NL2032422B1 - Preparation method of composite gel for adsorbing heavy metals - Google Patents
Preparation method of composite gel for adsorbing heavy metals Download PDFInfo
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- NL2032422B1 NL2032422B1 NL2032422A NL2032422A NL2032422B1 NL 2032422 B1 NL2032422 B1 NL 2032422B1 NL 2032422 A NL2032422 A NL 2032422A NL 2032422 A NL2032422 A NL 2032422A NL 2032422 B1 NL2032422 B1 NL 2032422B1
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- composite gel
- gel
- preparing
- sodium alginate
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 38
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000000919 ceramic Substances 0.000 claims abstract description 24
- 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 22
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 22
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 22
- 239000000661 sodium alginate Substances 0.000 claims abstract description 22
- 239000002086 nanomaterial Substances 0.000 claims abstract description 20
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- -1 polyoxyethylene Polymers 0.000 claims abstract description 14
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- OVARTBFNCCXQKS-UHFFFAOYSA-N propan-2-one;hydrate Chemical compound O.CC(C)=O OVARTBFNCCXQKS-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 238000001179 sorption measurement Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 6
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 6
- 239000012498 ultrapure water Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 239000011575 calcium Substances 0.000 claims 1
- 238000007654 immersion Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 6
- 238000002791 soaking Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 30
- 150000002500 ions Chemical class 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000003463 adsorbent Substances 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 231100000419 toxicity Toxicity 0.000 description 4
- 230000001988 toxicity Effects 0.000 description 4
- 229920001661 Chitosan Polymers 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 235000012571 Ficus glomerata Nutrition 0.000 description 2
- 240000000365 Ficus racemosa Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 235000015125 Sterculia urens Nutrition 0.000 description 2
- BQOJVQYLMGADDA-UHFFFAOYSA-N calcium;dinitrate;trihydrate Chemical compound O.O.O.[Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O BQOJVQYLMGADDA-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 210000004185 liver Anatomy 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 description 1
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- 206010003445 Ascites Diseases 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 208000019425 cirrhosis of liver Diseases 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 210000000232 gallbladder Anatomy 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000012633 leachable Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The present disclosure belongs to field of heavy metal pollution control, and particularly relates to a composite gel for adsorbing heavy metals and a preparation method thereof. The composite gel is prepared by using sodium alginate, polyoxyethylene and a porous ceramic nanomaterial as main raw materials. The present disclosure further relates to a method for preparing the composite gel, comprising the following steps: a) uniformly mixing sodium alginate, polyoxyethylene and a porous ceramic nanomaterial, and then dissolving in water to obtain solution A; b) adding dropwise the solution A to a calcium nitrate solution, uniformly stirring and allowing to stand to form a gel; c) soaking the gel obtained in the step b) in an acetone—water solution, and taking out after soaking for 24—36 h to obtain the composite gel.
Description
P1454 /NLpd
PREPARATION METHOD OF COMPOSITE GEL FOR ADSORBING HEAVY METALS
The present disclosure belongs to the field of heavy metal pollution control, and particularly relates to a composite gel for adsorbing heavy metals and a preparation method thereof.
Heavy metal wastewater mainly comes from mining, smelting and chemical industries. Heavy metal ions are significantly toxic to animals, plants and microorganisms, and are not easily decomposed.
They are easy to accumulate in the body and produce toxicity, and are currently one of the most harmful pollutants. For example, although copper is an essential trace element for the human body, when a large amount of heavy metal ion copper remains in the human body, it is very easy to burden the organs in the body, especially the liver and gallbladder. When the two organs have problems, me- tabolism in the human body will become disordered, and liver cir- rhosis, liver ascites and even more serious conditions will occur.
The removal methods of heavy metal wastewater mainly include adsorption method, chemical method, biological method, among which the adsorption method is widely used because of its quick effect, good effect and low cost.
Adsorbents play an important role in the removal of heavy metals in wastewater by adsorption, and the different properties of adsorbents determine the different types of heavy metal ions to be adsorbed. Commonly used adsorbents mainly include activated carbon, biomass raw materials, mineral raw materials, etc., but due to the low content of heavy metals adsorbed by these adsorbent materials and the complicated preparation process, it is necessary to propose an efficient, fast and easily degradable absorbent ma- terial for heavy metals.
In the article titled "Study on the adsorption of copper ions by epichlorohydrin cross-linked chitosan/sodium alginate” (Yuan
Yihua et al., Journal of South China University of Technology
(Natural Science Edition), 2012, 40(7): 148-154), chitosan and so- dium alginate are combined by etherification with epoxy chloropro- pane as a cross-linking agent. Through modification, the good me- chanical properties of sodium alginate can enhance the floccula- tion ability of chitosan, and the modified polymer flocculant has good adsorption to Cu‘ in the water phase. However, in the face of increasingly serious heavy metal pollution, the effect of this ad- sorbent is also slightly "incapable. Therefore, it is urgent to have an adsorbent with better adsorption performance and higher heavy metal removal rate to get rid of this dilemma.
An object of the present disclosure is to provide a composite gel for adsorbing heavy metals; the composite gel has quick ef- fect, high removal rate of heavy metals, and cannot cause second- ary pollution.
In order to achieve the above object, the technical solution adopted in the present disclosure is as follows: a composite gel for adsorbing heavy metals is prepared by using sodium alginate, polyoxyethylene and a porous ceramic nanomaterial as main raw ma- terials.
The porous ceramic nanomaterial has a specific surface area of 180-900 mè:gt and a median pore diameter of 28 nm. The func- tional groups of the porous ceramic nanomaterial can effectively adsorb and fix heavy metal ions, and the physical stability is high. The main components of porous ceramic nanomaterial include silica and silicate; organic and inorganic monomolecules are grafted on the surface of porous ceramics; and the monomolecular layers of different organic functions are covalently bonded onto the surface of the ceramic pores to realize modification, thus the porous ceramic particles have targeted bonding ability and can be combined with the heavy metal ions with high activity to form a stable form, that is, the transformation of heavy metal elements from a high activity form to an activity form is promoted, thereby reducing the bicavailability and migration of the heavy metals and achieving the purpose of heavy metal passivation. Especially, the porous ceramic nanomaterial cannot produce leachables in the pro-
cess of adsorbing the heavy metals, so that secondary pollution can be avoided.
The single porous ceramic nanomaterial cannot be uniformly mixed with water, but can be mixed with sodium alginate and poly- oxyethylene and then the mixture is added to water; after the three components are dissolved, the porous ceramic nanomaterial can be dissolved with sodium alginate and polyoxyethylene in wa- ter, and the mixed solution is dark brown and viscous. It should be noted that this similar dissclution state does not affect the porous structure and adsorption performance of the porous ceramic nanomaterial, the porous ceramic nanomaterial synergizes with so- dium alginate-polyoxzyethylene to greatly improve the adsorbing performance of the composite gel to the heavy metal ions.
The composite gel for adsorbing the heavy metals of the pre- sent disclosure is easily available in raw materials, high in re- moval rate of heavy metals, quick to effect, free of biological toxicity, easy to degrade, and free of pollution to the environ- ment.
Another object of the present disclosure is to provide a method for preparing the composite gel for adsorbing the heavy metals, the method is simple and easy to operate, easily available in raw materials, stable in product performance, free of biologi- cal toxicity and easy to realize degradation.
In order to achieve the above object, the technical solution adopted in the present disclosure is as follows: a method for pre- paring the composite gel for adsorbing the heavy metals comprises the following steps: a) uniformly mixing sodium alginate, polyoxyethylene and a porous ceramic nanomaterial, and then dissolving in water to ob- tain solution A; b) adding dropwise the solution A to a calcium nitrate solu- tion, uniformly stirring and allowing to stand to form a gel; c) soaking the gel obtained in the step b) in an acetone- water solution, and taking out after soaking for 24-36 h to obtain the composite gel.
In the above solution, sodium alginate with free carboxyl groups can react with the heavy metals, but due to poor mechanical strength, sodium alginate is easily decomposed by microorganisms in water; polyoxyethylene with high strength and corrosion re- sistance can make up for the shortcomings of sodium alginate; in addition, the porous ceramic nancmaterial with a large specific surface area can effectively adsorb the heavy metal ions. Sodium alginate and the ceramic nanomaterial can be combined, and polyox- yethylene, sodium alginate and the ceramic nanomaterial can syner- gize each other, which further enhances the adsorption to the heavy metal ions, and moreover, the mixture can be in a form of adsorbent gel, thus strong mechanical performance and fast adsorp- tion efficiency are achieved. The gel can be directly taken out after adsorbing, which has more obvious advantages compared with powdered adsorbents, and the composite gel has no biological tox- icity, is easy to degrade, and has no pollution to the environ- ment.
As a preferred embodiment, in the step a), the mass ratio of sodium alginate to polyoxyethylene to the porous ceramic nano- material is 2: (0.9-1.1): (1-4), more preferably, 2: 1: 4. Under the synergistic effect of the three raw materials, the adsorption effect of the composite gel can be improved, and good mechanical performance is ensured. In order to avoid other impurities affect- ing the adsorption performance of the composite gel in the pro- cess, the water used is ultrapure water, and the sodium alginate content in the solution A after adding ultrapure water is 2%-3%.
Preferably, in order to form the stable gel, in the step b), the concentration of the calcium nitrate solution is 0.2-0.5 mol/L, and the volume of the calcium nitrate solution is 4-6 times the volume of the solution A; the solution A is added dropwise to the calcium nitrate solution and uniformly mixed, and then the mixture allowed to standing for 12-18 h at 5-40°C.
Further preferably, in the step c), the gel is soaked in a 4% acetone-water solution for 24 h. After being formed, the gel is soaked in an acetone-water solution to dissolve more soluble impu- rities in the gel, such as nitrate ions taken in by the calcium nitrate solution.
FIG. 1 is a SEM image of a composite gel obtained in the em- bodiment before adsorbing Cu’;
FIG. 2 is a SEM image of a composite gel obtained in the em- 5 bodiment after adsorbing Cu*.
The technical solutions of the present disclosure will be further described in detail below in conjunction with the embodi- ments.
Preparation: 5 g of sodium alginate, 2.5 g of polyoxyethylene and 10 g of a ceramic nanomaterial were uniformly mixed; 200 ml of ultrapure water was added and stirred until sodium alginate and polyoxyethylene were completely dissolved to obtain a solution A; the solution A was added dropwise to 1 L of calcium nitrate trihy- drate solution with a concentration of 0.3 mol/L and uniformly mixed; the mixture was allowed to standing at a temperature of 20°C for 12 h to form a stable gel; the gel was soaked in 4% ace- tone-water solution for 24 h and then taken out to obtain a compo- site gel for adsorbing heavy metals.
Detection: 4 ml of the composite gel was placed into a trian- gular flask; 50 ml of Cu®” solution with a concentration of 50 mg/L was added; the triangular flask was firstly placed in a constant- temperature shaking box with a temperature of 25°C and a rotating speed of 150 r/min for shaking for 180 min; then the triangular flask was placed in a centrifuge at a speed of 3,000 r/min for centrifuging for 10 min; and an inductively-coupled plasma emis- sion spectrometer was used for measuring the concentration of cu” in the solution after treatment; and the removal rate of cu‘ was 94.94% by calculating after using the above composite gel to ad- sorb the heavy metal ions in the solution.
Comparative Example
Preparation: 5 g of sodium alginate, 2.5 g of polyoxyethylene were uniformly mixed; 200 ml of ultrapure water was added and stirred until completely dissolved to obtain a solution A; the so- lution A was added dropwise to calcium nitrate trihydrate solution with a concentration of 0.3 mol/L and uniformly mixed; the mixture was allowed to standing at a temperature of 20°C for 12 h to form a stable gel; the gel was soaked in 4% acetone-water solution for 24 h and then taken out to obtain a composite gel for adsorbing heavy metals.
Detection: 4 ml of the composite gel was placed into a trian- gular flask; 50 ml of Cu? solution with a concentration of 50 mg/L was added; the triangular flask was firstly placed in a constant- temperature shaking box with a temperature of 25°C and a rotating speed of 150 r/min for shaking for 180 min; then the triangular flask was placed in a centrifuge at a speed of 3,000 r/min for centrifuging for 10 min; and an inductively-coupled plasma emis- sion spectrometer was used for measuring the concentration of cu* in the solution after treatment; and the removal rate of cu“ was 36.8% by calculating after using the above composite gel to adsorb the heavy metal ions in the solution.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2032422A NL2032422B1 (en) | 2022-07-07 | 2022-07-07 | Preparation method of composite gel for adsorbing heavy metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2032422A NL2032422B1 (en) | 2022-07-07 | 2022-07-07 | Preparation method of composite gel for adsorbing heavy metals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2032422B1 true NL2032422B1 (en) | 2024-01-23 |
Family
ID=89621199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| NL2032422A NL2032422B1 (en) | 2022-07-07 | 2022-07-07 | Preparation method of composite gel for adsorbing heavy metals |
Country Status (1)
| Country | Link |
|---|---|
| NL (1) | NL2032422B1 (en) |
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- 2022-07-07 NL NL2032422A patent/NL2032422B1/en active
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