CN115739038A - Method for treating phosphorus-containing wastewater by utilizing lanthanum-functionalized silica aerogel microsphere composite material - Google Patents
Method for treating phosphorus-containing wastewater by utilizing lanthanum-functionalized silica aerogel microsphere composite material Download PDFInfo
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- CN115739038A CN115739038A CN202111023718.9A CN202111023718A CN115739038A CN 115739038 A CN115739038 A CN 115739038A CN 202111023718 A CN202111023718 A CN 202111023718A CN 115739038 A CN115739038 A CN 115739038A
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- lanthanum
- sodium alginate
- polyvinyl alcohol
- silica aerogel
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000004005 microsphere Substances 0.000 title claims abstract description 50
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 239000004965 Silica aerogel Substances 0.000 title claims abstract description 33
- 239000011574 phosphorus Substances 0.000 title claims abstract description 33
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002351 wastewater Substances 0.000 title claims abstract description 15
- 239000000661 sodium alginate Substances 0.000 claims abstract description 66
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 66
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 63
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 63
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 52
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000011259 mixed solution Substances 0.000 claims abstract description 44
- 239000004964 aerogel Substances 0.000 claims abstract description 43
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims abstract description 27
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 23
- 238000004132 cross linking Methods 0.000 claims abstract description 18
- 238000001179 sorption measurement Methods 0.000 claims abstract description 17
- 238000004108 freeze drying Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 6
- 230000007613 environmental effect Effects 0.000 claims abstract description 3
- 238000011084 recovery Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 48
- 239000008367 deionised water Substances 0.000 claims description 28
- 229910021641 deionized water Inorganic materials 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 28
- 238000005406 washing Methods 0.000 claims description 28
- 229910021645 metal ion Inorganic materials 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 4
- ARWMTMANOCYRLU-UHFFFAOYSA-N [Ca].[La] Chemical compound [Ca].[La] ARWMTMANOCYRLU-UHFFFAOYSA-N 0.000 claims description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 3
- 239000003431 cross linking reagent Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 29
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 29
- 239000001110 calcium chloride Substances 0.000 abstract description 11
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 11
- -1 lanthanum ions Chemical class 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003463 adsorbent Substances 0.000 description 3
- 238000009388 chemical precipitation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 241000512259 Ascophyllum nodosum Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 241000199919 Phaeophyceae Species 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000007783 nanoporous material Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003170 water-soluble synthetic polymer Polymers 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a preparation method of a method for treating phosphorus-containing wastewater by utilizing a lanthanum-functionalized silica aerogel microsphere composite material, belonging to the field of adsorption materials. The preparation method is characterized in that a mixed solution of sodium alginate/polyvinyl alcohol and silica aerogel microsphere is dripped into a mixed solution of lanthanum chloride and calcium chloride for crosslinking, and finally, the lanthanum-functionalized silica aerogel microsphere composite material is prepared by freeze drying. The invention aims to prepare a novel phosphorus removal adsorption material aiming at the problems commonly existing in the phosphorus-containing wastewater treatment technology at present. By adding the silicon dioxide aerogel microspheres and lanthanum ions in the preparation of the material, the method realizes simple operation, safety, environmental protection, low cost and high-efficiency removal of phosphorus in wastewater. The adsorption is convenient for recovery, and no secondary pollution is caused to the water body. Has application prospect.
Description
Technical Field
The invention belongs to the technical field of adsorption materials, and particularly relates to a preparation method of a lanthanum-functionalized silica aerogel microsphere composite material and application of the lanthanum-functionalized silica aerogel microsphere composite material in treatment of phosphorus-containing wastewater.
Background
Phosphorus is one of important nutrient substances in aquatic ecosystems, however, excessive discharge of phosphorus into water bodies can cause occurrence of harmful algal blooms, namely eutrophication, and seriously deteriorate aquatic ecology. At present, the problem of phosphorus pollution is very serious, and the problem of water eutrophication caused by phosphorus pollution is urgently solved. At the same time, phosphorus is a non-renewable resource and eventually becomes depleted. Therefore, the method effectively removes and recovers the phosphorus in the water, and has important significance for the reutilization and sustainable development of the environment. The primary standard of phosphate (counted by P) specified in the 'comprehensive wastewater discharge standard' of China is less than or equal to 0.5 mg/L, and the secondary standard is less than or equal to 1 mg/L, however, due to the limitations of treatment technology and economic cost of a sewage treatment plant, the situation that phosphorus-containing wastewater pollutes natural water bodies is difficult to relieve even if the primary standard is executed, and the problem of phosphorus pollution in the water bodies becomes a primary task for improving water environments at present.
At present, the phosphorus removal methods for water bodies mainly comprise a chemical precipitation method, a bioremediation method, an adsorption method and the like, and although the methods can achieve a certain phosphorus removal effect, certain defects also occur in the operation process. The traditional chemical precipitation method needs a large amount of chemical agents as assistance, and secondary pollution is easy to occur. Although environmentally friendly, traditional biological methods have high requirements for wastewater biodegradability and limited treatment capacity. The adsorption method has the advantages of high adsorption rate, good phosphorus removal effect and easy recovery of the adsorption medium/carrier, and once the problem of the preparation cost of the adsorption material is solved, the adsorption method is a phosphorus removal means with great potential.
Sodium alginate is mainly present in brown algae such as kelp or gulfweed, and is polysaccharide carbohydrate. The sodium alginate has better gel property, biocompatibility and degradability, and the unique properties enable the alginic acid and the sodium alginate to be widely applied in a plurality of fields. However, sodium alginate has a disadvantage of low mechanical strength, which makes it a bottleneck as an immobilization carrier. Polyvinyl alcohol is a cheap and nontoxic water-soluble synthetic polymer, has strong mechanical property and good biocompatibility, is widely used for a carrier for fixing microorganisms, and is also used for fixing powdery adsorbents in a plurality of researches to prepare granules for treating various kinds of wastewater. Silica aerogel microspheres are a nanoporous material with a high specific surface area. In addition, lanthanum, which is a rare earth element, has the advantages of good affinity and fast adsorption rate for phosphorus adsorption, and is widely used in phosphorus removal adsorbents. Sodium alginate and polyvinyl alcohol are used as cross-linking carriers, silicon dioxide aerogel microspheres are coated, and the cross-linking is carried out with lanthanum ions, so that the lanthanum-functionalized silicon dioxide aerogel microsphere composite material which is simple in process and environment-friendly is prepared as a phosphorus removal adsorbent, the price is low, the high-efficiency removal of phosphorus-containing wastewater can be realized on the basis of simple preparation process, and the harmless treatment of the phosphorus-containing wastewater is realized.
Disclosure of Invention
The invention aims to prepare a novel phosphorus removal adsorption material aiming at the problems commonly existing in the phosphorus-containing wastewater treatment technology at present. By adding the silicon dioxide aerogel microspheres and lanthanum ions in the preparation of the material, the method realizes simple operation, safety, environmental protection, low cost and high-efficiency removal of phosphorus in wastewater. The adsorption is convenient to recover, and secondary pollution to the water body is avoided.
The purpose of the invention is realized by the following technical scheme:
1) Respectively weighing silica aerogel microspheres, sodium alginate and polyvinyl alcohol according to a certain mass ratio for later use, preparing into a solution, heating and stirring at 95 ℃ for 30 minutes to completely dissolve the solution;
2) Adding a certain amount of weighed silica aerogel microspheres into the prepared sodium alginate/polyvinyl alcohol solution, stirring for 15-20 minutes, and uniformly mixing to obtain a silica aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution;
3) Weighing lanthanum chloride and anhydrous calcium chloride according to a certain lanthanum-calcium mass ratio for later use, adding deionized water to prepare a 3-7% mixed ionic solution, and acting as a cross-linking agent for later use;
4) Dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls;
5) Repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material, wherein the diameter of the particles is about 2-4 mm;
6) The microspheres prepared under the conditions of different mass ratios are added into simulated phosphorus-containing wastewater, and an adsorption reaction is carried out in a water bath constant-temperature oscillation box under the reaction conditions that: the adding amount of the microspheres is 1.5g/L, the initial phosphorus concentration is 50mg/L, the initial pH is 6-7, the reaction temperature is 25 ℃, and the rotation speed of an oscillator is 180rpm. And (4) after the reaction is balanced, measuring the concentration of the residual phosphorus in the solution.
7) After the reaction was completed, a sample was taken out by a disposable syringe, and after filtering the sample by using a 0.45 μm cellulose acetate filter, the phosphorus concentration was measured by a spectrophotometric method.
Preferably, the mass ratio of the silica aerogel microspheres to the sodium alginate/polyvinyl alcohol mixed solution is sodium alginate/polyvinyl alcohol: aerogel = 1;
preferably, the concentration of the lanthanum calcium mixed ion solution is 7 percent;
preferably, the ratio of lanthanum to calcium is 4;1;
preferably, the crosslinking time is 10 hours.
Preferably, the amount is 1.5g/L.
Detailed Description
Example 1:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 3.5g of anhydrous calcium chloride and 1.5g of lanthanum chloride in 100ml of water to obtain a 5% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 2:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 2.5g of anhydrous calcium chloride and 2.5g of lanthanum chloride in 100ml of water to obtain a 5% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing the composite material by using deionized water for 3-4 times, washing off metal ions which are not crosslinked on the surface, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 3:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 1g of anhydrous calcium chloride and 4g of lanthanum chloride in 100ml of water to obtain a 5% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 4:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 2g of anhydrous calcium chloride and 3g of lanthanum chloride in 100ml of water to obtain a 5% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 5:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 3g of anhydrous calcium chloride and 2g of lanthanum chloride in 100ml of water to obtain a 5% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing the composite material by using deionized water for 3-4 times, washing off metal ions which are not crosslinked on the surface, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 6:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 5g of lanthanum chloride in 100ml of water to obtain a 5% lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 7:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 4.9g of anhydrous calcium chloride and 2.1g of lanthanum chloride in 100ml of water to obtain a 7% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing the composite material by using deionized water for 3-4 times, washing off metal ions which are not crosslinked on the surface, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 8:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 3.5g of anhydrous calcium chloride and 3.5g of lanthanum chloride in 100ml of water to obtain a 7% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 9:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 1.4g of anhydrous calcium chloride and 5.6g of lanthanum chloride in 100ml of water to obtain a 7% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 10:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 2.8g of anhydrous calcium chloride and 4.2g of lanthanum chloride in 100ml of water to obtain a 7% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing the composite material by using deionized water for 3-4 times, washing off metal ions which are not crosslinked on the surface, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 11:
dissolving 0.6g of sodium alginate and polyvinyl alcohol in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 4.2g of anhydrous calcium chloride and 2.8g of lanthanum chloride in 100ml of water to obtain a 7% calcium chloride and lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
Example 12:
dissolving 0.6g of sodium alginate and polyvinyl alcohol v in 30ml of deionized water, and stirring for 30min at 95 ℃ until the sodium alginate and the polyvinyl alcohol v are completely dissolved to obtain a 2wt% solution; adding 1.8g of aerogel into the solution, stirring for 15min, and uniformly mixing to obtain a silicon dioxide aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution; dissolving 7g of lanthanum chloride in 100ml of water to obtain a 7% lanthanum chloride mixed solution; dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls; and repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum-functionalized silicon dioxide aerogel microsphere composite material.
The present invention is not limited to the above embodiments.
Claims (3)
1. A method for treating phosphorus-containing wastewater by using a lanthanum-functionalized silica aerogel microsphere composite material comprises the following specific steps:
1) Respectively weighing silica aerogel microspheres, sodium alginate and polyvinyl alcohol according to a certain mass ratio for later use, preparing into a solution, heating and stirring at 95 ℃ for 30 minutes to completely dissolve the solution;
2) Adding a certain amount of weighed silica aerogel microspheres into the prepared sodium alginate/polyvinyl alcohol solution, stirring for 15-20 minutes, and uniformly mixing to obtain a silica aerogel microsphere-sodium alginate/polyvinyl alcohol mixed solution;
3) Weighing lanthanum chloride and anhydrous calcium chloride according to a certain lanthanum-calcium mass ratio for later use, adding deionized water to prepare a 3-7% mixed ionic solution, and acting as a cross-linking agent for later use;
4) Dropwise adding the mixed solution of the silica aerogel microspheres and sodium alginate/polyvinyl alcohol into the mixed ionic solution obtained in the step 3) at a constant speed by using an injector with a needle head aperture of 1-3mm, and crosslinking for 6-8h to form balls;
5) Repeatedly washing with deionized water for 3-4 times, washing off metal ions with uncrosslinked surfaces, and freeze-drying to obtain the lanthanum functionalized silica aerogel microsphere composite material, wherein the diameter of the particles is about 2-4 mm.
2. The preparation method of the lanthanum-functionalized silica aerogel microsphere composite material according to claim 1, characterized by comprising the following steps: the mass ratio of the silica aerogel microspheres to the sodium alginate/polyvinyl alcohol mixed solution is sodium alginate/polyvinyl alcohol: aerogel = 1.
3. The adsorption material prepared according to claim 1, characterized by safety, environmental protection, low cost, removal of phosphorus in wastewater, convenient recovery after adsorption, and no secondary pollution to water.
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| CN116786092A (en) * | 2023-07-13 | 2023-09-22 | 北京师范大学 | Organic polymer supported La@Fe-SiO 2 Aerogel microsphere and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116786092A (en) * | 2023-07-13 | 2023-09-22 | 北京师范大学 | Organic polymer supported La@Fe-SiO 2 Aerogel microsphere and preparation method and application thereof |
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