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Absorbent material for selectively absorbing As<+5> ions and preparation method thereof

An ion adsorption and selective technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of expensive, unfavorable scale production, groundwater purification and preparation difficulties, and achieve accurate adsorption, Excellent long-term stability

Inactive Publication Date: 2011-09-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Someone cross-linked chitosan with a crown ether compound, which can be very good for As +5 ion enrichment (Application of crown ether cross-linked chitosan in arsenic speciation analysis, Journal of Wuhan University of Science and Technology (Natural Science Edition), 2007, 30(6): 636-639), due to the toxicity of polymer crown ether derivatives Although it is lower than crown ether, it is expensive and difficult to prepare, which is not conducive to the application of large-scale production and groundwater purification

Method used

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  • Absorbent material for selectively absorbing As&lt;+5&gt; ions and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh chitosan 0.05mol, add single-capped polyethylene glycol-400 with acrylic acid or methacrylic acid single-capped polyethylene glycol-400 macromonomer: chitosan=1: 1~5 (mol ratio) Macromonomer: Add double-capped polyethylene glycol-400 macromer with acrylic acid or methacrylic acid double-capped macromonomer: single-capped polyethylene glycol-400 macromonomer=1.5:1 (mol ratio) Alcohol-400 macromonomer was used as a crosslinker. Disperse 0.05mol of chitosan in 50% ethanol aqueous solution, the amount of the above ethanol aqueous solution is the required amount to make 0.05mol chitosan form a solution with a percentage concentration of 2.5% to 3%. . Then add the photoinitiator of single end-capped polyethylene glycol-400 macromonomer, double end-capped polyethylene glycol-400 macromonomer and the total mass of the above two reactive monomers of 1 to 5% respectively in the above dispersion liquid 1173, stir well. Regulate the acidity of the solution with acrylic aci...

Embodiment 2

[0025] Weigh chitosan 0.05mol, add single-capped polyethylene glycol-1000 with chitosan:acrylic acid or methacrylic acid single-capped polyethylene glycol-1000 macromonomer=1:1~5 (mol ratio) Macromonomer: Add double-capped polyethylene glycol with acrylic acid or methacrylic acid double-capped polyethylene glycol-1000 macromonomer: single-capped polyethylene glycol-1000 macromonomer=1.5:1 (mol ratio) Alcohol-1000 macromonomer was used as a crosslinker. Disperse 0.05mol of chitosan in 50% ethanol aqueous solution, the amount of the above ethanol aqueous solution is the required amount to make 0.05mol chitosan form a solution with a percentage concentration of 2.5% to 3%. . Then add the photoinitiator of single-end capped polyethylene glycol-1000 macromonomer, double-capped polyethylene glycol-1000 macromonomer and the total mass of the above two reactive monomers to 1-5% respectively in the above dispersion liquid 1173, stir well. Adjust the acidity of the solution with acry...

Embodiment 3

[0028] Weigh chitosan 0.05mol, add single-capped polyethylene glycol-400 with acrylic acid or methacrylic acid single-capped polyethylene glycol-400 macromonomer: chitosan=1: 1~5 (mol ratio) Macromonomer: Add double-capped polyethylene glycol-1000 macromonomer with acrylic acid or methacrylic acid double-capped polyethylene glycol-400 macromonomer=1.5:1 (mol ratio) Alcohol-400 macromonomer was used as a crosslinker. Disperse 0.05mol of chitosan in 50% ethanol aqueous solution, the amount of the above ethanol aqueous solution is the required amount to make 0.05mol chitosan form a solution with a percentage concentration of 2.5% to 3%. . Then add the photoinitiator of single-capped polyethylene glycol-400 macromonomer, double-capped polyethylene glycol-1000 macromonomer and the total mass of the above two reactive monomers to 1-5% respectively in the above dispersion liquid 1173, stir well. Regulate the acidity of the solution with acrylic acid or methacrylic acid to dissolve...

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Abstract

The invention discloses a preparation method for an absorbent material capable of selectively absorbing As<+5> ions in the technical field of underground water contamination and water treatment. The method comprises: firstly, mixing chitosan dispersion with a mono-capped polyethylene glycol macromonomer, a double-capped polyethylene glycol macromonomer and a photoinitiator to prepare prepolymer solution; secondly, further adding aqueous solution of sodium arsenate to realize As<+5> ion imprinting; and finally, obtaining the absorbent material capable of selectively absorbing the As<+5> ions by acid soaking and washing neutralization. In the invention, chitosan which is a natural alkaline polysaccharide capable of forming complexes with transitional elements is dissolved in acrylic acid and methacrylic acid mono-capped and double-capped polyethylene glycol macromonomers, the As<+5> ions are used for molecular imprinting, imprinted molecules are removed by diluted hydrochloric acid after crosslinking and curing, and thus, a three-dimensional hole interpenetrating polymer network absorbent resin to be specifically bonded As<+5> ions is obtained. The absorbent material has high selectivity and high adsorbability for As<+5> ions and helps to accurate enrichment of As<+5> ions to remove and recover As<+5> ions.

Description

technical field [0001] The invention relates to a preparation method of resin in the field of groundwater pollution restoration and water treatment, in particular to a polymer interpenetrating network As +5 Ion imprinted molecular adsorption material and its preparation method. Background technique [0002] Groundwater is not only an important water resource, but it accounts for 95% of the world's available freshwater resources. In my country's total urban water use, groundwater accounts for 30%. The proportions of groundwater utilization in North China and Northwest cities are as high as 72% and 66% respectively. Groundwater is an important part of the ecosystem. The pollution of groundwater not only affects the utilization of water resources, but also leads to the destruction of the ecosystem. At present, my country's groundwater is seriously polluted, and the pollutants are mainly heavy metals, organic matter and nitrate, most of which are compound pollution. Arsenic ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C08J9/26C08L5/08C02F1/28C02F1/62
Inventor 刘预孙承兴徐慧仵彦卿
Owner SHANGHAI JIAO TONG UNIV
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