferably 1, and most preferably 4: 1.
According to the present invention, the reaction temperature is preferably 30 ℃ to 70 ℃, and may be 30 ℃, 50 ℃, 70 ℃, and more preferably 50 ℃.
According to the invention, the reaction time is preferably 6 to 30 hours; during the reaction, stirring is carried out, preferably at a mechanical stirring rate of 300rpm to 1000 rpm.
According to the present invention, the mass concentration of ammonia water is preferably 26% to 28%.
According to the invention, the reagent used for removing the template agent is ethanol and hydrochloric acid in a volume ratio of 11: 1;
preferably, the reagents used for washing the solids are deionized water and absolute ethanol.
According to the invention, the adsorbent for adsorbing Cr (VI) is applied to adsorbing heavy metal Cr (VI).
According to the invention, the method for adsorbing Cr (VI) by using the adsorbent comprises the following steps:
(1) adjusting the pH value of the solution containing Cr (VI);
(2) dispersing an adsorbent in the solution in the step (1), and fully mixing and contacting;
(3) and (3) centrifuging the fully mixed solution in the step (2), and adsorbing heavy metal Cr (VI) in the aqueous solution on an adsorbing material.
According to the invention, preferably, the pH value is adjusted to 1-13 in the step (1), preferably the pH value is 1-12, and more preferably the pH value is 2-6;
preferably, the reagent used to adjust the pH is hydrochloric acid or sodium hydroxide.
According to the invention, the adsorption temperature in the step (2) is preferably 25-60 ℃, and the adsorption time is 60-150 min.
Preferably, the mass to solution volume ratio of the adsorbent is 0.2 to 1.4 (g/L).
Compared with the prior art, the invention has the advantages and positive effects that:
1. the amino-functionalized mesoporous silica nano material is obtained by taking tetraethyl silicate and 3-aminopropyltrimethoxysilane as main raw materials, amino groups on the material in a solution are positively charged after being protonated and can be combined with negatively charged Cr-containing negative ions through electrostatic attraction, and meanwhile, the protonated amino groups can be mutually repelled with other positively charged metal ions under an acidic condition, so that the amino-functionalized mesoporous silica nano material has good adsorption performance and selectivity.
2. The adsorbent disclosed by the invention is simple in synthesis steps, green and environment-friendly, and good in environmental adaptability and stability.
3. The adsorbent has good adsorption performance and adsorption selectivity on heavy metal Cr (VI), the removal rate of the heavy metal Cr (VI) reaches 98%, and the removal rate on other metals does not exceed 10%.
4. The Zeta potential of the surface of the material of the adsorbent is small in change along with the pH value under an acidic condition; under the condition of applying external driving force, the adsorption equilibrium time is short.
Drawings
FIG. 1 is an IR spectrum characterization of the adsorbent of example 1.
FIG. 2 is a graph showing the pore size distribution of the adsorbent in example 1.
FIG. 3 shows the removal rates of 9 different coexisting metal ions by the adsorbents in example 7.
Detailed Description
In order that the above objects, features and advantages of the present invention may be more clearly understood, the present invention will be further described with reference to specific embodiments. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
The experimental procedures described in the following examples are conventional unless otherwise specified.
The heavy metal mother liquor used in the following examples is a hydrochloric acid solution containing Cr (vi) and/or other metal ions.
After the adsorption separation process is completed, the metal concentration in the solution after the centrifugal separation is measured by ICP-OES (inductively coupled plasma emission spectrometer), and the calculation formula of the metal ion removal rate used is as follows:
wherein, C0And Ce(mg/L) represents the metal ion concentration of the solution before and after adsorption, respectively.
The formula for the calculation of the adsorption capacity used is as follows:
wherein C is0And Ce(mg/L) represents the metal ion concentration in the solution before and after adsorption, respectively; v is the volume of the solution (mL) and m is the mass of the added adsorbent (mg).
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
1. Synthesis of amino functionalized mesoporous silica nano material
A250 mL round bottom flask was charged with 2.0g of cetyltrimethylammonium bromide, 90mL of deionized water and 20mL of ethylene glycol, and the entire system was magnetically stirred at 600rpm for 90 min. After the whole system is stirred uniformly, 3mL of ammonia water with the mass concentration of 28% is added, tetraethyl silicate and 3-aminopropyltrimethoxysilane are added into the reaction system according to a certain volume ratio X:1(X is 1-6) after the ammonia water is added, and the total volume of the tetraethyl silicate and the 3-aminopropyltrimethoxysilane is kept unchanged at 3 mL. After the whole system finishes feeding, the initial growth of the nano particles is finished by heating in a water bath at 50 ℃ and mechanically stirring at a rotating speed of 600rpm for 6 hours, and at the moment, the solution is observed to generate fluorescent blue under strong light. Then, the water bath heating was continued at 50 ℃ with the mechanical stirring speed adjusted to 300rpm, and the water bath stirring was continued for 24 hours. After the reaction is finished, the prepared silicon dioxide nano particles are centrifugally recovered at the rotating speed of 11000rpm, the recovered nano ions are re-dispersed in a mixed solution of ethanol and hydrochloric acid (the volume ratio of the ethanol to the hydrochloric acid is 11: 1), the mixture is subjected to vortex oscillation in a centrifugal tube for 1min and then is centrifugally separated, and the vortex oscillation-centrifugal recovery process is repeated for three times, and then the collected nano particles are dried in an oven at the temperature of 50 ℃ for 12 hours. Dispersing the dried nano particles in deionized water, carrying out vortex oscillation cleaning for 1min, then carrying out centrifugal separation, carrying out vortex oscillation cleaning for 1min by using absolute ethyl alcohol, then carrying out centrifugal separation, repeatedly cleaning once by using the deionized water and the absolute ethyl alcohol, and then drying in a drying oven at 50 ℃ for 12 hours to obtain the amino functionalized mesoporous silicon dioxide nano material.
The synthesized material is characterized, and the characteristic peak in the infrared spectrogram of the attached figure 1 proves that the amino-functionalized silicon dioxide material is successfully synthesized; the pore size distribution diagram in figure 2 shows that the pore size distribution of the adsorption material is concentrated near 4.2nm, which indicates that the adsorption material is a mesoporous silica material.
Adsorption Process for Cr (VI)
Preparing a solution containing Cr (VI): 0.0999mol/L potassium dichromate standard solution is used, and is diluted into 400mg/L Cr (VI) containing solution by deionized water, and hydrochloric acid is added to adjust the pH value to 2.
10mL of 400mg/L Cr (VI) solution is put into a centrifuge tube, 10mg of the prepared six adsorbents with different addition ratios (X is 1-6) are added, the adsorbents are adsorbed for 2 hours under mechanical oscillation at 25 ℃ and 220rpm to ensure that the adsorbents are fully contacted with a water phase, centrifugal separation is carried out after adsorption is finished, the residual concentration of the Cr (VI) in the water phase is tested, and the adsorption capacity is calculated.
When X is 4 in the adsorption separation process, the adsorption capacity under the adsorption condition reaches 389.8 mg/g; and in combination with other material characterization and cost considerations, the resulting adsorbent works best when X is 4.
Example 2
1. Synthesis of amino functionalized mesoporous silica nano material
A250 mL round bottom flask was charged with 2.0g of cetyltrimethylammonium bromide, 90mL of deionized water and 20mL of ethylene glycol, and the entire system was magnetically stirred at 600rpm for 90 min. After the whole system is stirred uniformly, 3mL of ammonia water with the mass concentration of 28% is added, tetraethyl silicate and 3-aminopropyltrimethoxysilane are added into the reaction system according to a certain volume ratio (4:1) after the ammonia water is added, and the total volume of the tetraethyl silicate and the 3-aminopropyltrimethoxysilane is kept unchanged at 3 mL. After the whole system finishes feeding, the initial growth of the nano particles is finished by heating in a water bath at 50 ℃ and mechanically stirring at a rotating speed of 600rpm for 6 hours, and at the moment, the solution is observed to generate fluorescent blue under strong light. Then, the water bath heating was continued at 50 ℃ with the mechanical stirring speed adjusted to 300rpm, and the water bath stirring was continued for 24 hours. After the reaction is finished, the prepared silicon dioxide nano particles are centrifugally recovered at the rotating speed of 11000rpm, the recovered nano ions are re-dispersed in a mixed solution of ethanol and hydrochloric acid (the volume ratio of the ethanol to the hydrochloric acid is 11: 1), the mixture is subjected to vortex oscillation in a centrifugal tube for 1min and then is centrifugally separated, and the vortex oscillation-centrifugal recovery process is repeated for three times, and then the collected nano particles are dried in an oven at the temperature of 50 ℃ for 12 hours. Dispersing the dried nano particles in deionized water, carrying out vortex oscillation cleaning for 1min, then carrying out centrifugal separation, carrying out vortex oscillation cleaning for 1min by using absolute ethyl alcohol, then carrying out centrifugal separation, repeatedly cleaning once by using the deionized water and the absolute ethyl alcohol, and then drying in a drying oven at 50 ℃ for 12 hours to obtain the amino functionalized mesoporous silicon dioxide nano material.
Adsorption Process for Cr (VI)
Preparing a solution containing Cr (VI): a standard solution of potassium dichromate (0.0999 mol/L) was used. Respectively diluting the solution with deionized water to 100mg/L, 200mg/L, 400mg/L, 600mg/L, 800mg/L, 1400mg/L, 1600mg/L, 2000mg/L, 2400mg/L, 2800mg/L, 3200mg/L and 3600mg/L Cr (VI) containing solution, and adding hydrochloric acid to adjust the pH value to 2.
Respectively putting 10mL of the Cr (VI) solution with different concentrations into a centrifuge tube, adding 10mg of the prepared adsorbent, adsorbing for 2 hours under the mechanical oscillation of 25 ℃ and 220rpm to ensure that the adsorbent is fully contacted with the water phase, centrifugally separating after the adsorption is finished, testing the residual concentration of the Cr (VI) in the water phase, and calculating the adsorption capacity. And obtaining the corresponding relation between the equilibrium concentration and the adsorption capacity.
In the adsorption separation process, the adsorption capacity obtained after adsorption under Cr (VI) solutions with different concentrations is plotted against the equilibrium concentration, and the maximum adsorption amount is 2410.9mg/g through Langmuir adsorption isotherm fitting.
Example 3
1. Synthesis of amino functionalized mesoporous silica nano material
The method for synthesizing the nanomaterial in this embodiment is specifically described in example 2.
Adsorption Process for Cr (VI)
Preparing a solution containing Cr (VI): diluting a 0.0999mol/L potassium dichromate standard solution into a 400mg/L Cr (VI) containing solution by using deionized water, and adding hydrochloric acid or sodium hydroxide solution to adjust the pH values to be 1-12 respectively.
The main existing forms of Cr (VI) in aqueous solutions with different pH values are as follows: when the pH value is less than or equal to 7, Cr (VI) is HCrO4 -、Cr2O7 2-Exist as HCrO4 -Mainly comprises the following steps of; when the pH value is more than or equal to 7, Cr (VI) is CrO4 2-、HCrO4 -Present as CrO4 2-Mainly comprises the following steps. Respectively putting 10mL of the Cr (VI) solution with different pH values into a centrifuge tube, adding 10mg of the prepared adsorbent, adsorbing for two hours under the mechanical oscillation of 25 ℃ and 220rpm to ensure that the adsorbent is fully contacted with the water phase, centrifugally separating after the adsorption is finished, testing the residual concentration of the Cr (VI) in the water phase, and calculating the adsorption capacity and removal rate under different initial pH values.
TABLE 1 adsorption Capacity of adsorbent for Cr (VI) at different pH
In the adsorption separation process, under different pH conditions, the adsorption capacity of Cr (VI) is shown in Table 1, and with the increase of pH, the adsorption capacity of the adsorbent to Cr (VI) is firstly increased and then decreased, and is kept at a higher level in an acidic range with the pH being more than 2.
Example 4
1. Synthesis of amino functionalized mesoporous silica nano material
The method for synthesizing the nanomaterial in this embodiment is specifically described in example 2
Adsorption Process for Cr (VI)
Preparing a solution containing Cr (VI): 0.0999mol/L potassium dichromate standard solution is used, and a Cr (VI) containing solution which is 400mg/L is diluted by deionized water, and hydrochloric acid is added to adjust the pH value to 2.
Respectively putting 10mL of the Cr (VI) solution into a centrifuge tube, adding 10mg of the prepared adsorbent, and performing temperature control at 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃, 55 ℃ and 60 ℃; and (3) adsorbing for two hours under the mechanical oscillation of 220rpm to ensure that the adsorbent is fully contacted with the water phase, carrying out centrifugal separation after adsorption is finished, testing the residual concentration of Cr (VI) in the water phase, and calculating the adsorption capacity and removal rate at different temperatures.
In the adsorption separation process, under different temperature conditions, the adsorption capacity of Cr (VI) is shown in Table 2, and the adsorption capacity of the adsorbent to Cr (VI) is gradually reduced with the increase of temperature, but is at a higher level.
TABLE 2 adsorption Capacity of adsorbent for Cr (VI) at different temperatures
| Temperature (. degree.C.) | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 |
| Adsorption capacity (mg/g) | 389 | 379 | 376 | 374 | 371 | 368 | 366 | 365 |
Example 5
1. Synthesis of amino functionalized mesoporous silica nano material
The method for synthesizing the nanomaterial in this embodiment is specifically described in example 2
Adsorption Process for Cr (VI)
Preparing a solution containing Cr (VI): 0.0999mol/L potassium dichromate standard solution is used, 600mg/L Cr (VI) containing solution is diluted by deionized water, and hydrochloric acid is added to adjust the pH value to 2.
Respectively putting 10mL of the Cr (VI) solution into a centrifuge tube, respectively adding 2mg, 4mg, 6mg, 8mg, 10mg, 12mg and 14mg of the prepared adsorbent, adsorbing for two hours under the mechanical oscillation of 25 ℃ and 220rpm to ensure that the adsorbent is fully contacted with the water phase, centrifugally separating after the adsorption is finished, testing the residual concentration of the Cr (VI) in the water phase, and calculating the adsorption capacity and removal rate under different adsorbent amounts.
In the adsorption separation process, under the condition of adding different amounts of the adsorbent, the removal rate of the adsorbent to Cr (VI) is increased along with the increase of the dosage. The results are shown in Table 3.
TABLE 3 removal of Cr (VI) by different mass adsorbents
| Adsorbent amount (mg) | 2 | 4 | 6 | 8 | 10 | 12 | 14 |
| Removal rate | 79.5％ | 92.9％ | 95.9％ | 97.3％ | 97.8％ | 98.3％ | 98.6％ |
Example 6
1. Synthesis of amino functionalized mesoporous silica nano material
The method for synthesizing the nanomaterial in this embodiment is specifically described in example 2
Adsorption Process for Cr (VI)
Preparing a solution containing Cr (VI): using 0.0999mol/L potassium dichromate standard solution, diluting with deionized water to 200mg/L Cr (VI) -containing solution, and respectively preparing Cl containing 200mg/L Cr (VI) and 4 different concentrations (0mM, 5mM, 10mM and 20mM)-，SO4 2-，NO3 -The solutions were adjusted to pH 2.
And respectively putting 10mL of the Cr (VI) solution into a centrifuge tube, adding 10mg of the prepared adsorbent, adsorbing for two hours at 25 ℃ and 220rpm under mechanical oscillation, ensuring that the adsorbent is fully contacted with the water phase, performing centrifugal separation after adsorption is finished, and testing the residual concentration of the Cr (VI) in the water phase.
In the above adsorption separation process, Cl is present in different concentrations-，SO4 2-，NO3 -Has certain influence on the adsorption capacity of the adsorbent, wherein SO4 2-Maximum influence, NO3 -Affecting the next generation, Cl-The effect of (c) is minimal. The results are shown in Table 4.
TABLE 4 Effect of different concentrations of coexisting anions on the adsorption Capacity of the adsorbents
| Concentration/adsorption capacity | Cl- | SO4 2- | NO3 - |
| 0mM | 195mg/g | 195mg/g | 195mg/g |
| 5mM | 194mg/g | 118mg/g | 193mg/g |
| 10mM | 193mg/g | 100mg/g | 191mg/g |
| 20mM | 191mg/g | 97mg/g | 181mg/g |
Example 7
1. Synthesis of amino functionalized mesoporous silica nano material
The method for synthesizing the nanomaterial in this embodiment is specifically described in example 2
Adsorption Process for Cr (VI)
Preparing a multi-metal solution: a multi-metal mixed solution containing nine metal ions of Fe (III), (Ni) (II), (Mn) (II), (Cu (II), (Zn) (II), (Mg) (II), (Co (II), (VI) and Cd (II) with the concentration of 100mg/L is prepared by using 0.0999mol/L of potassium dichromate standard solution, and hydrochloric acid is added to adjust the pH value to 2.
10mL of the multi-metal solution was taken out of the centrifuge tube, 10mg of the prepared adsorbent was added, the adsorbent was adsorbed for two hours at 25 ℃ and 220rpm under mechanical shaking, and after adsorption, the adsorbent was centrifuged to measure the residual concentrations of Fe (III), Ni (II), Mn (II), Cu (II), Zn (II), Mg (II), Co (II), Cr (VI) and Cd (II) in the aqueous phase.
In the adsorption separation process, the removal rate of each metal is shown in fig. 3, and it can be seen from fig. 3 that: the adsorbent has a Cr (VI) removal rate as high as 98 percent, the removal rates of Ni (II), Mn (II), Cu (II), Zn (II), Co (II) and Cd (II) are not more than 5 percent, and the removal rates of Fe (III) and Mg (II) are not more than 10 percent. Therefore, the adsorbent has good selectivity for adsorbing and removing Cr (VI).
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (10)
1. The adsorbent for adsorbing Cr (VI) is characterized in that the adsorbent is an amino functionalized mesoporous silica nanomaterial.
2. The adsorbent for adsorbing Cr (VI) as claimed in claim 1, wherein the amino-functionalized mesoporous silica nanomaterial is a mesoporous silica nanomaterial containing amino groups synthesized from tetraethyl silicate and 3-aminopropyltrimethoxysilane as main raw materials.
3. The adsorbent for adsorbing Cr (VI) as claimed in claim 1, wherein the pore size of the amino functionalized mesoporous silica nanomaterial is concentrated at 4.2 nm.
4. The adsorbent for adsorbing Cr (VI) as claimed in claim 1, wherein the adsorbent has a pH of 2 in solution, a mass-to-volume ratio of 1mg/mL, an adsorption temperature of 25 ℃, and a removal rate of heavy metal Cr (VI) of more than 98% under sufficient contact conditions;
preferably, the adsorption to other metals is 10% or less.
5. The method for preparing the adsorbent for adsorbing Cr (VI) as claimed in claim 1, which comprises the following steps:
tetraethyl silicate and 3-aminopropyl trimethoxy silane are used as reaction raw materials, hexadecyl trimethyl ammonium bromide is used as a template agent, and strong ammonia water is used as a catalyst; and after the reaction is finished, removing the template agent, separating the solid, washing the solid, and drying to obtain the amino functionalized mesoporous silica nano material, namely the adsorbent for adsorbing Cr (VI).
6. The preparation method of the adsorbent for adsorbing Cr (VI) as claimed in claim 5, wherein the volume ratio of tetraethyl silicate to 3-aminopropyltrimethoxysilane (1-6: 1), preferably 4: 1.
7. The method for preparing the adsorbent for adsorbing Cr (VI) according to claim 5, wherein the reaction temperature is 30-70 ℃;
preferably, the reaction time is 6 to 30 hours;
preferably, the mass concentration of the ammonia water is 26-28%;
preferably, the reagent used for removing the template is ethanol and hydrochloric acid in a volume ratio of 11: 1;
preferably, the reagents used for washing the solids are deionized water and absolute ethanol.
8. Use of the adsorbent for adsorbing Cr (VI) as claimed in claim 1 for adsorbing heavy metal Cr (VI).
9. A method for adsorbing Cr (vi) comprising using the adsorbent of claim 1, comprising the steps of:
(1) adjusting the pH value of the solution containing Cr (VI);
(2) dispersing an adsorbent in the solution in the step (1), and fully mixing and contacting;
(3) and (3) centrifuging the fully mixed solution in the step (2), and adsorbing heavy metal Cr (VI) in the aqueous solution on an adsorbing material.
10. The method for adsorbing Cr (VI) according to claim 9, wherein the pH is adjusted to 1-13 in the step (1);
preferably, the adsorption temperature in the step (2) is 25-60 ℃, and the adsorption time is 60-150 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111440663.1A CN114192104B (en) | 2021-11-30 | 2021-11-30 | Adsorbent for adsorbing chromium, preparation method and adsorption method |
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