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Method for removing anion pollutants from water

An anionic pollutant and water removal technology, applied in the field of purification treatment, can solve the problems of high economic cost, high economic cost and operating cost, non-recyclable use, etc., to achieve increased adsorption surface area, good application prospects, and mild preparation conditions. Effect

Inactive Publication Date: 2012-06-20
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the above-mentioned anion pollutants, the main removal technologies are adsorption method and ion exchange method. The adsorption method often uses activated alumina, clay, and other materials to remove anions, but it is usually a one-time investment and cannot be recycled.
The adsorption effect of activated carbon is poor, and the adsorption effect of modified activated carbon is slightly better, but there are disadvantages such as high economic cost and easy desorption of modified materials, which cannot guarantee the safety of drinking water
However, the ion exchange method usually has relatively high economic and operating costs, and the dope requires further treatment.
[0004] Layered double metal hydroxides can use the substitutable effect of interlayer anions to remove some anion pollutants in water, but due to the different ion exchange capabilities, some anion pollutants such as perchlorate are difficult to remove by replacement.

Method used

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  • Method for removing anion pollutants from water
  • Method for removing anion pollutants from water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Weigh 192.3075g of magnesium nitrate hexahydrate and 101.005g of ferric nitrate nonahydrate, pour them into a 500mL conical flask, mix well and then add 150mL of deionized water to dissolve. If there are fine particles that cannot be dissolved, ultrasonication can be used for 3 to 5 minutes After stirring on an electromagnetic stirrer, the mixed solution that is completely dissolved after half an hour is called a. Weigh 80.02g of anhydrous sodium hydroxide and 52.995g of anhydrous sodium carbonate respectively, pour them into another 500mL conical flask, and quickly add 150mL of deionized water to dissolve them. If there are fine particles that cannot be dissolved, use ultrasonic After 3 to 5 minutes, electromagnetically stir evenly to obtain a completely dissolved solution b.

[0045] (2) Clean the two 150mL constant pressure funnels, dry them, and check their tightness. When ready, transfer most of the solutions a and b to the two constant pressure funnels, and re...

Embodiment 2

[0056] (1) Repeat steps (1) to (5) of Example 1.

[0057] (2) Deionized water is respectively configured with ClO 4 - Concentration 2000μg / L, BrO 3 - Concentration 2000 - μg / L, NO 3 - Concentration 5000μg / L, Cl - Concentration 5000μg / L, H 2 PO 4 - Concentration 5000μg / L, SO 4 2- Concentration 5000μg / L, CO 3 2- A solution with a concentration of 5000 μg / L. Use graduated cylinders to pipette 200mL of the mixed solution into 250mL ground-necked flasks.

[0058] (3) Put 0.5 g of magnesium-iron layered double metal oxide with a particle size of 140 mesh into the above-mentioned deionized water containing anion pollutants (the weight ratio of adsorbent to water is 1:400), and put After shaking for 12 hours at a rotating speed of 200rpm, 5mL of the adsorption liquid was filtered through a 0.45μm filter membrane, and the adsorption rate of the adsorbent for each anion pollutant was determined by ion chromatography.

[0059] After 12h of adsorption was determined by ion...

Embodiment 3

[0061] (1) Repeat steps (1) to (5) of Example 1.

[0062] (2) configure ClO 4 -Each 200mL solution with an initial concentration of 2000μg / L and pH values ​​of 2, 4, 6, 8, 10, and 12 was added with 0.5g of adsorbent (the weight ratio of adsorbent to water was 1:400). Put it into a shaking table at a speed of 200rpm, shake for 12 hours, take 5mL of the adsorption solution and filter it through a 0.45μm filter membrane, and measure the removal efficiency of the adsorbent for perchlorate by ion chromatography.

[0063] (3) Experiments showed that the removal rates of perchlorate with pH values ​​of 2, 4, 6, 8, 10, and 12 by the adsorbent were 45%, 88.51%, 90.40%, 89.92%, 85.92, and 53.76%, respectively.

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Abstract

The invention belongs to the technical field of purification treatment, and relates to a method for removing anion pollutants from water. The method comprises the following steps of: (1) adding an adsorbent into a water body polluted by anion pollutants and undergoing an adsorption reaction at a certain temperature; and (2) after adsorption is completed, intercepting, separating and treating the adsorbent in water. The anion pollutants in drinking water are adsorbed by using the structure recovery function of a stratified bimetal hydroxide. The adsorbent has the advantages of mild preparation conditions, readily-available raw materials, low production cost, high adsorption efficiency, recyclability, removing rate of over 80 percent on common anion pollutants and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of purification treatment and relates to a method for removing anionic pollutants in water. Background technique [0002] In recent years, with the development of the economy and the increase of the population, the industrial and domestic sewage has been increasing, and the pollution of the water environment has become increasingly serious. Among them, anionic pollutants are a major pollutant in the water environment pollution. Among them, F - , Cl - , NO 3 - -N and SO 4 2- is a traditional anionic pollutant, while ClO 4 - , BrO 3 - , ClO 3 - etc. are recently emerging anionic pollutants. Fluorine is a highly toxic substance, and micrograms of fluorine can inhibit the activity of enzymes in organs and tissues such as bones, teeth, cardiovascular, kidneys, and nervous system. Excessive chloride levels in water can damage metal pipes and buildings and hinder plant growth. Nitrate nitrogen is the ...

Claims

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Application Information

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IPC IPC(8): C02F1/28
Inventor 杨一琼高乃云高玉琼邓靖谈超群
Owner TONGJI UNIV
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