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Sulfydryl-containing magnetic hydrogel and method and application for sulfydryl-containing magnetic hydrogel

A technology of hydrogel and magnetic water, which is applied in the field of adsorption materials, can solve the problems of complex synthesis methods, affecting the removal effect of heavy metals, and low purity of polymer hydrogels, and achieves low production costs, enhanced mechanical strength, and long service life Effect

Inactive Publication Date: 2014-12-31
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing artificially synthesized polymer hydrogel has one or several functional groups such as amino, carboxyl, hydroxyl, and mercapto groups, which have a certain effect on the removal of heavy metal ions, but most of the existing artificial synthesis methods have complex synthesis routes. , need to add cross-linking agent, initiator, use organic solvent, the purity of the obtained polymer hydrogel is not high, which affects the removal effect of heavy metals, and the recovery of hydrogel after adsorption is also a problem to be solved

Method used

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  • Sulfydryl-containing magnetic hydrogel and method and application for sulfydryl-containing magnetic hydrogel
  • Sulfydryl-containing magnetic hydrogel and method and application for sulfydryl-containing magnetic hydrogel
  • Sulfydryl-containing magnetic hydrogel and method and application for sulfydryl-containing magnetic hydrogel

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Embodiment 1

[0031]1. Weigh a certain mass of cysteine ​​monomer and dissolve it in deionized water as component A, then add a certain amount of hydroxyethyl acrylate monomer to the above solution as component B, distilled water as component C, press ( A+B): C is 1:4 (v / v) for mixing, where A:B is 1:9 (mol / mol); ultrasonic 20min to mix the solution evenly, and fill the mixed solution with N 2 to ensure anaerobic conditions.

[0032] 2. At a temperature of -63°C, use 60 Co-γ-ray irradiation polymerization, the radiation dose is 1×10 4 Gy: The polymer hydrogel formed by radiation was cut into small pieces of 1cm×1cm×1cm, washed in the Erlenmeyer flask several times, and dried at 40°C for later use.

[0033] 3. Weigh 0.5g of xerogel into a three-neck bottle, add 300ml of distilled water, and bubble nitrogen for 30min to remove oxygen; weigh 2.1g of FeCl 2 .4H 2 O and 5.8gFeCl 3 .6H 2 Dissolve O in 10ml of distilled water and add them to three-neck flasks respectively, slowly add 30% amm...

Embodiment 2

[0036] 1. Weigh a certain mass of cysteine ​​monomer and dissolve it in deionized water as component A, then add a certain amount of hydroxyethyl acrylate monomer to the above solution as component B, distilled water as component C, press ( A+B): C is 1:4 (v / v) for mixing, where A:B is 3:7 (mol / mol); ultrasonic 20min to mix the solution evenly, and fill the mixed solution with N 2 to ensure anaerobic conditions.

[0037] 2. At a temperature of -63°C, use 137 Cs-γ-ray irradiation polymerization, the radiation dose is 1×10 4 Gy: The polymer hydrogel formed by radiation was cut into small pieces of 1cm×1cm×1cm, washed in the Erlenmeyer flask several times, and dried at 40°C for later use.

[0038] 3. Weigh 0.5g of xerogel into a three-neck bottle, add 300ml of distilled water, and bubble nitrogen for 30min to remove oxygen; weigh 2.1g of FeCl 2 .4H 2 O and 5.8gFeCl 3 .6H 2 Dissolve O in 10ml distilled water respectively, and add them into the three-neck bottle, slowly add 1...

Embodiment 3

[0041] 1. Weigh a certain mass of cysteine ​​monomer and dissolve it in deionized water as component A, then add a certain amount of hydroxyethyl acrylate monomer to the above solution as component B, distilled water as component C, press ( A+B): C is 3:7 (v / v) for mixing, where A:B is 1:1 (mol / mol); ultrasonic 20min to mix the solution evenly, and fill the mixed solution with N 2 to ensure anaerobic conditions.

[0042] 2. At a temperature of -78°C, use 60 Co-γ-ray irradiation polymerization, the radiation dose is 1×10 5 Gy: The polymer hydrogel formed by radiation was cut into small pieces of 1cm×1cm×1cm, washed in the Erlenmeyer flask several times, and dried at 40°C for later use.

[0043] 3. Weigh 0.5g of xerogel into a three-necked bottle, add 300ml of distilled water, and bubble argon for 30min to remove oxygen; weigh 2.1g of FeCl 2 .4H 2 O and 5.8gFeCl 3 .6H 2 Dissolve O in 10ml of distilled water and add them to three-neck flasks respectively, slowly add 3% ammo...

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Abstract

Disclosed is a method for preparing sulfydryl-containing magnetic hydrogel for adsorbing heavy metal ions. Hydroxyethyl acrylate monomers, L-cysteine monomers and distilled water are mixed and then are subjected to radiation polymerization to obtain the polymeric hydrogel, the polymeric hydrogel is used as a template to be subjected to in-situ loading for magnetic nano-iron, the ratio of Fe2+ to Fe3+ in iron salt solution for co-precipitation reaction ranges from 0.5(mol / mol) to 0.7(mol / mol), ferrous iron salt is optional one of FeSO4, 7H2O, FeCl2 and FeCl2.4H2O, ferric iron salt is optional one of FeCl3.6H2O and FeCl3, the reaction temperature ranges from 25 DEG C to 30 DEG C, and the reaction pH (potential of hydrogen) is controlled by 3-30% (wt%) of ammonia water or 0.02-0.2mol / l of NaOH so as to range from 7 to 9. The sulfydryl-containing magnetic hydrogel is subjected to in-situ loading for the magnetic nano-iron, the method is simple, and the heavy metal ions can be effectively removed when the sulfydryl-containing magnetic hydrogel prepared by the method is used for adsorbing the heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, and in particular relates to a magnetic hydrogel with mercapto groups, a preparation method thereof and an application in the adsorption of heavy metal ions. technical background [0002] In recent years, the utilization rate of heavy metals in the industrial sector has shown exponential growth, especially with the vigorous development of the mining industry, battery industry, fossil energy industry, electroplating industry, and electronics industry, the threat of heavy metal pollution to the human living environment has become increasingly significant. Heavy metals entering the environment will inhibit the metabolism of organisms at all levels in the environment and cause harm to human physiological functions and intelligence. At the same time, due to the persistence, toxicity and biochemical non-degradability of heavy metal pollutants, once they enter the environment, they will lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62B01D15/00C08F20/28C08F2/44C08F2/46C08K3/22
Inventor 李正魁华蓉吴宁梅刘丹丹叶忠香
Owner NANJING UNIV