Improving agent of soil polluted by Si/Fe composite cadmium and preparation and application method of improving agent

A technology of cadmium-contaminated soil and improver, applied in the direction of chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of ineffective control of soil heavy metal pollution, defects in diatomite physical and chemical structure, and easy aggregation, etc., and achieve reduction Soil exchangeable cadmium content, increase soil moisture content, no secondary pollution effect

Inactive Publication Date: 2018-06-29
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Problems solved by technology

The present invention is to study the restoration of cadmium-contaminated soil with diatomite loaded with hydroxyl iron. Diatomite is a clay mineral with a huge specific surface area and numerous pores, but the natural diatomite has no effect on the control of soil heavy metal pollution. Obviously, the modification of diatomite is

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  • Improving agent of soil polluted by Si/Fe composite cadmium and preparation and application method of improving agent
  • Improving agent of soil polluted by Si/Fe composite cadmium and preparation and application method of improving agent
  • Improving agent of soil polluted by Si/Fe composite cadmium and preparation and application method of improving agent

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Embodiment Construction

[0026] The following examples are used to further illustrate the present invention, but the present invention is by no means limited to these examples.

[0027] Based on reducing the bioavailability of cadmium in the soil and maintaining the basic physical and chemical properties of the soil, the improvement agent is prepared by applying the invention.

[0028] (1) Purification of diatomite: take an appropriate amount of diatomite and grind it in a mortar, and pass through a 100-mesh nylon sieve; Soak in hydrochloric acid for 1 day, then wash several times with deionized water, then dry at 110°C for later use.

[0029] (2) Determination of the optimal preparation ratio:

[0030] A certain amount of analytically pure Fe(NO 3 ) 3 9H 2 O and analytically pure NaOH were dissolved in deionized water, and 1mol / L Fe(NO 3 ) 3 solution and 4mol / L NaOH solution, take an appropriate amount of Fe(NO 3 ) 3 9H 2 The molar ratio of O and NaOH solution is 1:0.5 to prepare modifier (h...

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Abstract

The invention discloses an improving agent of soil polluted by Si/Fe composite cadmium and a preparation and application method of the improving agent. The method comprises the following specific steps: (1) mixing Fe(NO3)3 and NaOH solution to prepare a modifier; (2) taking purified diatomite and a modifier solution, uniformly mixing, and stirring to form a muddy state; (3) baking a mixture to obtain the improving agent of the soil polluted by the Si/Fe composite cadmium. The improving agent disclosed by the invention has the beneficial effects that after the improving agent is applied into the soil polluted by cadmium according to applying amount, the content of exchangeable cadmium in the soil can be reduced by 37.5%, the water content is increased by 58.2%, and organic matters and a pHvalue are not greatly changed; the cadmium pollution to the soil can be effectively controlled, meanwhile the stability of basic physicochemical properties such as the pH value and organic matters ofthe soil can be maintained, the raw materials are low-cost and easy to obtain, the process is simple, the cost is lower, and no secondary pollution is caused.

Description

technical field [0001] The invention relates to the field of cadmium-contaminated soil improver and its preparation, in particular to a Si / Fe composite cadmium-contaminated soil improver and its preparation and application method. Background technique [0002] Soil is one of the important resources for human survival, but with the advancement of industrialization, soil cadmium pollution is becoming more and more serious. According to relevant research in recent years, there are different degrees of cadmium pollution problems in all parts of my country. At present, my country's soil cadmium pollution involves 25 regions in 11 provinces and cities. For example, the average content of cadmium in polluted soil in Antbang area of ​​Shanghai is 21.48 mg / kg, and the content of cadmium in soil in old sewage irrigation areas in the suburbs of Guangzhou is as high as 228.0 mg / kg. Most of the cadmium pollution in farmland soil in my country is caused by the sewage irrigation of indus...

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Application Information

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IPC IPC(8): C09K17/02C09K101/00
CPCC09K17/02C09K2101/00
Inventor 朱健谭蓉王平雷明婧杨雨中朱君
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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