Method for preparing copper ion selective adsorbent by sodium alginate/chitosan compounding

A technology of sodium alginate and copper alginate, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problem of low copper ion adsorption selectivity, occupying effective adsorption sites, and hindering copper ions. Imprint site construction and other issues, to achieve the effect of low production cost, enhanced recognition, and guaranteed stability

Active Publication Date: 2018-06-29
FUZHOU UNIVERSITY
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  • Abstract
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Problems solved by technology

However, sodium alginate / chitosan generally requires calcium ions to crosslink and solidify sodium alginate during the composite process. Calcium ions, as hetero ions, occupy effective adsorption sites and hinder the construction of copper ion imprinted sites, resulting in The selectivity of the product for the adsorption of copper ions is not high

Method used

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  • Method for preparing copper ion selective adsorbent by sodium alginate/chitosan compounding
  • Method for preparing copper ion selective adsorbent by sodium alginate/chitosan compounding
  • Method for preparing copper ion selective adsorbent by sodium alginate/chitosan compounding

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preparation example Construction

[0030] (1) Preparation of copper alginate pellets

[0031] Dissolve 0.6-0.9 parts by weight of sodium alginate in water to obtain 60 parts by weight of sodium alginate solution; dissolve 0.9-1.8 parts by weight of copper chloride in water to obtain 60 parts by weight of copper chloride solution, drop the sodium alginate solution Put into copper chloride solution to cross-link and solidify into balls, filter and wash with water after reacting for 1.5-2.5 hours, to obtain copper alginate pellets;

[0032] (2) Preparation of copper alginate / chitosan composite pellets

[0033] Get 0.4-0.8 weight part chitosan and 0.02-0.11 weight part cupric chloride powder and join in the 1% acetic acid solution of 39.5 weight parts and stir and dissolve to obtain solution, the copper alginate pellet that step (1) makes is transferred to In this solution, after compounding for 20-28 hours, filter and wash with water to obtain copper alginate / chitosan composite pellets;

[0034] (3) Pre-crosslin...

Embodiment 1

[0051] A kind of method that sodium alginate / chitosan composite prepares copper ion selective adsorbent

[0052] (1) Preparation of copper alginate pellets: 0.6 g of sodium alginate was dissolved in water to obtain 60 g of sodium alginate solution; 1.3 g of copper chloride was dissolved in water to obtain 60 g of copper chloride solution. drop the sodium alginate solution into the copper chloride solution to cross-link and solidify into balls, react for 2 hours, filter and wash with water to obtain copper alginate pellets;

[0053] (2) Preparation of copper alginate / chitosan composite pellets: get 0.4g chitosan and 0.08g cupric chloride powder and join in 39.5g of 1% acetic acid solution and stir to dissolve, the prepared by step (1) The copper alginate pellets were transferred to the solution, filtered and washed with water after compounding for 24 hours to obtain copper alginate / chitosan composite pellets;

[0054] (3) Pre-crosslinking of copper alginate / chitosan composite ...

Embodiment 2

[0066] A kind of method that sodium alginate / chitosan composite prepares copper ion selective adsorbent

[0067] (1) Preparation of copper alginate pellets: 0.9 g of sodium alginate was dissolved in water to obtain 60 g of sodium alginate solution; 1.8 g of copper chloride was dissolved in water to obtain 60 g of copper chloride solution. drop the sodium alginate solution into the copper chloride solution to cross-link and solidify into balls, react for 2 hours, filter and wash with water to obtain copper alginate pellets;

[0068] (2) Preparation of copper alginate / chitosan composite pellets: get 0.8g chitosan and 0.11g cupric chloride powder and join in 39.5g of 1% acetic acid solution and stir to dissolve, and the prepared The copper alginate pellets were transferred to the solution, filtered and washed with water after compounding for 24 hours to obtain copper alginate / chitosan composite pellets;

[0069] (3) Pre-crosslinking of copper alginate / chitosan composite pellets:...

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Abstract

The invention discloses a method for preparing a copper ion selective adsorbent by sodium alginate / chitosan compounding. The method comprises the following steps of firstly preparing a copper alginatepellet, afterwards, compounding the copper alginate pellet with chitosan, next, carrying out aldehyde pre-cross-linking and epoxy chloropropane cross-linking on a copper alginate / chitosan composite pellet, and finally eluting a copper ion by using hydrochloric acid to obtain the copper ion selective adsorbent. According to the method, the copper ion is used as a curing agent of sodium alginate and a template of ionic imprinting; a calcium ion is not added in a whole course; the construction of an imprinting site of the copper ion is ensured; the stepwise cross-linking is carried out on the composite pellet by adopting different cross-linking agents; the cross-linked structure is optimized; the recognizability of the imprinting site to the copper ion is enhanced; the selectivity of the adsorbent to the copper ion is improved. The method is wide in raw-material source, simple in preparation process and lower in production cost, and the adsorbent prepared by the method provided by the invention is high in adsorption quantity to the copper ion and good in selectivity, can be repeatedly recycled, moreover, is environmentally friendly, and has wide development and application prospects.

Description

technical field [0001] The invention belongs to the field of functional materials, relates to environmental heavy metal pollution prevention and control technology, and more specifically relates to a method for preparing a copper ion selective adsorbent by compounding sodium alginate / chitosan. Background technique [0002] Copper is one of the trace metal elements necessary for organisms and plays an important role in the growth and development of organisms. However, with the increasing mining, smelting, processing and application of metal resources, heavy metals such as copper continue to enter the water and soil, seriously affecting the growth, development and reproduction of animals and plants, and the copper in the environment is passed layer by layer through the biological chain It will eventually enter the human body. Heavy metals such as copper are difficult to excrete from the body through metabolism. The accumulation in the body seriously threatens the health of hum...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28019C02F1/286C02F2101/20
Inventor 李晓陈旻阳张卫英英晓光叶卓亮
Owner FUZHOU UNIVERSITY
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