A kind of modified biochar and its preparation method and application

A biochar modification technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of environmental secondary pollution, cumbersome preparation process, high cost, etc., and achieve strong heavy metal adsorption capacity and low raw material price Cheap and easy to obtain, the effect of low modification cost
CN109821501BActive Publication Date: 2022-03-15HUNAN AGRICULTURAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN AGRICULTURAL UNIV
Publication Date
2022-03-15

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Abstract

The invention discloses a modified biochar and its preparation method and application. The preparation method of the modified biochar is as follows: 1. Drying and pulverizing camellia oleifera husks to obtain camellia oleifera husk powder; 2. Shell powder and sodium silicate are added to water, stirred, centrifuged, filtered, and the filter residue is dried to obtain a mixed solid; 3. Under a nitrogen atmosphere, the mixed solid is pyrolyzed, and the heating rate during pyrolysis is 8-12°C / min, heat up to 500°C, maintain this temperature for pyrolysis for 120min, cool to room temperature, and pulverize to obtain carbonized powder; 4. Wash the carbonized powder with dilute hydrochloric acid and absolute ethanol in sequence, and then wash with water until the filtrate is neutral , and then dried to obtain the modified biochar. The modified biochar has good adsorption performance, can be used as an adsorbent for heavy metals, and especially has a high removal rate for metal cadmium. The preparation method is simple, the operation is convenient and the yield is high.
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Description

technical field

[0001] The invention belongs to the technical field of environmental protection material engineering, and in particular relates to a modified biochar and its preparation method and application. Background technique

[0002] In recent years, due to natural and human activities such as mining, production, smelting, and improper application of chemical fertilizers and pesticides in agriculture, heavy metal pollution in agricultural soil has become a serious and common environmental problem, and has gradually evolved into a social problem .

[0003] The rate of heavy metals exceeding the standard in agricultural soil in my country is as high as 10.18%. Hunan Province, as the hometown of non-ferrous metals, is particularly serious in farmland soil heavy metal pollution, among which Cd is the most typical. Soil heavy metal pollution control and remediation is imperative for food safety and social harmony and stability. Studies have shown that heavy metal pollutio...

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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