Method for adsorbing and reducing Cr (VI) based on iron magnesium aluminum hydrotalcite

A technology of hydrothermal method and iron-containing raw materials, which is applied in the direction of chemical instruments and methods, reduced water/sewage treatment, water pollutants, etc., can solve the problems of secondary pollution, Cr(VI cannot be fundamentally removed, etc., and avoid The effect of secondary pollution, low raw material and simple process

Inactive Publication Date: 2018-06-15
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption method only transfers Cr(VI) from one phase to another, not only cannot remove Cr(VI) fundamentally, but also easily produces secondary pollution in the subsequent treatment of Cr(VI)

Method used

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  • Method for adsorbing and reducing Cr (VI) based on iron magnesium aluminum hydrotalcite
  • Method for adsorbing and reducing Cr (VI) based on iron magnesium aluminum hydrotalcite
  • Method for adsorbing and reducing Cr (VI) based on iron magnesium aluminum hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Synthesis:

[0042] 1) Press Mg 5.7 Fe 0.3 al 2 (OH) 16 CO 3 4H 2 The stoichiometric ratio of O weighs raw material magnesium nitrate (Mg(NO 3 ) 2 ) 1.6872g, ferrous nitrate (Fe(NO 3 ) 2 ) 0.1079g, aluminum nitrate (Al(NO 3 ) 3 9H 2 O) 1.5005g, sodium hydroxide (NaOH) 1.28g and sodium carbonate (NaOH) 2 CO 3 ) 0.212g, in Mg(NO 3 ) 2 , Fe(NO 3 ) 2 , Al(NO 3 ) 3 9H 2 O was added deionized water to form a homogeneous solution A, in NaOH and Na 2 CO 3 Add deionized water to form a homogeneous solution B.

[0043] 2) Add solution A to solution B dropwise under magnetic stirring, and pour the resulting mixed suspension into an autoclave, preheat at 60°C for 1 hour, then raise to 120°C for 15 hours of heat treatment. Finally, after washing, suction filtration and drying, Mg 5.7 Fe 0.3 al 2 (OH) 16 CO 3 4H 2 O sample;

[0044] 3) Add the sample to the prepared 6 groups of potassium dichromate solutions with a concentration of 80 mg / L. After fully s...

Embodiment 2

[0047] Synthesis:

[0048] 1) Press Mg 5.4 Fe 0.6 al 2 (OH) 16 CO 3 4H 2 The stoichiometric ratio of O weighs the raw material magnesium chloride (MgCl 2 ) 1.0283g, ferrous chloride (FeCl 2 ) 0.1521g, aluminum chloride (AlCl 3 ) 0.5334g, potassium hydroxide (KOH) 1.7952g and potassium carbonate (K 2 CO 3 ) 0.2764g, in MgCl 2 , FeCl 2 , AlCl 3 Add deionized water to form a homogeneous solution A, in KOH and K 2 CO 3 Add deionized water to form a homogeneous solution B.

[0049] 2) Add solution A to solution B dropwise under magnetic stirring, and pour the resulting mixed suspension into an autoclave, preheat at 70°C for 1 hour, then raise to 180°C for 18 hours of heat treatment. Finally, after washing, suction filtration and drying, Mg 5.4 Fe 0.6 al 2 (OH) 16 CO 3 4H 2 O sample;

[0050] 3) Add the sample to the prepared 6 groups of potassium dichromate solutions with a concentration of 90 mg / L. After fully stirring, take the supernatant of one group at in...

Embodiment 3

[0053] Synthesis:

[0054] 1) Press Mg 4.8 Fe 1.2 Al 2 (OH) 16 CO 3 4H 2 The stoichiometric ratio of O weighs raw material magnesium nitrate (Mg(NO 3 ) 2 ) 1.4208g, ferrous chloride (FeCl 2 ) 0.3042g, aluminum nitrate (Al(NO 3 ) 3 9H 2 O) 1.5005g, sodium hydroxide (NaOH) 1.28g and potassium carbonate (K 2 CO 3 ) 0.2764g, in Mg(NO 3 ) 2 , FeCl 2 , Al(NO 3 ) 3 9H 2 Add deionized water to O to form a homogeneous solution A, in NaOH and K 2 CO 3 Add deionized water to form a homogeneous solution B.

[0055] 2) Add solution A to solution B dropwise under magnetic stirring, and pour the resulting mixed suspension into an autoclave, preheat at 80°C for 1 hour, then raise to 150°C for 12 hours of heat treatment. Finally, after washing, suction filtration and drying, Mg 4.8 Fe 1.2 Al 2 (OH) 16 CO 3 4H 2 O sample;

[0056] 3) Add the sample to the prepared 6 groups of potassium dichromate solutions with a concentration of 100 mg / L. After fully stirring, take ...

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PUM

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Abstract

The invention relates to a preparation method and an application of a hydrotalcite-like compound for adsorbing and reducing heavy metals. The preparation method concretely comprises the following steps: a) weighing all raw materials according to the stoichiometric ratio of an object having a general formula of Mg6-xFexAl2(OH)16CO3.4H2O (x = 0.3-1.2), adding deionized water into a magnesium raw material, an iron raw material and an aluminum raw material to form a solution A, and adding deionized water into alkali metal and carbonate raw materials to form a solution B; b) dropwise adding the solution A to the solution B, pouring the formed mixed suspension into an autoclave, heating the autoclave to 120-180 DEG C, performing heat treatment, and performing suction filtration, washing and drying to form a Mg6-xFexAl2(OH)16CO3.4H2O sample; and c) adding the sample into a potassium dichromate solution, taking the obtained supernatant and testing the adsorption rate of the supernatant every 2h, and detecting the Cr (VI)reduction degree of the material. Iron magnesium aluminum hydrotalcite prepared in the invention has good adsorption capability to heavy metals, and can be recycled through the reduction and separation of Fe<2+> on the heavy metals. The method has the advantages of simplicity in operation, high adsorption and reduction efficiency, low cost and no secondary pollution.

Description

technical field [0001] The present invention relates to the preparation and application of a Fe-Mg-Al hydrotalcite for the absorption and reduction of heavy metals, specifically Mg 6-x Fe x al 2 (OH) 16 CO 3 4H 2 The preparation method of O belongs to the technical field of environmental functional materials and heavy metal treatment. Background technique [0002] Chromium-containing wastewater mainly comes from industries such as mining, metallurgy, electroplating, tanning and dichromate production. If the chromium slag produced in industrial production is piled up in the open air and soaked by rain and snow, the contained chromium will be dissolved and infiltrated into groundwater or into rivers and lakes, which will seriously pollute the environment. Among the types of heavy metal pollution, chromium pollution ranks second. The toxicity of chromium is related to its valence state. Chromium in the environment mainly exists in two valence states of Cr(III) and Cr(VI)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08C01F7/00C01G49/00C02F1/28C02F1/70C02F101/22
CPCB01J20/08C01G49/009C02F1/281C02F1/70C01P2002/85C01P2002/72C02F2101/22C01F7/782
Inventor 张文涛周东升严桂林陈显飞张佩聪王益群
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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