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Reactivated and stabilized layered ferric hydroxide as well as preparation method and application thereof

A ferric hydroxide and reactivation technology, applied in the field of environmental remediation, can solve problems such as difficult identification, achieve the effect of optimizing mass transfer, improving the efficiency of technology use, and degrading pollutants

Inactive Publication Date: 2021-03-02
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Formation of layered iron hydroxides may be widespread in nature, but is difficult to identify due to their rapid oxidation upon exposure to oxygen

Method used

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  • Reactivated and stabilized layered ferric hydroxide as well as preparation method and application thereof
  • Reactivated and stabilized layered ferric hydroxide as well as preparation method and application thereof
  • Reactivated and stabilized layered ferric hydroxide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) sodium phosphate (Na 3 PO 4 12H 2O) be dissolved in anaerobic deionized water, adjust pH to be 8.0 by 1mol / L HCl solution, obtain the phosphate solution of 4mM, preserve under anaerobic condition for subsequent use;

[0049] (2) Under anaerobic conditions, centrifuge 5 mL of layered ferric hydroxide suspension with a concentration of 60 mM (wherein the concentration of ferrous iron salt is 30 mM), remove the supernatant and retain the precipitate, and then add 10 mL of the solution from step (1) The prepared phosphate solution was magnetically stirred at room temperature at 25° C. for 12 h, so that the phosphate radical was fully adsorbed on the surface of layered ferric hydroxide, while maintaining the pH of the system at 8.0 to obtain a phosphate-layered ferric hydroxide suspension (stabilized layer like ferric hydroxide suspension);

[0050] (3) Weigh 3.6g of sodium oxalate and dissolve it in 450mL of anaerobic deionized water to obtain a 60mmol / L sodium oxala...

Embodiment 2

[0053] Other conditions are the same as in Example 1, wherein the concentration of sodium oxalate in step (4) is 30mM.

Embodiment 3

[0055] Other conditions are the same as in Example 1, wherein the concentration of sodium oxalate in step (4) is 120mM.

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Abstract

The invention relates to the technical field of environmental remediation, in particular to reactivated and stabilized layered ferric hydroxide as well as a preparation method and application thereof.Active sites on the surface of layered ferric hydroxide are passivated through an oxygen-enriched acid stabilizer, dissolution of structural ferrous irons inhibited, and a stabilized layered ferric hydroxide suspension is obtained; and the layered ferric hydroxide isdissolved by using an organic acid complexing agent, and the active sites arereleased to obtain reactivated and stabilized layered ferric hydroxide. According to the method, the layered ferric hydroxide is stabilized through the oxygen-enriched acid stabilizer, divalent iron with reduction activity is prevented from being lost, the active sites are restarted through the organic acid complexing agent, active release of the layered ferric hydroxide in a complex environment medium can be better controlled, activity regulation andcontrol are achieved, and a new thought is provided for soil and underground water remediation.

Description

technical field [0001] The invention relates to the technical field of environmental remediation, in particular to a reactivated and stabilized layered ferric hydroxide and a preparation method and application thereof. Background technique [0002] Layered iron hydroxide, also known as green rust, is a layered iron oxide containing ferrous and ferric cations. It belongs to the double-layer metal hydroxide family and has strong chemical reduction activity. It can reduce nitrate, Contaminants such as nitroaromatics and chlorinated solvents. The excellent reduction activity of layered iron hydroxide is attributed to its high content of structural ferrous iron, and the polaron hopping between ferrous iron and ferric iron in the iron hydroxide flakes enables fast electron transfer. Formation of layered iron hydroxides may be widespread in nature, but they are difficult to identify due to their rapid oxidation upon exposure to oxygen. [0003] For the use of layered ferric hydro...

Claims

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Application Information

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IPC IPC(8): C02F1/70B09C1/00B09C1/08C02F103/06C02F101/36
CPCC02F1/70B09C1/002B09C1/08C02F2103/06C02F2101/36
Inventor 殷炜昭陈风敏赵锦欣
Owner JINAN UNIVERSITY
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