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Silane modified biochar as well as preparation method and application thereof

A technology of silane modification and silane modifier, which is applied in the direction of chemical instruments and methods, water pollutants, and other chemical processes. Broad application prospects and moderate process conditions

Pending Publication Date: 2019-09-10
GUIZHOU MATERIAL IND TECH INSTITUE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the current biochar modification methods all need to use dangerous chemicals such as strong acid and strong alkali, which are prone to secondary pollution, and the addition amount is relatively large, so the popularization and application are limited

Method used

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  • Silane modified biochar as well as preparation method and application thereof
  • Silane modified biochar as well as preparation method and application thereof
  • Silane modified biochar as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 5g of γ-aminopropyltriethoxysilane (KH550) and disperse it in a mixed solution of 10mL ethanol and water (7:3), adjust the pH value to 4 with acetic acid, hydrolyze for 2 hours, and then change the hydrolyzed silane The agent solution and 100g tobacco rod biochar were added to the Sc-CO 2 In the reaction kettle, react at a stirring rate of 180r / min, a reaction temperature of 40°C, and a reaction pressure of 20MPa for 2 hours, then take out the reactants, wash them repeatedly with deionized water, and dry them in a vacuum oven to obtain modified biochar BC1 .

Embodiment 2

[0049] Take 5g of γ-glycidyl etheroxypropyltrimethoxysilane (KH560) and disperse it in a mixed solution of 10mL ethanol and water (7:3), adjust the pH value to 4 with acetic acid, hydrolyze for 2 hours, and then dissolve the hydrolyzed Add silane modifier solution and 100g tobacco rod biochar to Sc-CO 2 In the reaction kettle, react at a stirring rate of 180r / min, a reaction temperature of 40°C, and a reaction pressure of 20MPa for 2 hours, then take out the reactants, wash them repeatedly with deionized water, and dry them in a vacuum oven to obtain modified biochar BC2 .

Embodiment 3

[0051] Take 5g of γ-(methacryloyloxy)propyltrimethoxysilane (KH570) and disperse it in a mixed solution of 10mL ethanol and water (7:3), adjust the pH value to 4 with acetic acid, hydrolyze for 2 hours, and then Add the hydrolyzed silane modifier solution and 100 g tobacco rod biochar to the Sc-CO 2 In the reaction kettle, react at a stirring rate of 180r / min, a reaction temperature of 40°C, and a reaction pressure of 20MPa for 2 hours, then take out the reactants, wash them repeatedly with deionized water, and dry them in a vacuum oven to obtain modified biochar BC3 .

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Abstract

The invention relates to silane modified biochar as well as a preparation method and application thereof. The silane modified biochar is prepared by grafting a silane modifier to biochar in a supercritical fluid medium. The supercritical fluid medium serves as a reaction medium, and the silane modifier having different functional group structures is grafted onto the surface of the biochar, so thatadsorption activity sites on the surface of the biochar can be increased, adsorption capacity of a biochar material is improved, the contained functional groups can undergo a chelation reaction withheavy metal ions, and heavy metal adsorption stability of the biochar is improved. The modified biochar has excellent adsorption efficiency and adsorption stability on the heavy metal ions, and also has wide application prospects in the field of environmental protection. The biochar is modified in a green solvent, namely the supercritical fluid medium, use of an organic solvent is greatly reduced,the process is simple, and the silane modified biochar is environment-friendly, low in cost and capable of easily realizing large-scale popularization and application.

Description

technical field [0001] The invention relates to the field of environmental functional materials, in particular to a method, material and application for modifying biochar by using supercritical carbon dioxide. Background technique [0002] Biochar is a kind of insoluble, stable, highly aromatized, and carbon-rich solid produced by high temperature and slow pyrolysis of biological residues in the absence of oxygen. Strong ion exchange capacity can effectively adsorb heavy metals and organic pollutants in the environment. It has obvious advantages and great application potential in environmental protection, agriculture and other fields, and has become one of the current research hotspots. [0003] Due to the limited functional groups and adsorption sites on the surface of biochar, the adsorption selectivity for heavy metals is poor, so its adsorption performance and adsorption stability for heavy metals and organic pollutants are greatly limited, and it is difficult to meet th...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/22B01J20/30C02F1/283C02F2101/20
Inventor 徐国敏张华黄国培薛斌张兵兵杨照陆永兴滕东晔
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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