作 者：
Chen Xue-jiao;Lin Qi-mei;Rizwan, Muhammad;Zhao Xiao-rong;Li Gui-tong
单 位：
China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China;Minist Educ, Key Lab Plant Soil Interact, Minist Agr, Key Lab Arable Land Conservat North China, Beijing 100193, Peoples R China
关键词：
crop straws;steam explosion;biochar;characterization
摘 要：
Five crop straws (wheat, rice, maize, oil-rape, and cotton) were first steam-exploded for 2 min at 210 degrees C, 2.5 MPa and then pyrolyzed at 500 degrees C for 2 h. Steam explosion (SE) induced 47-95% and 5-16% reduction of hemicellulose and cellulose, respectively, in the crop straws. The biochars derived from SE-treated feedstocks had a lower specific surface area (SSA) and pore volume, compared to those from pristine feedstocks, with one exception that SE enhanced SSA of oil-rape straw biochar by approximately 16 times. After SE, biochars had significant higher anion exchange capacity (AEC) (6.88-11.44 cmol kg(-1)) and point of zero net charges (PZNC) (pH 3.61-5.32) values. It can thus be speculated that these biochars may have higher potential for anions adsorption. In addition, oil-rape straw might be suitable to SE pretreatment for preparing biochar as a soil amendment and sorbent as well. Further work is required for testing its application in soil.
