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Modified layered double hydroxide supported acetal cross-linked microporous bimetallic Cr(VI) removal filler preparation method

A hydroxide, bimetallic technology, applied in chemical instruments and methods, other chemical processes, contaminated groundwater/leachate treatment, etc., can solve the problems of low reaction utilization rate, slow reaction rate, easy agglomeration, etc. Significant environmental benefits, simple production method, and overcoming the effect of easy reunion

Active Publication Date: 2019-05-24
CHINESE ACAD OF ENVIRONMENTAL PLANNING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the defects of low utilization rate, slow reaction rate, easy agglomeration, passivation and high cost of the reaction between zero-valent iron and Cr(VI), and provide a modified layer with high efficiency, economical feasibility and convenient use Preparation method of bimetallic hydroxide-supported acetal cross-linked microporous bimetallic filler for removing Cr(Ⅵ)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix polyvinylpyrrolidone and carrageenan into 100mL water at the mass concentration of 0.01g / mL and 0.01g / mL respectively, and add 10mL of glutaraldehyde with a mass concentration of 0.01g / mL dropwise under the stirring condition of a magnetic heating stirrer solution and 5g of powdered activated carbon through a 200-mesh standard sieve, and adjust the pH of the solution to 6.5 with a 0.1mol / L concentration hydrochloric acid solution, and cool to normal temperature after reacting for 25min for use;

[0026] (2) Wash the iron powder with hydrochloric acid with a concentration of 0.05mol / L for 2 minutes, then wash it with water until neutral, then put the cleaned iron powder into a freeze dryer to dry, and pass the dried iron powder through a 200-mesh standard sieve , take the sieved iron powder for later use;

[0027] (3) Add 1g of iron powder treated in step (2) to the 100mL mixed solution prepared in step (1), mix well and set aside;

[0028] (4) Add 0.02g CuCl to...

Embodiment 2

[0040] (1) Mix polyvinylpyrrolidone and carrageenan into 100mL water at the mass concentration of 0.02g / mL and 0.03g / mL respectively, and add 10mL of glutaraldehyde with a mass concentration of 0.01g / mL dropwise under the stirring condition of a magnetic heating stirrer solution and 5g of powdered activated carbon that passed through a 200-mesh standard sieve, and adjusted the pH of the solution to 6.5 with a 0.1mol / L hydrochloric acid solution, reacted for 30min and cooled to normal temperature for use;

[0041] (2) Wash the iron powder with hydrochloric acid with a concentration of 0.08mol / L for 4 minutes, then wash it with water until neutral, then put the cleaned iron powder into a freeze dryer to dry, and pass the dried iron powder through a 200-mesh standard sieve , take the sieved iron powder for later use;

[0042] (3) Add 2g of iron powder treated in step (2) to the 100mL mixed solution prepared in step (1), mix well and set aside;

[0043] (4) Add 0.04g CuCl to the ...

Embodiment 3

[0054] (1) Mix polyvinylpyrrolidone and carrageenan into 100mL of water at a mass concentration of 0.03g / mL and 0.04g / mL respectively, and add 10mL of glutaraldehyde with a mass concentration of 0.01g / mL dropwise under the stirring condition of a magnetic heating stirrer solution and 5g of powdered activated carbon crossing a 200-mesh standard sieve, and adjust the pH of the solution to 6.5 with a 0.1mol / L concentration hydrochloric acid solution, and cool to normal temperature after reacting for 50min for use;

[0055] (2) Wash the iron powder with hydrochloric acid with a concentration of 0.4mol / L for 5 minutes, then wash it with water until neutral, then put the cleaned iron powder into a freeze dryer to dry, and pass the dried iron powder through a 200-mesh standard sieve , take the sieved iron powder for later use;

[0056] (3) Add 10g of iron powder treated in step (2) to the 100mL mixed solution prepared in step (1), mix well and set aside;

[0057] (4) Add 0.21g CuCl ...

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Abstract

The invention discloses a modified layered double hydroxide supported acetal cross-linked microporous bimetallic Cr(VI) removal filler preparation method. By a product prepared according to the method, on the basis that problems of low utilization rate and proneness to agglomeration and passivation in reaction of iron powder and Cr(VI) are effectively solved, a layered double hydroxide is introduced to further remarkably improve the Cr(VI) removal performance of filler, and the filler cost is sharply reduced. The Cr(VI) absolute removal rate of the filler is increased by 3.27 times or above ascompared with that of calcium alginate fixed bimetallic Cr(VI) removal filler, the reaction speed is remarkably increased as compared with that of the calcium alginate fixed bimetallic Cr(VI) removalfiller, filler cost is reduced by 70% as compared with that of the calcium alginate fixed bimetallic Cr(VI) removal filler, and high environmental benefits, economic benefits and social benefits areachieved.

Description

technical field [0001] The invention relates to the technical field of groundwater Cr(VI) pollution restoration, in particular to a preparation method of a modified layered bimetallic hydroxide loaded acetal cross-linked microporous bimetal Cr(VI)-removing filler. Background technique [0002] The remediation of Cr(VI)-contaminated groundwater usually adopts extraction-surface chemical treatment method, but there are disadvantages such as high cost, long cycle, high energy consumption, and easy to cause secondary pollution of groundwater. In recent years, zero-valent iron PRB technology has rapidly emerged due to its advantages of low energy consumption and no secondary pollution. x Cr 1-x )(OH) 3 Precipitation attached to the surface of zero-valent iron hinders the further reaction between zero-valent iron and Cr(Ⅵ), leading to the passivation of zero-valent iron, so that the utilization rate is extremely low. At the same time, these precipitates generated on the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28C02F103/06
Inventor 朱文会何军王夏晖李志涛何俊王宁
Owner CHINESE ACAD OF ENVIRONMENTAL PLANNING
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