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Adsorbent for removing arsenate ions in waste water

An adsorbent, arsenate technology, applied in the fields of adsorption water/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problems of time-consuming and low adsorption efficiency

Inactive Publication Date: 2018-09-04
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

Domestic patents CN1830822A and CN104801527A respectively reported that Mg(Zn)Al-LDHs and CaAl-LDHs can be used to adsorb arsenate in wastewater, but the adsorption efficiency is very low, and it takes a lot of time to prepare LDHs, which cannot be done very quickly. well meet the requirements of industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] 1. Preparation of Mg 2 Fe-LDHs

[0015] (1) Dissolve 23.68g of magnesium nitrate and 32.32g of ferric nitrate into 200mL of water, and name it solution A. Dissolve 31.8g of sodium carbonate and 4g of sodium hydroxide into 200mL of water, named solution B. Solution A and solution B are added dropwise to decarbonated deionized water at a speed of 0.5mL / min at the same time to form a reaction solution. By adjusting the rate of addition of solution A and solution B, the pH of deionized water is always maintained at (6 ±0.3), dropwise crystallized at room temperature for 6h, centrifuged and dried to obtain powdered Mg 2 Fe-LDHs.

[0016] (2) Dissolve 23.68g of magnesium nitrate and 32.32g of ferric nitrate into 200mL of water, and name it solution A. Dissolve 31.8g of sodium carbonate and 4g of sodium hydroxide into 200mL of water, named solution B. Solution A and solution B are added dropwise to decarbonated deionized water at a speed of 20mL / min at the same time to fo...

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PUM

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Abstract

The invention provides a method for removing arsenate ions in waste water according to magnesium-iron binary hydrotalcite, which belongs to the field of water treatment adsorption of environmental protection. The Mg2Fe-LDHs adsorbent is prepared in a co-precipitating manner. Under the room-temperature condition, the adsorbent is added into a waste water solution according to a mass ratio of the adsorbent to the arsenate negative ions in the waste water being (0.16 to 8) to 1 and stirred for one hour, so that the adsorption balance can be achieved. The adsorption capability of the adsorbent forthe arsenate negative ions can reach 415 mg / g. The method has the advantages of low cost, simple process and good treatment effect.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to the application of magnesium-iron binary hydrotalcite as an adsorbent to remove arsenate in waste water. Background technique [0002] Arsenic is one of the most toxic substances that people have discovered so far. It can cause damage to human liver and kidney function, damage the nerve, blood and immune system, and even cause cancer in severe cases. The water environment is an important medium and way for the generation and release of arsenic. The discharge of arsenic-containing industrial wastewater such as metallurgy, chemical industry, tanning, and textiles, as well as the use of arsenic-containing pesticides and other human activities have caused a sharp increase in arsenic content in surface water or groundwater in some areas, seriously threatening people's health. Arsenate is a common form of arsenic in water, so it is necessary to research and develop effective t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06C02F1/28C02F101/10
CPCB01J20/06C02F1/281C02F2101/103
Inventor 王成许秋瑾
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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