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Preparation method and application of composite hydrogel provided with amide group and hydroxyl group and loaded with nano manganese oxide hydrate

A technology of composite hydrogel and hydrated manganese oxide, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of complex synthesis route, low purity of polymer hydrogel, etc. Good absorption, good mechanical strength, large specific surface area

Inactive Publication Date: 2015-01-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing artificially synthesized polymer hydrogel has one or more functional groups such as amino, hydroxyl, carboxyl, and sulfonic acid groups, which have a certain effect on the removal of heavy metal ions, but most of the existing artificial synthesis methods synthesize The way is complicated, need to add cross-linking agent, initiator, the purity of the obtained polymer hydrogel is not high, the high-energy ray irradiation polymerization method does not need to add other substances, and the method is relatively clean

Method used

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  • Preparation method and application of composite hydrogel provided with amide group and hydroxyl group and loaded with nano manganese oxide hydrate
  • Preparation method and application of composite hydrogel provided with amide group and hydroxyl group and loaded with nano manganese oxide hydrate
  • Preparation method and application of composite hydrogel provided with amide group and hydroxyl group and loaded with nano manganese oxide hydrate

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Experimental program
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Effect test

Embodiment 1

[0036] 1. Weigh a certain mass of N-methylolacrylamide monomer and dissolve it in deionized water as component A, then add a certain amount of 2-hydroxyethyl acrylate to the above solution as component B, distilled water as component Divide into C, mix according to (A+B):C is 1:1 (V / V), where A:B is 1:9 (mol / mol); ultrasonic 30min to mix the solution evenly, fill the mixed solution with N 2 to ensure anaerobic conditions.

[0037] 2. Radiation polymerization process: by directly adding refrigerant, at -78°C, using 60 Co-γ high-energy rays, the radiation dose is controlled to 1×10 5 Gy.

[0038] 3. In-situ loading of nano-hydrated manganese oxide: Weigh 0.5g of xerogel into a 100ml Erlenmeyer flask, add 50ml of 0.204mol / l MnSO 4 .H 2 O solution, placed in a constant temperature shaker for 24h, filtered out the hydrogel, dried at room temperature, and then placed in 50ml of 0.138mol / l KMnO 4 The solution was shaken for 24h. The formation of HMO was indicated when the color...

Embodiment 2

[0041] (A+B): C is 1:2 (V / V), monomer solution ratio: A: B is 3:7 (mol / mol);

[0042] Radiation polymerization process: at a temperature of -78°C, using 60 Co-γ high-energy rays, the radiation dose is controlled to 1×10 5 Gy;

[0043] MnSO used 4 .H 2 The concentration of O solution is 0.068mol / l, the KMnO used 4 The concentration of the solution is 0.046mol / l;

[0044] Composite hydrogel for six metal ions Cr 3+ 、Cd 2+ 、Ni 2+ , Zn 2+ 、Cu 2+ , Pb 2+ The adsorption capacities are 140mg / g, 70mg / g, 30mg / g, 70mg / g, 50mg / g, 130mg / g respectively. Due to the loading of nanometer hydrated manganese oxide, the mechanical strength of the hydrogel is greatly enhanced, the service life is long, and the adsorption effect is also enhanced.

Embodiment 3

[0046] (A+B): C is 1:1 (V / V), monomer solution ratio: A: B is 1:1 (mol / mol);

[0047] Radiation polymerization process: at a temperature of -63°C, using 137 Cs-γ high-energy rays, the control radiation dose is 1×10 4 Gy;

[0048] MnSO used 4 .H 2 The concentration of O solution is 0.204mol / l, the KMnO used 4 The concentration of the solution is 0.138mol / l;

[0049] Composite hydrogel for six metal ions Cr 3+ 、Cd 2+ 、Ni 2+ , Zn 2+ 、Cu 2+ , Pb 2+ The adsorption capacities are 120mg / g, 55mg / g, 20mg / g, 60mg / g, 40mg / g, 110mg / g respectively. Due to the loading of nanometer hydrated manganese oxide, the mechanical strength of the hydrogel is greatly enhanced, the service life is long, and the adsorption effect is also enhanced.

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Abstract

The invention relates to a preparation method and an application of composite hydrogel provided with an amide group and a hydroxyl group and loaded with nano manganese oxide hydrate. The preparation method comprises the following steps: uniformly mixing 2-hydroxyethyl acrylate, N-hydroxymethyl acrylamide and distilled water to obtain polymer hydrogel by virtue of radiation polymerization; by taking the polymer hydrogel as a template, loading nano manganese oxide hydrate in situ, wherein a molar ratio of 2-hydroxyethyl acrylate to the N-hydroxymethyl acrylamide monomer is (1-9) to (9-1), a polymerization temperature is (-)63 DEG C-(-)95 DEG C, the irradiation polymerization is performed by an aqueous solution of 2-hydroxyethyl acrylate and N-hydroxymethyl acrylamide in the presence of a protective gas, and a method for loading nano manganese oxide hydrate is an oxidization reduction reaction in-situ precipitation method. The composite hydrogel is applied to adsorbing heavy metal ions in wastewater, and capable of effectively removing heavy metals; and moreover, the composite hydrogel has relatively high mechanical strength and a long service life.

Description

technical field [0001] The invention relates to a preparation method of a composite hydrogel with amide groups and hydroxyl groups and loaded with nanometer hydrated manganese oxide and its application in water treatment. Background technique [0002] Heavy metal pollution mainly refers to environmental pollution caused by heavy metals with significant biological toxicity such as mercury, cadmium, lead, chromium, and metalloid arsenic. Heavy metals interact strongly with proteins and various enzymes in the human body, making them inactive and causing serious harm to the human body. Heavy metals are also harmful to plants. The migration of heavy metals in the soil-plant system directly affects the physiology, biochemistry, growth and development of plants. Animals eating plants contaminated by heavy metals will accumulate along the food chain and eventually affect human health. Heavy metals are widely distributed in the atmosphere, water, soil, and organisms, and heavy meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/28C08F2/46C08J3/075C08K3/22C08L33/24C02F1/28C02F1/62
Inventor 李正魁朱倩王晶晶韩华杨张万广
Owner NANJING UNIV
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