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Preparation method of biochar with multiple heavy metal Cd adsorption sites

A technology of biochar and adsorption sites, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problem of uncontrollable grafting process and achieve the effect of increasing heavy metal adsorption sites

Inactive Publication Date: 2021-04-30
自然资源部天津海水淡化与综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of surface modification, ATRP active sites are introduced into the surface of biochar, and in situ polymerization is initiated on the surface of biochar to graft functional macromolecular brushes with Cd complexation, and ATRP polymerization is used to solve the process of existing biochar surface grafting methods uncontrollable problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing biochar with multiple heavy metal Cd adsorption sites, comprising the following steps:

[0022] (1) Preparation of biochar by pyrolysis method: corncobs were used as raw materials for preparation of biochar, which were pulverized, dried, and fired at 200 °C for 2 hours in a nitrogen atmosphere to obtain biochar with hydroxyl groups on the surface.

[0023] (2) Chemical modification of the biochar surface: using bromoisobutyryl bromide (BIBB) as a modification factor, a 10 mM BIBB n-hexane solution was prepared. 0.5 g of biochar was placed in the above solution and reacted at room temperature for 1 hour to obtain biochar with ATRP initiation sites on the surface.

[0024] (3) Biochar with rich Cd adsorption sites on the surface: use crotononitrile (CTT) as the grafted functional monomer, and the mass concentration of CTT is 0.05 mol / L. Copper and N, N, N′, N′, N″-pentamethyldiethylenetriamine were used as catalysts and reacted at room temperature ...

Embodiment 2

[0026] A method for preparing biochar with multiple heavy metal Cd adsorption sites, comprising the following steps:

[0027] (1) Preparation of biochar by pyrolysis method: corncobs were used as raw materials for preparation of biochar, which were pulverized, dried, and fired at 800 °C for 2 hours in a nitrogen atmosphere to obtain biochar with hydroxyl groups on the surface.

[0028] (2) Chemical modification of the biochar surface: using bromoisobutyryl bromide (BIBB) as a modification factor, a 10 mM BIBB n-hexane solution was prepared. 0.5 g of biochar was placed in the above solution and reacted at room temperature for 1 hour to obtain biochar with ATRP initiation sites on the surface.

[0029] (3) Biochar with rich Cd adsorption sites on the surface: use crotononitrile (CTT) as the grafted functional monomer, and the mass concentration of CTT is 0.05 mol / L. Copper and N, N, N′, N′, N″-pentamethyldiethylenetriamine (PMDETA) were used as catalysts, and reacted at room te...

Embodiment 3

[0031] A method for preparing biochar with multiple heavy metal Cd adsorption sites, comprising the following steps:

[0032] (1) Preparation of biochar by pyrolysis method: corncobs were used as raw materials for preparation of biochar, which were pulverized, dried, and fired at 550 °C for 2 hours in a nitrogen atmosphere to obtain biochar with hydroxyl groups on the surface.

[0033] (2) Chemical modification of the biochar surface: using bromoisobutyryl bromide (BIBB) as a modification factor, a 10 mM BIBB n-hexane solution was prepared. 0.5 g of biochar was placed in the above solution and reacted at room temperature for 1 hour to obtain biochar with ATRP initiation sites on the surface.

[0034] (3) Biochar with rich Cd adsorption sites on the surface: use crotononitrile (CTT) as the grafted functional monomer, and the mass concentration of CTT is 0.05 mol / L. Copper and N, N, N′, N′, N″-pentamethyldiethylenetriamine (PMDETA) were used as catalysts, and reacted at room te...

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Abstract

The invention relates to a preparation method of biochar with multiple heavy metal Cd adsorption sites. The method comprises the following steps: firstly, selecting raw materials for preparing biochar, and preparing biochar at a certain cracking temperature; then immobilizing an atom transfer radical polymerization (ATRP) initiation site on the biochar by adopting a surface chemical modification method to obtain biochar rich in the ATRP initiation site on the surface; and finally, selecting a functional monomer with Cd adsorption sites, and carrying out ATRP controllable grafting to obtain the biochar with multiple heavy metal Cd adsorption sites on the surface. Compared with an existing biochar grafting method, the biochar prepared through the method has the advantages that the types and the number of heavy metal adsorption sites on the surface are large, and the types and the number of the adsorption sites can be freely regulated and controlled.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of biochar with multiple adsorption of heavy metal Cd. Background technique [0002] Cadmium (Cd) is the most common heavy metal in the environment and is extremely harmful to the environment. Cadmium is not easily leached with water and cannot be decomposed by soil microorganisms. It remains in the surface soil, or seeps into groundwater, or diffuses to non-polluted areas with floating dust and runoff, making it difficult to be completely eliminated. Therefore, solving the problem of heavy metal cadmium pollution in soil has become one of the important scientific tasks to ensure the quality and safety of agricultural products. [0003] In recent years, biochar, as a new type of adsorbent, has the characteristics of good porosity, large specific surface area, and strong adsorption capacity, and has been widely used in the research field o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28B01J20/30C02F101/20
CPCB01J20/20B01J20/264C02F1/288C02F1/285C02F1/283C02F2101/20
Inventor 赵曼付善灿张潇泰杨扬刘铮
Owner 自然资源部天津海水淡化与综合利用研究所
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