Research update on Preparation and Modification of Biochar from Crop Residues
Biochar,as a new type of green material,has a wide range of application prospects.Crop residues is directly burned or discarded in large quantities in China.In order to realize the resource utilization and improve the environment as a high-performance adsorption material,this paper reviewed the main preparation methods of biochar from crop residues including pyrolysis,hydrothermal carbonization,microwave and gasification,and studied the pyrolysis mechanism.Various modification methods were used to improve the adsorption properties of biochar for changing its pore structure,the number of surface functional groups and increasing the number of adsorption sites.The research status of biochar in wastewater treatment,soil improvement and clean energy was summarized.It provides ideas for agricultural biochar to play a better role in practical application.
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