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Method of using magnesium-aluminum-iron ternary hydrotalcite-like to remove perchlorate in water

A perchlorate and water removal technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of high economic cost and low perchlorate treatment efficiency, and achieve adsorption The effect of large capacity, good economic and environmental benefits, and low cost

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

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for removing perchlorate in water for the defects of low perchlorate treatment efficiency and high economic cost in the prior art

Method used

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  • Method of using magnesium-aluminum-iron ternary hydrotalcite-like to remove perchlorate in water
  • Method of using magnesium-aluminum-iron ternary hydrotalcite-like to remove perchlorate in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Weigh 192.3075g magnesium nitrate hexahydrate, 75.026g aluminum nitrate nonahydrate and 20.201g ferric nitrate nonahydrate, namely [Mg 2+ ] / [Al 3+ ] / [Fe 3+ ]=3:0.8:0.2.

[0047] (2) Pour the mixed salt into a 500mL Erlenmeyer flask, mix well and then add 150mL deionized water to dissolve. If there are fine particles that cannot be dissolved, you can ultrasonicate for 3-5 minutes and stir on an electromagnetic stirrer. It will dissolve completely after half an hour The mixture is called a. Weigh 80.02g of anhydrous sodium hydroxide and 52.995g of anhydrous sodium carbonate, pour them into another 500mL conical flask, and quickly add 150mL of deionized water to dissolve them. After ~5min, electromagnetically stir evenly to obtain a completely dissolved solution b.

[0048] (3) 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 reserve two p...

Embodiment 2

[0057] (1) Take by weighing 192.3075g magnesium nitrate hexahydrate, 56.2695g aluminum nitrate nonahydrate and 40.399g ferric nitrate nonahydrate, [Mg 2+ ] / [Al 3+ ] / [Fe 3+ ]=3:0.6:0.4.

[0058] (2) Repeat steps (1) to (8) in Example 1. The magnesium-aluminum-iron ternary hydrotalcites [Mg 3 Al 0.6 Fe 0.4 (OH) 16 ]CO 3 4H 2 O (see its XRD spectrum figure 1 ) and calcined magnesium-aluminum-iron ternary hydrotalcite-like Mg 3 Al 0.6 Fe 0.4 o 9 .

[0059] (3) measured [Mg 2+ ] / [Al 3+ ] / [Fe 3+ ]=3:0.6:0.4, the removal rate of adsorbent to perchlorate was 88.92%.

Embodiment 3

[0061] (1) Repeat steps (1) to (6) in Example 1.

[0062] (2) Configuration series of perchlorate initial concentration is 2000μg / L, pH value is respectively 200mL of solution of 2, 4, 6, 8, 10, 12, and drops into 0.2g adsorbent respectively (adsorbent and solution mass ratio is 1 : 1000), put it into a shaker at 25°C at normal temperature, rotate at 200rpm, and vibrate for 12h, then get 5mL of the adsorption solution to filter through a 0.45μm filter membrane, and measure the adsorption rate of perchlorate by ion chromatography.

[0063] (3) The perchlorate removal rates of adsorbents for pH values ​​of 2, 4, 6, 8, 10, and 12 were 28%, 90.65%, 90.89%, 88.29%, 88.75%, and 33.80%, respectively.

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Abstract

The invention belongs to the field of inorganic laminated material preparation and the field of water purification, and relates to a method for removing perchlorate in water. The method includes steps: firstly, adding adsorbent into perchlorate-contained water for adsorption; and secondly, intercepting the adsorbent in water for separation treatment after adsorption is complete. The method is mild in condition, low in production cost and recyclable, raw materials are easily obtainable, adjustment of solution pH is not needed, and removal rate of the perchlorate can reach 70% in 30 minutes and reach 90% after 6 hours. The method for removing perchlorate in water has fine application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic layered materials and the field of water purification, and relates to a method for removing perchlorate in water. Background technique [0002] Perchlorate is a new pollutant with high stability, high diffusivity and persistence. When perchlorate dissolves and enters the natural water environment, it can pass through various channels, such as water, plants, etc., and then enter the human body or other animals through the digestive system. Although there are different routes of transmission, the organ that is ultimately most affected by perchlorate is the thyroid gland. Lower concentrations of perchlorate can interfere with the normal function of the human thyroid gland. This is mainly because the charge and ionic radius of perchlorate is very close to that of iodide ions. It competes with iodide ions to enter the thyroid gland of the human body, thereby hindering the absorption of iodine,...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/58B01J20/08
Inventor 杨一琼高乃云马艳郭洪光周超
Owner TONGJI UNIV
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