Preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal

A biochar and pickling technology, which is applied in the field of contaminated soil remediation, can solve the problems of affecting the reduction effect of CrCr and hindering the reduction reaction, so as to increase the surface activity site of the target product, facilitate the reduction, and increase the content of carboxyl and hydroxyl groups Effect
CN110217775AActive Publication Date: 2019-09-10CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
Publication Date
2019-09-10

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Abstract

The invention provides a preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal. The preparation method comprises the following steps: 1) crushing, grinding and drying a biomass raw material; 2) carrying out soaking treatment on the dried biomass into a blended soaking solution, and carrying out centrifugal dehydration drying; 3) putting charcoal into an acid solution, carrying out stirring at a uniform speed at the room temperature, and carrying out centrifugal dehydration drying so as to obtain acid pickled charcoal; 5) under protection of an argon environment, putting the acid pickled charcoal into an iron solution, carrying out stirring for 1 hour at the room temperature, and dropping a NaBH4 solution to carry out a reaction; and 6) after the reaction is completed, carrying out centrifugal dehydration drying, so as to obtain the acid pickled ZVI modified charcoal. The acid pickled ZVI modified charcoal prepared by using the preparation method has a remarkable repairing effect on heavy metal Cr (VI) polluted soil, is capable of effectively reducing the content of Cr (VI) in the soil, and in addition is capable of effectively degrading bio-availability and migration of chromium in the soil.
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Description

Technical field

[0001] The invention belongs to the technical field of contaminated soil remediation, and specifically relates to a preparation method and application of pickling ZVI modified biochar. Background technique

[0002] Soil heavy metal pollution refers to the excess of various heavy metal elements in the soil, exceeding the limit value that the soil can bear. Excessive heavy metals have a great impact on the self-circulation capacity of the soil. According to statistics, the area of ​​polluted soil in my country currently reaches 50 million mu. The heavy metal elements in the soil mainly include mercury, cadmium, lead, chromium, zinc, copper and other elements. In recent years, the content of heavy metal elements in the soil has gradually increased. Studies have shown that the average content of chromium (Cr) in soil in China has reached 78.94 mg / kg, which is significantly higher than the background value of 57.30 mg / kg. Soil Cr pollution must be paid more attention....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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