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Prepn process of resin-based dearsenifying adsorbent

An adsorbent and resin-based technology, which is applied in the field of preparation of resin-based adsorbents, can solve problems such as not being retrieved, and achieve the effect of improving adsorption selectivity and improving environmental quality

Active Publication Date: 2006-05-17
JIANGSU NJU ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No literature was found on the synthesis method of resin-based arsenic-removing adsorbent using strongly basic anion-exchange resin as the matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a 2500ml beaker, add 65g FeCl 3 , 400mL concentrated hydrochloric acid (weight content 36.5%), 117gNaCl, dissolve fully and set the volume to 2L. FeCl in the solution A 3 0.2mol / L, HCl 2mol / L, NaCl 1mol / L.

[0021] Weigh 8g NaOH, 4gNaCl in a 100mL volumetric flask, and constant volume can obtain solution B.

[0022] Get 30g IRA400 (produced by U.S. Amberlite Company), put it into a glass adsorption column with an internal diameter of 50mm and a length of 600mm, pass the above-mentioned 1L solution A through the adsorption column equipped with resin at a speed of 3BV / h, and dehydrate the resin after the reaction is complete. Then quickly add it to solution B, rinse the resin with ethanol and heat-treat the resin in a drying oven at 55 degrees Celsius for 12 hours to obtain a resin-based arsenic-removing adsorbent. The Fe content on this resin was 22.3 mg / g.

Embodiment 2

[0024] In a 2500ml beaker, add 97.5g FeCl 3 , 1600mL concentrated hydrochloric acid (36.5%), 234g NaCl, fully dissolved and dilute to 2L. FeCl in the solution A 3 0.3mol / L, HCl 8mol / L, NaCl 2mol / L.

[0025] Weigh 6g NaOH, 1gNaCl in a 100mL volumetric flask, and constant volume to obtain solution B.

[0026] Get 30g IRA900 (produced by U.S. Amberlite Company), put it into a glass adsorption column with an internal diameter of 50mm and a length of 600mm, pass the above-mentioned 2L solution B through the adsorption column equipped with resin at a speed of 4BV / h, and dehydrate the resin after the reaction is complete. Then it was quickly added to solution B, rinsed with ethanol, and then heat-treated the resin in a drying oven at 58 degrees Celsius for 14 hours to obtain an immobilized Fe(III)-macroporous strong basic anion exchange resin. The content of Fe immobilized on the resin was 42.6 mg / g.

Embodiment 3

[0028] In a 2500ml beaker, add 130g FeCl 3 , 800mL of concentrated hydrochloric acid (36.5%), 468g of NaCl, fully dissolved and dilute to 2L. FeCl in the solution A 3 0.4mol / L, HCl 4mol / L, NaCl 4mol / L.

[0029] Weigh 10g NaOH, 2gNaCl in a 100mL volumetric flask, and constant volume to obtain solution B.

[0030] Take 30g of D201 (provided by Hangzhou Zhengguang Resin Co., Ltd.), put it into a glass adsorption column with an inner diameter of 50mm and a length of 600mm, pass the above 2L solution A through the adsorption column with resin at a speed of 5BV / h, and put the resin into the column after the reaction is complete. Dehydration, then quickly added to solution B, rinsed with ethanol, heat-treated the resin in a drying oven at 54 degrees Celsius for 18 hours, and obtained the solid-supported Fe(III)-macroporous strong basic anion exchange resin. The content of Fe immobilized on the resin was 56.7mg / g.

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PUM

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Abstract

The resin-based dearsenifying adsorbent is prepared with macroporous and gel type strong alkaline anionic exchange resin as basic material and water solution of FeCl3, HCl, NaCl in different compounding proportions as reagent, and through reaction. The strong alkaline anionic exchange resin has Fe(III) carrying amount of 2-9 wt%. Compared with strong alkaline anionic exchange resin without Fe(III) carried, the strong alkaline anionic exchange resin with Fe(III) has even higher adsorption selectivity and adsorption capacity on high toxicity As(III) and As(V) in water and excellent kinetic performance. The resin-based dearsenifying adsorbent of the present invention has greatly raised, normally 200 times raised, adsorption selectivity on micro as in water solution, and raised, normally 40-300 % raised, adsorption capacity, and is favorable to improving water environment quality.

Description

1. Technical field [0001] The invention relates to a preparation method of a resin-based adsorbent with anion exchange resin as a matrix, more specifically a preparation method of a resin-based adsorbent for removing arsenic. 2. Background technology [0002] Regarding the mechanism of arsenic adsorption by hydrated iron oxide, it has been reported in the literature that there is a strong complexation and coordination ability between Fe(III) and As, which can improve the selectivity to arsenic and increase the processing capacity of the resin (Min Jang, Eun WooShin , Jae Kwang Park et al., Mechanisms of arsenate adsorption by highly-ordered nano-structured silicate media impregnated with metal oxides. Environ. Sci. Technol. 2003, 37, 5062-5070). Foreign scholars have confirmed the effect of immobilizing Fe(III) resin through experiments: the Cl ubiquitous in water - 、HCO 3 - , SO 4 2- Such anions can reduce the selectivity of common anion ion exchange resins to arsenic,...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J41/13
Inventor 潘丙才陈新庆张炜铭潘丙军沈威张庆建杜伟张全兴陈金龙
Owner JIANGSU NJU ENVIRONMENTAL TECH
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