CN108970589B - Hydrotalcite-based composite gel ball and preparation method and application thereof - Google Patents
Hydrotalcite-based composite gel ball and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a hydrotalcite-based composite gel ball and a preparation method and application thereof, belonging to the technical field of adsorbent preparation and water treatment. The invention fully utilizes the gel property of sodium alginate to combine the sodium alginate and the roasted hydrotalcite which are two natural materials together, thereby successfully preparing the hydrotalcite-based composite gel bead adsorbent with good adsorption performance. The hydrotalcite-based composite gel ball not only fully utilizes the excellent adsorption performance of hydrotalcite, but also exerts the non-toxicity, good adsorption capacity and excellent forming capacity of sodium alginate, improves the adsorption effect and is convenient to recover and separate.
Description
Technical Field
The invention belongs to the technical field of adsorbent preparation and water treatment, and particularly relates to a hydrotalcite-based composite gel ball and a preparation method and application thereof.
Background
In recent years, the development of the pharmaceutical intermediate industry is rapid, and the problem of treatment of production wastewater is also followed. The waste water produced by the industry has various pollutant types, complex components, great treatment difficulty and high treatment cost, and is one of the industrial waste water with the most serious pollution and the most difficult treatment in China. The discharge amount of phenols, anilines, chlorobenzene and other toxic and harmful aromatic compounds accounts for the first place of the discharge amount of wastewater in the chemical industry. Therefore, the treatment of wastewater from the production of pharmaceutical intermediates is imminent.
At present, the common methods for treating pharmaceutical industry wastewater include a physical chemical method, a biochemical treatment method, a combination of various process methods and the like. The adsorption method has the advantages of high adsorption rate, high efficiency, simple operation, low price, easy recycling and the like, shows good application prospect in the aspect of organic matter treatment, and is widely applied and researched. However, due to the high regeneration and purchase costs of adsorbents such as activated carbon, more and more researchers have attempted to develop inexpensive adsorbents from materials that exist in nature for the removal of toxic organic pollutants. Layered Double Hydroxides (LDH) are naturally occurring minerals, and are a class of anionic clay type inorganic nanomaterials which are rapidly developed in recent years. Due to the special structure and physicochemical properties of LDH, the compounds and the roasted products thereof have wide application prospects in the fields of adsorption, catalysis, ion exchange and the like. In recent years, researchers have studied the adsorption effect of LDH on pollutants in the wastewater generated in the production of medical intermediates, and the adsorption amount of NiAl-LDH modified by sodium citrate synthesized by Sun et al on nitrophenol can reach 77.7 mg/g.
Although the powdery adsorbent has large specific surface area and excellent adsorption performance, the particle size is small and is not easy to fix, so that the powdery adsorbent has no good selectivity in the adsorption process and is not easy to recycle, and certain adsorbents have certain biotoxicity. Sodium Alginate (SA) is a sodium salt of polyanionic polysaccharide (alginic acid) extracted from natural brown algae, and has attracted extensive research interest in the field of adsorption separation due to its characteristics of stability, non-toxicity, excellent film-forming property or balling property, selectivity, degradability, low cost, etc. Therefore, further research on the industrial wastewater adsorption treatment material is needed, so that an adsorbent material which is more environment-friendly, economical and efficient and is convenient to recycle is obtained.
Disclosure of Invention
Aiming at the defects of the prior art, the inventor provides a hydrotalcite-based composite gel ball and a preparation method and application thereof through long-term technical and practical exploration. The invention fully utilizes the gel property of sodium alginate to combine the sodium alginate and roasted hydrotalcite (CLDH) which are two natural materials together, thereby successfully preparing the hydrotalcite-based composite gel bead adsorbent with good adsorption property. The hydrotalcite-based composite gel ball not only makes full use of the excellent adsorption performance of hydrotalcite, but also exerts the non-toxicity, good adsorption capacity and excellent forming capacity of sodium alginate, improves the adsorption effect, is convenient to recover and separate, and has good industrial application prospect and practical application value.
The invention aims to provide a preparation method of hydrotalcite-based composite gel spheres.
The invention also aims to provide the hydrotalcite-based composite gel ball prepared by the method.
The invention also aims to provide application of the hydrotalcite-based composite gel ball.
In order to realize the purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a method for preparing hydrotalcite-based composite gel beads, the method comprising:
s1, adding roasted hydrotalcite into a sodium alginate aqueous solution to obtain an SA-CLDH suspension;
s2, slowly adding CaCl into the SA-CLDH suspension prepared in the step S1 2 Solidifying the solution to obtain the hydrotalcite-based composite gel spheres.
Preferably, the mass ratio of the sodium alginate to the roasted hydrotalcite is 1: 1-5, more preferably 1: 2-4, and even more preferably 1:2, 1:3 or 1: 4;
preferably, the method for preparing the calcined hydrotalcite comprises the following steps: roasting the hydrotalcite at the temperature of 400-600 ℃ for 2-5 h; further preferably, the hydrotalcite is roasted for 3 hours at 500 ℃;
preferably, the mass concentration of sodium alginate in the SA-CLDH suspension is 1-3%, and more preferably 2%; wherein the viscosity of the sodium alginate is 300-1000 mpa & s (preferably 350mpa & s);
preferably, the mass concentration of the calcined hydrotalcite in the SA-CLDH suspension is 2-10%, and more preferably 8%;
preferably, the CaCl is 2 The concentration of the solution is 1-3%, and the preferable concentration is 2%;
preferably, the specific method in step S2 is: dripping the SA-CLDH suspension prepared in the step S1 into CaCl which is heated in water bath at the temperature of 20-60 ℃ and is continuously stirred 2 Stirring the solution for 1 to 12 hours, continuously stirring and curing the solution for 12 to 48 hours at room temperature after the reaction is completed, and purifying the solution to obtain hydrotalcite-based composite gel spheres;
wherein the water bath heating temperature is preferably 40 ℃, and the curing time is preferably 24 h;
the purification step specifically comprises: washing the gel spheres with deionized water to remove excess Ca 2+ And freeze-drying to obtain the hydrotalcite-based composite gel balls.
In a second aspect of the present invention, there is provided the hydrotalcite-based composite gel beads prepared by the above method.
In a third aspect of the present invention, there is provided an application of the hydrotalcite-based composite gel beads in removing organic pollutants in a water body, wherein the application method specifically includes: adding the hydrotalcite-based composite gel balls into a water body containing organic pollutants for oscillation adsorption.
Wherein the organic pollutant comprises one or more of p-nitrophenol (PNP), p-aminophenol (PAP) and p-nitrochlorobenzene (p-NCB);
the mass ratio of the hydrotalcite-based composite gel spheres to the organic pollutants is 100: 0.1 to 5;
the concentration of the organic pollutants in the water body is 5-100 mg/L.
The application also comprises the recycling of the hydrotalcite-based composite gel balls after organic pollutants in water are removed.
Wherein the organic pollutant comprises one or more of p-nitrophenol (PNP), p-aminophenol (PAP) and p-nitrochlorobenzene (p-NCB).
The invention has the beneficial effects that:
(1) the hydrotalcite-based composite gel spheres are successfully prepared only by roasting hydrotalcite and sodium alginate for the first time, the preparation method is simple and easy to control, the cost of the preparation raw materials is low, and the hydrotalcite-based composite gel spheres are economic and environment-friendly and are easy to industrially popularize and apply;
(2) the method can realize the high-efficiency removal of the organic pollutants under the condition of smaller addition amount of the adsorbent, and the removal rate is over 80 percent;
(3) the hydrotalcite-based composite gel ball prepared by the method has the same adsorption effect on organic pollutants in water, such as PNP, PAP, p-NCB and the like as CLDH powder, the adsorption rates on PNP, PAP and p-NCB can respectively reach 85.25%, 89.83% and 80.57%, but the recycling is more convenient and efficient, and the secondary utilization can still keep higher adsorption rate on the pollutants, thereby effectively saving the cost.
Drawings
Fig. 1 is a photograph showing the hydrotalcite-based composite gel beads prepared according to the present invention, wherein fig. 1a-d are sequentially: CLDH, 0% CLDH-SA gel beads, 6% CLDH-SA gel beads and 8% CLDH-SA gel beads.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, there is a need for further research on the adsorption treatment material for industrial wastewater, so as to obtain an adsorbent material which is more environmentally friendly, economical and efficient, and is convenient for recycling.
In view of the above, one embodiment of the present invention provides a method for preparing hydrotalcite-based composite gel beads, comprising the following steps:
(1) dissolving SA in deionized water, continuously stirring and ultrasonically dispersing to obtain uniform and transparent colloidal solution;
(2) adding CLDH into the solution obtained in the step (1), continuously stirring and ultrasonically dispersing, standing and defoaming to obtain a uniform suspension;
(3) adding CaCl 2 Dissolving in deionized water to obtain a uniform and transparent solution;
(4) dropwise adding the solution obtained in the step (2) into the solution obtained in the step (3) which is continuously stirred in a water bath at the temperature of 20-60 ℃ through a peristaltic pump, stirring for 1-12 h, stirring and curing at room temperature for 12-48 h after the reaction is completed, taking out gel balls, and washing away redundant Ca through deionized water 2+ And (5) freeze-drying to obtain the hydrotalcite-based composite gel balls.
The preparation method of the invention uses SA as embedding agent and CaCl 2 Is a cross-linking agent, and CLDH is a main adsorbent, thus successfully synthesizing the hydrotalcite-based composite gel ball. By controlling the viscosity, concentration, CaCl of SA 2 Concentration of CLDH, amount of CLDH, curing time, temperature and rotational speed of the peristaltic pump control the shape, size and strength of the gel spheres.
The calcined hydrotalcite (CLDH) selected in the invention is obtained by calcining hydrotalcite at 500 ℃ for 3 hours; the inventor researches and discovers that the hydrotalcite obtained by roasting at the temperature has good memory effect and larger specific surface area, so that the adsorption rate of pollutants is effectively improved, and the hydrotalcite-based composite gel spheres prepared by roasting the hydrotalcite have more stable shapes, are similar to spheres, have no adhesion phenomenon among the gel spheres and are more convenient to recycle.
Wherein, SA and CaCl 2 And CLDH participates in the synthesis process of the hydrotalcite-based composite gel spheres, and the change of the dosage and the concentration does not influence the generation of products, but influences the performance of the prepared hydrotalcite-based composite gel spheres. In order to reduce the waste of raw materials and time and simultaneously obtain high-performance hydrotalcite-based composite gel balls, SA and CaCl 2 And the concentration of CLDH is preferably: 2%: 2%: 8 percent;
SA-CLDH suspension and CaCl 2 The proportion of the amount of (A) is preferably: 20mL of: 50 mL;
the viscosity of SA is preferably 350mpa · s, the curing time is preferably 24h, the temperature is preferably 40 ℃ and the rotational speed of the peristaltic pump is preferably 150 r/min.
In another embodiment of the present invention, a method for removing organic pollutants in water by adsorption using the hydrotalcite-based composite gel bead adsorbent is disclosed, which comprises the following steps:
adding the hydrotalcite-based composite gel balls into a water body containing organic pollutants, and oscillating for 2-8h at room temperature.
Wherein the organic pollutant comprises one or more of p-nitrophenol (PNP), p-aminophenol (PAP) and p-nitrochlorobenzene (p-NCB);
the mass ratio of the hydrotalcite-based composite gel spheres to the organic pollutants is 100: 0.1 to 5;
the concentration of the organic pollutants in the water body is 5-100 mg/L.
In another embodiment of the present invention, the hydrotalcite-based composite gel bead adsorbent is collected and reused for adsorbing organic pollutants in water, wherein the organic pollutants include any one or more of p-nitrophenol (PNP), p-aminophenol (PAP), and p-nitrochlorobenzene (p-NCB), and tests show that the hydrotalcite-based composite gel bead adsorbent has high reusability in PNP removal applications.
The present invention is further illustrated by reference to specific examples, which are intended to be illustrative only and not limiting. If the experimental specific conditions not noted in the examples, they are generally according to the conventional conditions, or according to the conditions recommended by the sales companies; the present invention is not particularly limited, and may be commercially available. The calcined hydrotalcite (CLDH) selected in the following specific examples was prepared by calcining hydrotalcite at 500 ℃ for 3 hours.
Example 1: preparation method of hydrotalcite-based composite gel spheres
(1) Dissolving 0.6g of SA with the viscosity of 1000mpa · s in 20mL of deionized water, continuously stirring and ultrasonically dispersing to obtain a uniform and transparent colloidal solution of SA with the mass volume fraction of 3%;
(2) adding 1g of CaCl 2 Dissolving in 50mL of deionized water to obtain CaCl with the mass volume fraction of 2% 2 A homogeneous transparent solution;
(3) dropwise adding the solution obtained in the step (1) into the solution obtained in the step (2) with a water bath at 40 ℃ and a rotating speed of 5r/min through a peristaltic pump at a speed of 40r/min, continuously stirring for 2h, after the reaction is completed, stirring and curing for 24h at room temperature, taking out gel balls, washing off excessive Ca by using deionized water 2+ And (3) freeze-drying to obtain the hydrotalcite-based composite gel ball 1: 0% CLDH-SA gel beads.
Example 2: preparation method of hydrotalcite-based composite gel spheres
(1) Dissolving 0.2g of SA with the viscosity of 550mpa · s in 20mL of deionized water, continuously stirring and ultrasonically dispersing to obtain a uniform and transparent colloidal solution of SA with the mass volume fraction of 1%;
(2) adding 0.4g of CLDH into the colloidal solution obtained in the step (1), continuously stirring and ultrasonically dispersing, standing and defoaming to obtain a uniform suspension;
(3) adding 1g of CaCl 2 Dissolving in 50mL of deionized water to obtain CaCl with the mass volume fraction of 2% 2 A homogeneous transparent solution;
(4) dropwise adding the solution obtained in the step (2) into the solution obtained in the step (3) with a water bath at 30 ℃ and a rotating speed of 5r/min through a peristaltic pump at a speed of 150r/min, continuously stirring for 2h, after the reaction is completed, stirring and curing for 12h at room temperature, taking out gel balls, washing off excessive Ca with deionized water 2+ And (3) freeze-drying to obtain the hydrotalcite-based composite gel ball 1: 2% CLDH-SA gel beads.
Example 3: preparation method of hydrotalcite-based composite gel spheres
(1) Dissolving 0.4g of SA with the viscosity of 350mpa · s in 20mL of deionized water, continuously stirring and ultrasonically dispersing to obtain a uniform and transparent colloidal solution of SA with the mass volume fraction of 2%;
(2) adding 1.2g of CLDH into the colloidal solution obtained in the step (1), continuously stirring and ultrasonically dispersing, standing and defoaming to obtain a uniform suspension;
(3) adding 1g of CaCl 2 Dissolving in 50mL of deionized water to obtain CaCl with the mass volume fraction of 2% 2 A homogeneous transparent solution;
(4) dropwise adding the solution obtained in the step (2) into the solution obtained in the step (3) with a water bath at 40 ℃ and a rotating speed of 5r/min through a peristaltic pump at a speed of 150r/min, continuously stirring for 4h, after the reaction is completed, stirring and curing for 24h at room temperature, taking out gel balls, washing off excessive Ca by using deionized water 2+ And (3) freeze-drying to obtain the hydrotalcite-based composite gel ball 2: 6% CLDH-SA gel beads.
Example 4: preparation method of hydrotalcite-based composite gel spheres
(1) Dissolving 0.4g of SA with the viscosity of 350mpa · s in 20mL of deionized water, continuously stirring and ultrasonically dispersing to obtain a uniform and transparent colloidal solution of SA with the mass volume fraction of 2%;
(2) adding 1.6g of CLDH into the colloidal solution obtained in the step (1), continuously stirring and ultrasonically dispersing, standing and defoaming to obtain a uniform suspension;
(3) adding 1g of CaCl 2 Dissolving in 50mL of deionized water to obtain CaCl with the mass volume fraction of 2% 2 A homogeneous transparent solution;
(4) dropwise adding the solution obtained in the step (2) into the solution obtained in the step (3) with a water bath of 50 ℃ and a rotating speed of 5r/min through a peristaltic pump at a speed of 150r/min, continuously stirring for 8 hours, after the reaction is completed, stirring and curing for 36 hours at room temperature, taking out gel balls, washing away excessive Ca with deionized water 2+ And (3) freeze-drying to obtain the hydrotalcite-based composite gel balls 3: 8% CLDH-SA gel beads.
Example 5: removal of organic PNP
And (3) taking 20mL of PNP solution with the concentration of 100mg/L into a 50mL centrifuge tube, adding 0.05g of the hydrotalcite-based composite gel spheres obtained in the step (4), oscillating for 5 hours at room temperature, standing, taking supernate to detect the concentration of the organic pollutants, and calculating the removal rate of the organic pollutants to be 85.25% according to the initial concentration of the organic pollutants in the solution and the residual concentration of the organic pollutants in the adsorbed solution.
Example 6: removal of organic PAP
And (3) taking 20mL of PAP solution with the concentration of 50mg/L into a 50mL centrifuge tube, adding 0.20g of the hydrotalcite-based composite gel spheres obtained in the example 4, oscillating for 6 hours at room temperature, standing, taking supernate to detect the concentration of the organic pollutants, and calculating the removal rate of the organic pollutants to be 89.83% according to the initial concentration of the organic pollutants in the solution and the residual concentration of the organic pollutants in the adsorbed solution.
Example 7: removal of organic p-NCB
And (3) putting 20mL of p-NCB solution with the concentration of 20mg/L into a 50mL centrifuge tube, adding 0.15g of the hydrotalcite-based composite gel spheres obtained in the example 4, oscillating for 8 hours at room temperature, standing, taking supernate to detect the concentration of the organic pollutants, and calculating the removal rate of the organic pollutants to be 80.57% according to the initial concentration of the organic pollutants in the solution and the residual concentration of the organic pollutants in the adsorbed solution.
Example 8: recycling of organic pollutants in water removed by hydrotalcite-based composite gel beads 1
Washing the gel balls adsorbed with PNP in example 5 with deionized water to remove the PNP which is not firmly adsorbed on the surface, placing 10 balls in 10mL of deionized water and 10mL of ethanol respectively, oscillating for 5h, detecting the concentration of PNP in the deionized water and the ethanol, calculating the desorption rate of the gel balls according to the amount of PNP adsorbed on the gel balls and the concentration of PNP in the deionized water and the ethanol, and then naturally drying the desorbed gel balls for second adsorption. Repeating the steps for 3 times, the desorption rates of the gel spheres desorbed by the deionized water are 1.92%, 5.26% and 4.48%, the adsorption rates are 84.49%, 79.73% and 77.11%, the desorption rates of the gel spheres desorbed by the ethanol are 7.99%, 10.30% and 11.67%, and the adsorption rates are 84.90%, 76.32% and 70.93%, so that the method can only elute a small amount of PNP, the effect of the ethanol is higher than that of the deionized water, but the adsorption rates of the gel spheres adsorbed again are still high, which indicates that the gel spheres can firmly adsorb the PNP and have high reusability in the application of removing the PNP.
Example 9: recycling of organic pollutants in water removed by hydrotalcite-based composite gel beads 2
Washing the gel spheres adsorbing PAP in example 6 with deionized water to remove the PAP which is not firmly adsorbed on the surface, placing 10 spheres in 10mL of deionized water and 10mL of ethanol respectively, oscillating for 5h, detecting the concentration of PAP in the deionized water and the ethanol, calculating the desorption rate of the gel spheres according to the amount of PAP adsorbed on the gel spheres and the concentration of PNP in the deionized water and the ethanol, and naturally drying the desorbed gel spheres for secondary adsorption. Repeating the above steps for 3 times, the desorption rates of the gel beads desorbed by the deionized water are 4.17%, 11.25% and 12.47% in sequence, the adsorption rates are 86.89%, 69.40% and 52.98% in sequence, the desorption rates of the gel beads desorbed by the ethanol are 0.72%, 4.67% and 7.65% in sequence, and the adsorption rates are 87.41%, 58.42% and 42.15% in sequence, so that the deionized water can elute more PAP than ethanol, and the adsorption rates of the re-adsorption are reduced in sequence, which indicates that the reusability of the gel beads in PAP removal application is greatly limited.
Example 10: recycling of organic pollutants in water removed by hydrotalcite-based composite gel beads 3
Washing the gel spheres adsorbed with the p-NCB in the example 7 with deionized water to remove the p-NCB which is not firmly adsorbed on the surface, placing 10 spheres in 10mL of deionized water and 10mL of ethanol respectively, oscillating for 5 hours, detecting the concentration of the p-NCB in the deionized water and the ethanol, calculating the desorption rate of the gel spheres according to the amount of the p-NCB adsorbed on the gel spheres and the concentration of the p-NCB in the deionized water and the ethanol, naturally drying the desorbed gel spheres, and then carrying out secondary adsorption. The above steps are repeated for 3 times, the desorption rates of the gel spheres desorbed by the deionized water are 10.34%, 18.60% and 30.04%, the adsorption rates are 81.75%, 66.97% and 58.02%, the desorption rates of the gel spheres desorbed by the ethanol are 19.91%, 25.34% and 52.04%, and the adsorption rates are 80.85%, 68.77% and 56.52%, so that the adsorption rates of the gel spheres desorbed again are reduced in turn compared with the case that the deionized water can elute more p-NCB, which indicates that the reusability of the gel spheres in the application of p-NCB removal is greatly limited.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The application of the hydrotalcite-based composite gel spheres in removing organic pollutants in water is characterized in that the application method comprises the following steps: adding the hydrotalcite-based composite gel balls into a water body containing organic pollutants for oscillation adsorption;
the application also comprises the recycling of the hydrotalcite-based composite gel balls after organic pollutants in water are removed; the specific recycling method comprises the following steps: washing the hydrotalcite-based composite gel balls adsorbing the organic pollutants by deionized water to remove the organic pollutants which are not firmly adsorbed on the surfaces, and then oscillating and desorbing in ethanol; then naturally drying the desorbed hydrotalcite-based composite gel spheres in the air, and performing second adsorption, and repeating the steps for 3 times;
wherein the organic pollutant is p-nitrophenol;
the preparation method of the hydrotalcite-based composite gel ball comprises the following steps:
s1, adding the roasted hydrotalcite into a sodium alginate aqueous solution to obtain SA-CLDH suspension;
the mass ratio of the sodium alginate to the roasted hydrotalcite is 1: 1-5;
the mass concentration of sodium alginate in the SA-CLDH suspension is 1-3%; the viscosity of the sodium alginate is 300-1000 mpa · s;
the mass concentration of the roasted hydrotalcite in the SA-CLDH turbid liquid is 2-10%;
s2, slowly adding the SA-CLDH suspension prepared in the step S1 to the CaCl 2 Solidifying the solution to obtain hydrotalcite-based composite gel balls, wherein the CaCl is 2 The mass volume fraction of the solution is 1-3%;
the specific method of the step S2 is as follows: dripping the SA-CLDH suspension prepared in the step S1 into CaCl which is heated in a water bath at the temperature of 20-60 ℃ and is continuously stirred 2 Stirring the solution for 1 to 12 hours, continuously stirring and curing the solution for 12 to 48 hours at room temperature after the reaction is completed, and purifying the solution to obtain hydrotalcite-based composite gel spheres;
the preparation method of the calcined hydrotalcite comprises the following steps: roasting the hydrotalcite at the temperature of 400-600 ℃ for 2-5 h;
the mass ratio of the hydrotalcite-based composite gel spheres to the organic pollutants is 100: 0.1 to 5;
the concentration of the organic pollutants in the water body is 5-100 mg/L.
2. The application of claim 1, wherein the mass ratio of the sodium alginate to the roasted hydrotalcite is 1: 2-4.
3. The use of claim 2, wherein the mass ratio of sodium alginate to calcined hydrotalcite is 1:2 or 1:3 or 1: 4.
4. Use according to any one of claims 1 to 3, wherein the hydrotalcite is calcined at 500 ℃ for 3 h.
5. The use of claim 1, wherein the suspension of SA-CLDH has a sodium alginate concentration of 2% by mass.
6. The use as claimed in claim 1, wherein sodium alginate has a viscosity of 350 mpa-s.
7. Use according to claim 1, wherein the calcined hydrotalcite is present in the SA-CLDH suspension at a mass concentration of 8%.
8. The method of claim 1Characterized in that the CaCl is 2 The mass volume fraction of the solution was 2%.
9. The use according to claim 1, wherein the water bath heating temperature is 40 ℃ and the curing treatment time is 24 h;
the purification step specifically comprises: washing the gel spheres with deionized water to remove excess Ca 2+ And freeze-drying to obtain the hydrotalcite-based composite gel balls.
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| CN115193404A (en) * | 2022-03-31 | 2022-10-18 | 武汉工程大学 | Layered mineral microsphere material, synthesis method thereof and application of layered mineral microsphere material in chromium-contaminated soil remediation |
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| "Entrapment of Mg-Al layered double hydroxide in calcium alginate beads for phosphate removal from aqueous solution";Yong-Un Han等;《Desalination and Water Treatment》;20111231;第36卷;第179页右栏第2.1-2.2节、第183页Fig.4 * |
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