Hydrogel used for adsorbing heavy metal and preparing method and application thereof

A technology for adsorbing heavy metals and hydrogels, which is applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, and water pollutants. It can solve the problems of difficult recycling, poor reusability, and low adsorption capacity, and achieve an increase in adsorption capacity. , enhance the mechanical strength, increase the effect of adsorption capacity

Active Publication Date: 2016-02-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three key factors that restrict the use of hydrogel as an adsorbent for removing heavy metals are low adsorption capacity, poor mechanical strength, which lead to difficult recycling and poor reusability.

Method used

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  • Hydrogel used for adsorbing heavy metal and preparing method and application thereof
  • Hydrogel used for adsorbing heavy metal and preparing method and application thereof
  • Hydrogel used for adsorbing heavy metal and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation method of above-mentioned hydrogel is carried out by following reaction equation:

[0036]

[0037] The specific steps are as follows:

[0038] (1) 2-vinyl-4,6-diamino-1,3,5-s-triazine (VDT) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) are mixed as reactants, then Add 1% to 10% of the total mass of the reactants and a photoinitiator of 1% to 2.5% of the total mass of the reactants, and dissolve them uniformly in the organic solvent together with the reactants; the crosslinking agent can be N , N-methylenebisacrylamide, polyethylene, polyvinyl chloride, chlorinated polyethylene, etc., the photoinitiator can be 2-hydroxy-4-(2-hydroxyethoxy)-2-methylbenzene Acetone, azobisisobutyl, diphenylethanone, 2,4-dihydroxybenzophenone, etc., the organic solvent can be dimethyl sulfoxide, acetone, methanol, n-hexane, etc.; due to the VDT Amino groups and triazine groups can form a six-membered ring structure through hydrogen bonding. The molar ratio of VD...

Embodiment 1

[0044](1) Weigh 137.15mg VDT (2-vinyl-4,6-diamino-1,3,5-s-triazine), 310.875mgAMPS (2-acrylamide-2-methylpropanesulfonic acid) (VDT and The molar ratio of AMPS is 2:3) as a reactant, and 19.275 mg (5% of the total mass of the reactant) of MBAA (N,N-methylenebisacrylamide) was added to a 5ml centrifuge tube, and the mixture was ultrasonically dissolved In the dimethyl sulfoxide of 3.70ml, obtain mixed solution A; Then in mixed solution A, add photoinitiator 2-hydroxyl-4-(2-hydroxyethoxy)-2-methyl propiophenone 11.21mg ( 2.5% of the total mass of the reactant), sonicated until completely dissolved to obtain the mixed solution B.

[0045] (2) Slowly inject the mixed solution B into the mold, seal it with a rubber silicon tube and clamp it with a clip, and irradiate it under a 20W ultraviolet lamp for 20 minutes to obtain a hydrogel polymer. The reaction equation is as follows figure 1 shown.

[0046] (3) The obtained copolymer hydrogel polymer is taken out from the mold, rinsed...

Embodiment 2

[0048] Repeat Example 1 with the same steps described above, the difference is that the crosslinking agent is polyethylene, the photoinitiator is azobisisobutyl, and the organic solvent is acetone, methanol, and n-hexane.

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Abstract

The invention discloses hydrogel used for adsorbing heavy metal. The hydrogel is a copolymer composed of 2-vinyl-4,6-diamino-1,3,5-symtriazine and 2-acrylamide-2-methyl propane sulfonic acid according to the molar ratio of 1:3-2:3, the hydrogel is of a porous structure, the pore diameter of the porous structure is 12-28 micrometers, a part of amino of 2-vinyl-4,6-diamino-1,3,5-symtriazine and triazinyl form a hexatomic ring structure through hydrogen bonds so that the mechanical strength of the hydrogel can be enhanced, and sulfonic acid groups in the hydrogel are used for exchanging ions with heavy metal ions; meanwhile, amino groups in the hydrogel are used for chelating the heavy metal ions. The prepared hydrogel is provided with the porous network structure, which is beneficial for dispersing water molecules and absorbing the heavy metal; meanwhile, the hydrogel has a good cyclic adsorption property, can be used many times, and is more environmentally friendly.

Description

technical field [0001] The invention belongs to the field of molecular material technology and environmental protection, and more specifically relates to a hydrogel for adsorbing heavy metals and its preparation method and application. Background technique [0002] Heavy metal ion pollution in water has attracted great attention due to its toxicity to humans and the entire ecological environment. The accumulation of heavy metal ions in the human body can lead to brain, skin, pancreas and heart diseases. Therefore, it is necessary to remove heavy metal ions from polluted water before it is discharged into the environment. At present, researchers have developed many methods to remove heavy metal ions, mainly including ion exchange, membrane separation, chemical precipitation, adsorption and so on. Among these methods, adsorption is considered to be the most economical and effective technology, which has the advantages of low cost, convenient operation, easy control, and no s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F226/02C08F222/38C08F2/48B01J20/291C02F1/28C02F101/20
Inventor 周爱姣万骏陶涛陈林罗凡冯晓楠
Owner HUAZHONG UNIV OF SCI & TECH
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