Method for controlling organic arsenic pollution in water by ordered mesoporous layered bimetal hydroxide

A hydroxide and bimetal technology, applied in the direction of alkali metal oxide/hydroxide, metal/metal oxide/metal hydroxide catalyst, alkali metal compound, etc., can solve the problem of arsenic pollutant removal, etc. Achieve the effects of small secondary pollution, easy realization and simple operation

Active Publication Date: 2019-10-08
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, studies have used UV / H 2 o 2 , UV / O 3 Such advanced oxidation technologies oxidize organic arsine and show a good removal effect, but only realize the oxidation conversion of organic arsine to inorganic arsenic, and do not completely remove arsenic pollutants from water bodies. After this process, follow-up is needed. Treatment process

Method used

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  • Method for controlling organic arsenic pollution in water by ordered mesoporous layered bimetal hydroxide

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Effect test

Embodiment 1

[0034] A method for controlling organic arsine pollution in water by using ordered mesoporous layered double hydroxides, said method comprising the steps of:

[0035] Step 1: Preparation of ordered mesoporous ZnTi-LDHs

[0036] S1. Add 5.04g of poloxamer into 100mL of deionized water, and stir vigorously at 60°C until completely dissolved;

[0037] S2, successively add 0.22mLTiCl 4 , 1.19gZn (NO 3 ) 2 ·6H 2 0 and 3g of urea are added to the mixed solution of step S1 and vigorously stirred until completely dissolved;

[0038]S3. Put the mixed solution in step S2 in an autoclave for aging for 48 hours at a temperature of 130° C., centrifuge the aged solution to obtain a precipitate, wash the precipitate with ethanol and deionized water several times in turn, and then place the precipitate at 60° C. Dry overnight at temperature;

[0039] S4. Grinding the dried solid first, then placing it in a muffle furnace at a temperature of 350° C. for 3 hours, and naturally cooling to ...

Embodiment 2

[0047] A method for controlling organic arsine pollution in water by using ordered mesoporous layered double hydroxides, said method comprising the steps of:

[0048] Step 1: Preparation of ordered mesoporous ZnTi-LDHs

[0049] S1. Add 5.04g of poloxamer into 100mL of deionized water, and stir vigorously at 60°C until completely dissolved;

[0050] S2, successively add 0.22mLTiCl 4 , 1.19gZn (NO 3 ) 2 ·6H 2 0 and 3g of urea are added to the mixed solution of step S1 and vigorously stirred until completely dissolved;

[0051] S3. Put the mixed solution in step S2 in a high-pressure reactor for aging at 120°C for 40 hours, centrifuge the aged solution to obtain a precipitate, wash the precipitate with ethanol and deionized water several times in turn, and then place the precipitate at 50°C Dry overnight at temperature;

[0052] S4. Grinding the dried solid first, then placing it in a muffle furnace for 3.5 hours at a temperature of 300° C., and cooling to room temperature ...

Embodiment 3

[0060] The ratio of the dosage mg of ordered mesoporous ZnTi-LDHs in this embodiment to the volume L of raw water is 400-500:1, and other steps are the same as in Embodiment 1.

[0061] The removal rate of arsanic acid in this embodiment is 99.3%. Inorganic arsenic was not detected.

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Abstract

The invention belongs to the technical field of water treatment, and provides a method for controlling organic arsenic pollution in water by novel photocatalytic material-ordered mesoporous layered bimetal hydroxide for the first time. According to existing oxidation techniques UV / H2O2, UV / O3 and the like for removing organic arsenic in water, organic arsenic is converted into inorganic arsenic inan oxidation manner, and arsenic pollutants cannot be thoroughly removed from the water. Ordered mesoporous ZnTi-LDHs have interlayer negative ion exchange characteristics, high specific surface areas and rich three-dimensional open-framework structures, photocatalytic activity can be greatly improved, and released organic arsenic is synchronously enriched. The Ordered mesoporous ZnTi-LDHs can berecycled after being used, and running cost is reduced. The method is simple to operate easy to implement. According to the method, the dissolution concentration of metal ions is low, and secondary pollution is less. According to the method, arsanilic acid in water can be effectively removed, removing rate reaches up to 98% or more, and inorganic arsenic cannot be basically detected.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for photocatalytically removing organic arsine in water by using ordered mesoporous layered double metal hydroxides. Background technique [0002] Since the 1950s, western developed countries have used organic arsine preparations as feed additives in the aquaculture industry. In 1993, the Ministry of Agriculture of my country officially approved the production of arsanic acid (p-ASA), and in 1996 approved the use of roxarsine (ROX), and organic arsine preparations began to be widely used in my country. They have the effect similar to antibiotics, can improve feed utilization rate and conversion rate, enable animals to absorb more nutrients and thus improve the survival rate and daily weight gain rate of livestock and poultry, so they have been vigorously promoted and used at the beginning of their discovery . Organic arsine compounds are hardly meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J35/10B01J20/02B01J20/28B01J20/30C02F1/28C02F1/30C02F101/10C02F101/30
CPCB01J20/0211B01J20/0248B01J20/28083B01J23/06B01J35/0033B01J35/004B01J35/10B01J35/1004C02F1/281C02F1/30C02F2101/103C02F2101/30
Inventor 邓靖陈胜男蔡安洪阮书瑜陈吴傲啸徐梦苑邱春根
Owner ZHEJIANG UNIV OF TECH
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