CN109847718B - Hydrous zirconia/strontium alginate composite gel bead and preparation method and application thereof - Google Patents
Hydrous zirconia/strontium alginate composite gel bead and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a strontium alginate gel bead product wrapping hydrous zirconia and adsorption application thereof. Mixing the hydrous zirconia dispersion liquid and a sodium alginate aqueous solution according to a certain volume ratio, dripping the hydrous zirconia dispersion liquid and the sodium alginate aqueous solution into a strontium salt solution, stirring to form gel beads, washing with water to remove excessive strontium ions, and obtaining hydrous zirconia/strontium alginate composite gel beads with the particle size of 0.1-5 mm. The gel beads can be used for adsorptive removal of anionic contaminants from water. The Langmuir saturated adsorption capacity of the composite gel beads on phosphate, fluoride and arsenate micro-polluted water can reach 53mg/g, 36mg/g and 61mg/g respectively. The method can solve the separation problem of the hydrous zirconia while ensuring the high adsorption activity of the hydrous zirconia, and has certain potential application value in the field of water purification.
Description
Technical Field
The invention relates to the field of adsorption materials for water quality purification application, and particularly relates to a hydrous zirconia/strontium alginate composite gel bead and a preparation method and application thereof.
Background
With the rapid development of national economy, the environmental pollution problem is increasingly serious. Lakes, rivers, underground water and the like are polluted in large areas and at different degrees, and the health of people is seriously threatened. Phosphate ions, fluoride ions, arsenate ions, and the like are representative anionic contaminants. The problems of water eutrophication, fluorine bone disease, arsenic poisoning and the like can be caused by the high content of the anionic pollutants. At present, the high-concentration polluted water is generally effectively removed by means of chemical precipitation, membrane separation and the like, but for micro-polluted water, the methods are often too high in cost and inconvenient to use.
The adsorption method is an effective method which has simple and convenient operation, small size, flexibility and lower cost and can be used for treating micro-polluted and low-concentration polluted water bodies. The application of adsorption method based on nanometer material to treat micro-polluted water is a research hotspot which is widely concerned at home and abroad at present. The key of the water treatment by the adsorption method is to find and develop a novel adsorption material with high performance. The hydrous zirconia is used as a novel adsorption material, and the adsorption performance of the hydrous zirconia, particularly the adsorption performance of low-concentration phosphate, fluoride and arsenate is far higher than that of other traditional calcium, iron and aluminum-based adsorbents. Yu Su et al (Water Research, 2013, 47, 5018) adsorbed phosphorus in seawater and wastewater using an amorphous zirconium hydroxide which was found to have greater phosphorus adsorption than magnesium aluminum, magnesium iron layered hydroxides. The patent (CN102001722A) discloses a method for preparing zirconia-modified mesoporous silicon material. The patent (CN103495390A) describes a preparation method of a zirconia modified activated carbon adsorbent. Patent (CN102910700A) discloses a method of zirconia modified graphite oxide adsorbent. The physical form of the adsorbent products introduced by the invention patents is a powder state, the sedimentation in sewage is slow, the loaded hydrous zirconia is easy to fall off, and the defects that the hydrous zirconia is difficult to sediment and easy to run off are not fundamentally solved. The adsorbent HZO-201 is prepared by loading hydrated zirconia on polystyrene porous anion exchange resin D-201, and although the problem of separation and recovery of the adsorbent can be well solved, the ion exchange resin is very expensive, the resin is a non-degradable material, and the adsorbent is difficult to treat after being discarded, so that secondary pollution is possible. Patent (CN106693923A) wraps the hydrated lanthanum oxide nanomaterial in aluminum alginate/polyvinyl alcohol, or iron alginate/polyvinyl alcohol gel, and prepares a gel-type adsorbent that can be used for water treatment. However, the gel adsorbent can only be used once, and cannot be regenerated after the adsorption is saturated.
Although the hydrous zirconia has excellent adsorption performance, the application of the hydrous zirconia in the treatment of slightly polluted water is limited by the problem that the hydrous zirconia is difficult to separate and easy to run off.
Disclosure of Invention
The invention aims to provide a hydrous zirconia/strontium alginate composite gel bead aiming at the problems that the existing hydrous zirconia is difficult to separate and easy to run off and the like.
The invention also aims to provide a preparation method of the hydrous zirconia/strontium alginate composite gel beads.
Still another object of the present invention is to provide the use of the above-mentioned hydrous zirconia/strontium alginate composite gel beads.
The invention uses biodegradable strontium alginate gel to wrap and fix the hydrous zirconia to prepare the millimeter-grade gel bead adsorption material. Therefore, the adsorption activity of the hydrous zirconia can be retained to the maximum extent, and the defects that the nano material is difficult to separate and easy to run off can be overcome. In addition, the strontium alginate gel is more salt-resistant and alkali-resistant than the similar calcium alginate gel, thereby realizing desorption in strong alkali high-salt regeneration liquid to obtain regeneration. The strontium alginate gel is a green degradable material, has low price, and does not cause environmental pollution. In view of the advantages, the hydrous zirconia/strontium alginate composite gel bead adsorbent has a wide application prospect in the field of micro-polluted water treatment.
The invention is realized by the following technical scheme:
a preparation method of hydrous zirconia/strontium alginate composite gel beads comprises the following steps:
(1) preparing water-soluble zirconium salt into an aqueous solution, adding an aqueous alkali solution into the aqueous solution under the stirring condition to adjust the pH of the solution to 8-10, hydrolyzing zirconium ions to generate water-insoluble hydrous zirconia precipitate, continuously reacting for 10min, stopping stirring, standing until the white precipitate is complete, pouring out a supernatant, adding water, stirring and diluting to obtain a hydrous zirconia colloidal dispersion;
(2) mixing the hydrous zirconia colloid dispersion liquid prepared in the step (1) with a sodium alginate solution to obtain a gel bead precursor solution;
(3) dissolving strontium salt in water to obtain a strontium salt coagulation bath;
(4) adding the gel bead precursor solution in the step (2) into the strontium salt coagulation bath in the step (3) under the stirring condition, continuously stirring to enable the gel bead to generate a crosslinking reaction, taking out the gel bead after the reaction is finished, washing with water to remove excessive strontium ions, and finally forming gel beads wrapping hydrous zirconia, namely the hydrous zirconia/strontium alginate composite gel beads, wherein the volume ratio of the gel bead precursor solution to the strontium salt coagulation bath is not more than 30% at most, otherwise, the gel beads are easily adhered to each other.
Preferably, the concentration of the water-soluble zirconium salt in the step (1) is 0.01mol/L to 1mol/L in water.
Preferably, the concentration of the alkali solution in the step (1) is 1-10 mol/L.
Preferably, the water-soluble zirconium salt in step (1) is at least one of zirconium acetate, zirconium oxychloride, zirconium tetrachloride and zirconium sulfate.
Preferably, the alkali solution in step (1) is at least one of ammonia water, sodium hydroxide and potassium hydroxide.
Preferably, the concentration of the solution diluted by adding water in the step (1) is 0.01-1.0 mol/L in terms of Zr.
Preferably, the standing time in the step (1) is 5 min.
Preferably, the volume ratio of the hydrous zirconia colloid dispersion liquid in the step (2) to the sodium alginate solution is 0.5-3: 1.
Preferably, the concentration of the sodium alginate solution in the step (2) is 0.5-4 wt%.
Preferably, the concentration of the strontium salt coagulation bath in the step (3) is 0.1-2.0 mol/L.
Preferably, the strontium salt in step (3) is at least one of strontium nitrate, strontium chloride and strontium acetate.
Preferably, the reaction time in the step (4) is 10 min-10 h.
Preferably, the gel bead precursor solution in the step (4) is added into the strontium salt coagulation bath at a speed of 0.02-0.05 mL/s.
The hydrous zirconia/strontium alginate composite gel bead prepared by the preparation method of the nano hydrous zirconia/strontium alginate composite gel bead.
The application of the hydrous zirconia/strontium alginate composite gel beads in removing anionic pollutants in water by adsorption.
Preferably, the anionic contaminant is at least one of fluoride ion, arsenate ion and phosphate ion.
Preferably, the concentration of fluoride ions in the anionic pollutants in the water is 1-5 mg/L, the concentration of arsenate ions is 0.01-1 mg/L, and the concentration of phosphate ions is 0.5-10 mg/L.
Preferably, the application of the hydrous zirconia/strontium alginate composite gel beads in the adsorption removal of anionic pollutants in water comprises the following steps: the method comprises the steps of adding the hydrated zirconia/strontium alginate composite gel beads into water containing anionic pollutants for adsorption, wherein the adding amount of the hydrated zirconia/strontium alginate composite gel beads is 20-100 g/L, the hydraulic retention time is 6 hours, the fluorine ion concentration in the water can be reduced to be below 1mg/L from 5mg/L, the arsenate ion concentration is reduced to be below 0.01mg/L from 0.1mg/L, and the phosphate ion concentration is reduced to be below 0.5mg/L from 10 mg/L.
The regeneration of the hydrous zirconia/strontium alginate composite gel beads after adsorption use comprises the following steps: putting the hydrous zirconia/strontium alginate composite gel beads after adsorption use into a regeneration liquid for soaking for 1-3 h, filtering to remove the regeneration liquid, cleaning with a cleaning liquid to remove the residual regeneration liquid and neutralize the residual alkali, and finally washing with water to complete regeneration, wherein the regeneration liquid is a saturated alkali solution of strontium salt, and the cleaning liquid is a mixed solution of a strontium salt solution and a hydrochloric acid solution.
Preferably, the preparation method of the saturated alkali solution of the strontium salt comprises the following steps: and (3) dropwise adding a strontium salt solution (the concentration of the strontium salt solution is 0.1-2.0 mol/L) into the 5 wt% NaOH solution until turbidity just occurs, wherein the strontium content accounts for 0.1-1 wt% of the system.
Preferably, the strontium salt in the cleaning solution is at least one of strontium nitrate, strontium chloride and strontium acetate.
Preferably, the concentration of the strontium salt in the cleaning solution is 0.01-0.1 mol/L.
Preferably, the concentration of the hydrochloric acid in the cleaning liquid is 0.001-0.01 mol/L.
The hydrous zirconia/strontium alginate composite gel beads are regenerated after being adsorbed and used, and the adsorption capacity after regeneration reaches more than 95% of the initial adsorption capacity.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the high-activity hydrous zirconia is fixed in millimeter-sized gel beads, so that the defects that the nano material is difficult to separate and easy to run off can be overcome;
(2) the hydrous zirconia/strontium alginate composite gel beads are millimeter-sized, gaps among particles are large, filtering resistance is small, separation is easy, and loss of the adsorbent is hardly caused;
(3) after the hydrous zirconia/strontium alginate composite gel beads are adsorbed and saturated, soaking and regenerating through a regenerating solution;
(4) the hydrous zirconia/strontium alginate composite gel beads have strong adsorption capacity, and the Langmuir saturated adsorption capacity of phosphate, fluoride and arsenate micro-polluted water can reach 53mg/g, 36mg/g and 61mg/g respectively.
Drawings
FIG. 1 is a digital photograph of the hydrous zirconia/strontium alginate composite gel beads prepared in example 1.
FIG. 2 is a digital photograph of the hydrous zirconia/strontium alginate composite gel beads prepared in example 2.
FIG. 3 is a digital photograph of the hydrous zirconia/strontium alginate composite gel beads obtained in example 3.
FIG. 4 is a scanning electron microscope photograph of the hydrous zirconia/strontium alginate composite gel beads prepared in example 1, wherein (a) corresponds to the surface of a single gel bead particle, (b), (c) and (d) correspond to the surface topography of the gel bead at different magnifications, respectively, and (e) and (f) correspond to the cross-sectional topography of the gel bead at different magnifications.
FIG. 5 is an X-ray diffraction pattern of the hydrous zirconia/strontium alginate composite gel beads prepared in example 1.
FIG. 6 is the adsorption kinetics curve of the hydrous zirconia/strontium alginate composite gel beads of example 4 for phosphorus adsorption.
FIG. 7 is the adsorption isotherm for phosphorus adsorption from the hydrous zirconia/strontium alginate composite gel beads of example 4.
FIG. 8 is a graph showing the relationship between the removal rate of phosphorus and the number of cycles of the regeneration-adsorption-regeneration performed a plurality of times on the gel beads obtained in the regeneration of example 7.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
A preparation method of hydrous zirconia/strontium alginate composite gel beads comprises the following steps:
(1) 400mL of ZrCl with the concentration of 0.025mol/L is prepared4And (3) dropwise adding 1mol/L NaOH solution into the aqueous solution while stirring until the pH value is 9-10. And (3) continuing the reaction for 10min, stopping stirring, standing for 5min and the like, completely precipitating white precipitates, pouring out supernatant, adding 300mL of deionized water for washing, repeating the water washing for 2 times, fully transferring all precipitates into a 100mL volumetric flask, and fixing the volume to a scale mark to obtain the hydrated zirconia colloid dispersion liquid with the concentration of 0.1 mol/L.
(2) Weighing 4.0g of sodium alginate, and adding water to dissolve to obtain a 2 wt% sodium alginate solution.
(3) And (2) taking 8mL of the sodium alginate solution prepared in the step (2) and 12mL of the hydrous zirconia colloidal dispersion prepared in the step (1), uniformly stirring to obtain a gel bead precursor solution, absorbing the gel bead precursor solution, dropwise adding 200mL of 0.5mol/L strontium chloride solution which is being stirred through a 1mL gun head, controlling the dropwise adding speed to be 0.05mL/s, continuously stirring and reacting for 1h to fully crosslink the gel beads, filtering to remove the residual strontium chloride solution after the crosslinking reaction is finished, adding 200mL of deionized water into a beaker, soaking and slowly stirring for 1h, repeatedly washing for 3-4 times, fully washing the residual strontium chloride ions in the gel bead channel, and thus preparing the hydrous zirconia/strontium alginate composite gel beads with the particle size of 2-4 mm.
The prepared hydrous zirconium oxide/strontium alginate composite gel beads are soaked in deionized water for storage. FIG. 5 is an X-ray diffraction pattern of the hydrous zirconia/strontium alginate composite gel beads prepared in example 1, which can be obtained from FIG. 5: the hydrous zirconia exists in the composite gel beads in an amorphous form.
FIG. 4 is a scanning electron micrograph of the hydrous zirconia/strontium alginate composite gel beads obtained in example 1, wherein (a) corresponds to the surface of a single gel bead particle, (b), (c) and (d) correspond to the surface topography of the gel bead at different magnifications, respectively, (c) the arrows indicate the hydrous zirconia nanoparticles, and (e) and (f) correspond to the cross-sectional topography of the gel bead at different magnifications.
Example 2
A preparation method of hydrous zirconia/strontium alginate composite gel beads comprises the following steps:
(1) 100mL of a 0.1mol/L zirconium acetate aqueous solution was prepared. Dropwise adding 5mol/L NaOH solution under the stirring state until the pH value is 9-10. And (3) continuing the reaction for 10min, stopping stirring, standing for 5min and the like, completely precipitating white precipitates, pouring out supernatant, adding 100mL of deionized water for washing, repeating the water washing for 2 times, fully transferring all the precipitates into a 100mL volumetric flask, and fixing the volume to a scale mark to obtain the hydrated zirconia colloid dispersion liquid with the concentration of 0.1 mol/L.
(2) Weighing 4.0g of sodium alginate, and adding water to dissolve to obtain a 2 wt% sodium alginate solution.
(3) And (3) taking 8mL of the sodium alginate solution prepared in the step (2) and 12mL of the hydrous zirconia colloid dispersion prepared in the step (1), uniformly stirring to obtain a gel bead precursor solution, sucking the gel bead precursor solution, dropwise adding 200mL of 0.25mol/L strontium nitrate solution which is stirring through a 200-microliter gun head, and controlling the dropwise adding speed to be 0.02 mL/s. And continuously stirring for reaction for 1h to fully crosslink the gel beads, filtering to remove the residual solution of strontium nitrate after the crosslinking reaction is finished, adding 200mL of deionized water into a beaker, soaking and slowly stirring for 1h, repeatedly washing for 3-4 times, and fully washing away the residual solution of strontium nitrate in the pore channels of the gel beads, thus preparing the hydrous zirconia/strontium alginate composite gel beads.
The particle size of the composite gel bead product obtained by the method can be reduced to 1-2mm, as shown in the attached figure.
Example 3
A preparation method of hydrous zirconia/strontium alginate composite gel beads comprises the following steps:
(1) 100mL of 0.1mol/L zirconium oxychloride aqueous solution is prepared. Dropwise adding a 28 wt% concentrated ammonia water solution to a pH value of 9-10 under stirring. And (3) continuing the reaction for 10min, stopping stirring, standing for 5min and the like, completely precipitating white precipitates, pouring out supernatant, adding 100mL of deionized water for washing, repeating the water washing for 2 times, fully transferring all the precipitates into a 100mL volumetric flask, and fixing the volume to a scale mark to obtain the hydrated zirconia colloid dispersion liquid with the concentration of 0.1 mol/L.
(2) Weighing 2.0g of sodium alginate, and adding water to dissolve to obtain a 1 wt% sodium alginate solution.
(3) And (3) taking 10mL of the sodium alginate solution prepared in the step (2) and 10mL of the hydrous zirconia colloidal dispersion prepared in the step (1), uniformly stirring to obtain a gel bead precursor solution, sucking the gel bead precursor solution, dropwise adding 200mL of 0.25mol/L strontium chloride solution which is stirring through a 200-mu L gun head, and controlling the dropwise adding speed to be 0.02 mL/s. And continuously stirring for reaction for 1h to fully crosslink the gel beads, filtering to remove the residual solution of strontium chloride after the crosslinking reaction is finished, adding 200mL of deionized water into a beaker, soaking and slowly stirring for 1h, repeatedly washing for 3-4 times, and fully washing away the residual solution of strontium chloride in the pore channels of the gel beads to obtain the hydrous zirconia/strontium alginate composite gel beads with the particle size of 2-3mm, which is shown in figure 3.
Example 4
Application of hydrous zirconia/strontium alginate composite gel beads in removing phosphorus element in water
Simulating slightly polluted water, adopting 10mg/L (calculated by P) of sodium dihydrogen phosphate solution, adding 25ml of the sodium dihydrogen phosphate solution and 1.0g of the zirconium oxide hydrate/strontium alginate composite gel beads prepared in the example 1 into a conical flask, and adsorbing in a constant temperature oscillator for 6 hours at the adsorption temperature of 30 ℃. The concentration of phosphate in water before and after adsorption is measured by an ammonium molybdate spectrophotometry, the removal rate of phosphorus in the solution is calculated to be 97.8%, the content of phosphate is superior to the grade-1A standard (<0.5mg/L) of urban sewage discharge, and the saturated adsorption quantity of Langmuir is 53 mg/g.
Example 5
Application of hydrous zirconia/strontium alginate composite gel beads in removing fluorine element in water
Simulating slightly polluted water, adopting 5mg/L (counted by F) of sodium fluoride solution, adding 25ml of the sodium fluoride solution and 2.0g of the hydrous zirconium oxide/strontium alginate composite gel beads prepared in the example 1 into a conical flask, and adsorbing in a constant temperature oscillator for 6 hours at the adsorption temperature of 30 ℃. The fluorine ion electrode method is used for measuring the concentration of fluorine ions in water before and after adsorption, the removal rate of fluorine in the solution is calculated to be 91.8%, the fluorine content is superior to the national drinking water fluorine content standard (<1.0mg/L), and the Langmuir saturated adsorption amount is 36 mg/g.
Example 6
Application of hydrous zirconia/strontium alginate composite gel beads in removing arsenic element in water
Simulating slightly polluted water, adopting 0.1mg/L (calculated As As) of sodium arsenate solution, adding 25ml of the sodium arsenate solution and 1.0g of the hydrous zirconium oxide/strontium alginate composite gel beads prepared in the example 1 into a conical flask, and adsorbing in a constant temperature oscillator for 6 hours at the adsorption temperature of 30 ℃. The concentration of arsenic ions in water before and after adsorption is measured by an ICP-MS method, the removal rate of arsenic in the solution is calculated to be 93.4%, the content of arsenic in the solution is superior to the national arsenic content standard of drinking water (less than 0.01mg/L), and the Langmuir saturated adsorption amount is 61 mg/g.
Example 7
The regeneration of the hydrous zirconia/strontium alginate composite gel beads after adsorption use comprises the following steps:
(1) soaking the zirconium oxide hydrate/strontium alginate composite gel beads adsorbed with phosphorus in example 4 in 10mL of regeneration liquid for 1.5h, and measuring the concentration of phosphate after desorption, wherein the regeneration liquid is prepared by the following steps: dropwise adding a strontium chloride solution (the concentration of the strontium chloride solution is 0.2mol/L) into a 5 wt% NaOH solution until turbidity just appears, wherein the content of strontium chloride accounts for 0.8 wt% of the system;
(2) after desorption, washing the gel beads with 40mL of water, adding 5mL of mixed solution of strontium chloride and hydrochloric acid, wherein the concentration of the strontium chloride in the mixed solution is 0.05mol/L, the concentration of the hydrochloric acid in the mixed solution is 0.001mol/L, washing to further neutralize residual alkali, washing with 40mL of deionized water, and finishing regeneration of the gel beads.
The gel beads obtained by regeneration in example 7 were repeatedly used by adsorption in accordance with the procedure in example 4, and the regenerated adsorption capacity was 94% of the initial adsorption capacity. The regeneration-adsorption-regeneration cycle was performed a plurality of times, and the removal rate of phosphorus was plotted against the number of cycles as shown in FIG. 8.
The hydrous zirconia/strontium alginate composite gel beads used in the adsorption in examples 5 and 6 were recovered and then regenerated by the same treatment as in example 7, and the regenerated adsorption efficiency was recovered to 97% and 95% of the initial adsorption efficiency, respectively.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The preparation method of the hydrous zirconia/strontium alginate composite gel beads is characterized by comprising the following steps:
(1) preparing water-soluble zirconium salt into an aqueous solution, adding an alkali solution into the aqueous solution under the stirring condition to adjust the pH of the solution to 8-10, reacting for 10min, stopping stirring, standing until white precipitate is completely precipitated, pouring out supernatant, adding water, stirring and diluting to obtain a hydrous zirconia colloidal dispersion liquid;
(2) mixing the hydrous zirconia colloid dispersion liquid prepared in the step (1) with a sodium alginate solution to obtain a gel bead precursor solution;
(3) dissolving strontium salt in water to obtain a strontium salt coagulation bath;
(4) and (3) adding the gel bead precursor solution in the step (2) into the strontium salt coagulation bath in the step (3) under the stirring condition, continuously stirring to enable the gel bead to generate a crosslinking reaction, taking out the gel bead after the reaction is finished, washing with water to remove excessive strontium ions, and finally forming gel beads wrapping hydrous zirconia, namely the hydrous zirconia/strontium alginate composite gel beads, wherein the volume ratio of the gel bead precursor solution to the strontium salt coagulation bath is not more than 30% at most.
2. The method for preparing the hydrous zirconia/strontium alginate composite gel beads according to claim 1, wherein the concentration of the water-soluble zirconium salt in the step (1) is 0.01-1 mol/L; the concentration of the alkali solution in the step (1) is 1-10 mol/L.
3. The method for preparing the hydrous zirconia/strontium alginate composite gel beads according to claim 2, wherein the concentration of the hydrous zirconia/strontium alginate composite gel beads diluted by adding water in the step (1) is 0.01 to 1.0mol/L in terms of Zr.
4. The method for preparing the hydrous zirconia/strontium alginate composite gel beads according to claim 3, wherein the volume ratio of the hydrous zirconia colloidal dispersion liquid to the sodium alginate solution in the step (2) is 0.5-3: 1.
5. The method for preparing hydrous zirconia/strontium alginate composite gel beads according to any one of claims 1 to 4, wherein the concentration of the sodium alginate solution in the step (2) is 0.5 to 4 wt%.
6. The method for preparing hydrous zirconia/strontium alginate composite gel beads according to any one of claims 1 to 4, wherein the concentration of the strontium salt coagulation bath in the step (3) is 0.1 to 2.0 mol/L.
7. The method for preparing hydrous zirconia/strontium alginate composite gel beads according to any one of claims 1 to 4, wherein the gel bead precursor solution in the step (4) is added into the strontium salt coagulation bath at a speed of 0.02-0.05 mL/s, and the reaction time in the step (4) is 10 min-10 h.
8. The method for preparing hydrous zirconium oxide/strontium alginate composite gel beads according to any one of claims 1 to 4, wherein the water-soluble zirconium salt in the step (1) is at least one of zirconium acetate, zirconium oxychloride, zirconium tetrachloride and zirconium sulfate; the alkali solution in the step (1) is at least one of ammonia water, sodium hydroxide and potassium hydroxide; and (3) the strontium salt is at least one of strontium nitrate, strontium chloride and strontium acetate.
9. The hydrous zirconia/strontium alginate composite gel beads prepared by the method for preparing the hydrous zirconia/strontium alginate composite gel beads as claimed in any one of claims 1 to 8.
10. Use of the hydrous zirconia/strontium alginate composite gel beads of claim 9 for the adsorptive removal of anionic contaminants from water.
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| 复合纳米吸附剂的制备及污水磷回收性能;黄宣旗;《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》;20210315(第03期);B016-324 * |
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