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Modified attapulgite, and preparation method and application thereof

An attapulgite and modified technology, which is applied in the field of soil remediation, can solve the problems of unfavorable trivalent chromium fixation, lower soil pH, and excessive dosage, so as to maintain soil fertility and productivity, improve soil environment, and increase the ability to absorb heavy metals Effect

Inactive Publication Date: 2020-04-10
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reducing agents have a reducing effect on hexavalent chromium, but there are also some unavoidable shortcomings, such as: lowering soil pH, which is not conducive to the fixation of trivalent chromium; in order to achieve a better repair effect, it must be added in excess, which may lead to Secondary pollution; high cost, not conducive to promotion, etc.

Method used

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  • Modified attapulgite, and preparation method and application thereof
  • Modified attapulgite, and preparation method and application thereof
  • Modified attapulgite, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A modified attapulgite of the present invention is prepared from natural powdery attapulgite through heat modification, acid modification and tea extract modification.

[0051] In this embodiment, the tea extract is specifically a green tea extract.

[0052] A preparation method of the above-mentioned modified attapulgite of the present embodiment, comprising the following steps:

[0053] (1) Pass the powdered attapulgite through a 200-mesh sieve, then put it into a tube furnace, and calcinate at 300° C. for 2 hours to obtain thermally modified attapulgite. The heat modification process can remove the adsorption water, zeolite water and crystallization water in the attapulgite.

[0054] (2) Prepare 3mol / L HCl solution: Measure 25mL of concentrated hydrochloric acid (36%-38% in mass fraction) into 50mL of deionized water, dilute to 100mL, and stir well to obtain HCl solution.

[0055] Weigh 10g of the thermally modified attapulgite in step (1) and add it to 100mL of HC...

Embodiment 2

[0069] An application of the modified attapulgite of the present invention in repairing chromium-contaminated soil, using the modified attapulgite prepared in Example 1, the application process is basically the same as that of Example 1, the only difference is that when applied, the modified attapulgite The mass ratios of palygorskite, unmodified attapulgite and soil samples were all 1:20.

[0070] Detection of hexavalent chromium content and chromium form in soil:

[0071] Detection method is identical with embodiment 1, and result is as Figure 5 , Figure 6 As shown, the content of hexavalent chromium in the soil repaired by modified attapulgite decreased by 28.5%, and the content of hexavalent chromium in soil repaired by unmodified attapulgite decreased by 23.9%; reduced by 0.50%, reducible chromium increased by 1.5%, oxidizable chromium decreased by 1.9%, and residual chromium increased by 0.8%; unmodified attapulgite repaired soil weakly acid-extractable chromium decr...

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Abstract

The invention discloses a modified attapulgite, and a preparation method and an application thereof. The modified attapulgite is prepared from attapulgite through thermal modification, acid modification and tea extract modification. The preparation method comprises the following steps: calcining attapulgite at a high temperature, acidifying the attapulgite to obtain acid-modified attapulgite, extracting tea leaves with an organic solvent to obtain a tea extract, and soaking the acid-modified attapulgite with the tea extract to obtain the modified attapulgite. The modified attapulgite has the advantages of good reducibility, no secondary pollution, reduction of the content of hexavalent chromium, good changing of the existence form of chromium in soil, improvement of the activity of enzymesin the soil, improvement of the soil environment, and realization of effective remediation of chromium-contaminated soil, and the preparation method has the advantages of easiness in operation, low cost, low energy consumption and easiness in promotion.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and relates to an adsorption reducing agent and its preparation method and application, in particular to a modified attapulgite, its preparation method and its application in chromium-contaminated soil. Background technique [0002] Land resources are the material basis for the survival and development of human beings, and the quality of soil is related to social security. Different from heavy metal pollution in the atmosphere and water, heavy metal pollution in soil is concealed, long-term and irreversible, and it is difficult to be directly detected by the senses. Among them, the problem of chromium polluted soil is more prominent. Because hexavalent chromium is carcinogenic and highly toxic (more than 100 times more toxic than trivalent chromium), it is listed as one of the eight most harmful chemicals to humans. The methods currently used for the remediation of chromium-contaminated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 文嘉王倩胡小红邢浪晏才雅曾光明
Owner HUNAN UNIV
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