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Soil arsenic and chromium pollution remediation agent based on organoclay-loaded nano-iron system

A repairing agent and nano-iron technology, which is applied in the field of organoclay-loaded nano-iron-based composite repairing agents, can solve problems such as accurate qualitative and quantitative analysis, singleness, etc., and achieve the effects of improving repairing effect, low price, and reducing leaching hazards.

Active Publication Date: 2020-07-03
上海建科环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering that the pollution forms of arsenic and chromium in the actual polluted soil are unlikely to be single, it is difficult to conduct accurate qualitative and quantitative analysis of the environmental forms of arsenic and chromium in the soil before the actual soil remediation. Reduce the hazards of highly toxic arsenic and chromium in soil (such as trivalent arsenic and hexavalent chromium), while taking into account the stabilization effect of other forms of arsenic and chromium (need to be combined with other stabilizing agents for non-selective treatment) is a real problem that needs to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1-montmorillonite template:

[0031] Prepare trivalent arsenic, pentavalent arsenic, trivalent chromium and hexavalent chromium contaminated soil with a concentration of 200mg / Kg, add the agent according to the ratio of montmorillonite:soil weight ratio of 1:10, mix well and add soil quality 10% water. After 72 hours of curing, the soil was tested for toxicity leaching. It was found that compared with the soil without stabilizers, the stabilization efficiencies of trivalent arsenic, pentavalent arsenic, trivalent chromium and hexavalent chromium were 23.4 and 23.4 respectively. 25.8, 39.6, 18.3%, with an overall stabilization efficiency of 26.8% for all metals.

Embodiment 2

[0032] Embodiment 2-organic montmorillonite:

[0033] According to the dosage of montmorillonite 40g / L, drop into the aqueous solution containing tetradecyltrimethylammonium bromide, the content of tetradecyltrimethylammonium bromide is 2 times of the cation exchange capacity of montmorillonite, After mixing and reacting for 6 hours, organomontmorillonite was obtained.

[0034] Prepare trivalent arsenic, pentavalent arsenic, trivalent chromium and hexavalent chromium contaminated soil with a concentration of 200mg / Kg, add the agent according to the ratio of organic montmorillonite:soil weight ratio of 1:10, mix well and add to the soil 10% water by mass. After 72 hours of curing, the soil was tested for toxicity leaching. The results showed that compared with the soil without stabilizers, the stabilization efficiencies of trivalent arsenic, pentavalent arsenic, trivalent chromium and hexavalent chromium were 42.8, 49.9, 40.2, 68.4%, with an overall stabilization efficiency o...

Embodiment 3

[0035] Example 3 - No organic modification of montmorillonite loaded nano-iron:

[0036] Add montmorillonite particles to deionized water to make the concentration reach 40g / L, add FeCl to the suspension system 3 solution until its concentration reaches 0.3M, mix for about 18 hours, centrifuge to discard the supernatant, and repeat the above process 2 times. The solid particles obtained above were put into deionized water, and the pH of the solution was adjusted to 3 with 0.5M hydrochloric acid, and the NaBH 4 (Sodium borohydride) is quickly added to the particle slurry (NaBH 4 The molar ratio with Fe is 45:1), reacted at room temperature for 5 minutes, and after centrifugal drying, component A without organic modification was obtained.

[0037] According to the dosage of montmorillonite 60g / L, add 0.6M FeCl to the montmorillonite particles 3 solution, mixed for about 18 hours, centrifuged to discard the supernatant, and repeated the above process 2 times. Use 0.5M hydroch...

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Abstract

The invention discloses a soil arsenic and chromium pollution repairing agent based on an organoclay-loaded nano iron series. The repairing agent is prepared by mixing 55-85% of organic montmorillonite-loaded nano zero-valent iron and 15-45% of organic montmorillonite-loaded nano iron oxide by weight, wherein the organic montmorillonite-loaded nano zero-valent iron is obtained by reduction of nanozero-valent iron on iron-based montmorillonite particles and then organic modification; the organic montmorillonite-loaded nano iron oxide is obtained through organic modification of iron-based montmorillonite and then oxidation into nano iron oxide.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to an organoclay-loaded nano-iron-based composite material remediation agent for remediation of heavy metal arsenic and chromium-contaminated soil. Background technique [0002] Soil is the material basis for sustainable economic and social development. It is related to the health of the people and the construction of a beautiful China. Protecting the soil environment is an important part of promoting the construction of ecological civilization and maintaining national ecological security. At present, the overall situation of my country's soil environment is worrying, and some areas are seriously polluted. Among them, heavy metal pollution in soil is an important type of pollution, mainly caused by industrial three wastes, agricultural irrigation, application of chemical fertilizers and pesticides, and long-term emission of automobile exhaust. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08C09K109/00
CPCB09C1/08C09K17/40C09K2109/00
Inventor 蒋小红喻恺蒋卫刚俞军欢
Owner 上海建科环境技术有限公司
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