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《Environmental Science & Technology》 2017-01
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Microscopic Morphology and Surface Features of Biochars Derived from Different Raw Materials

WANG Tongtong;WANG Xiaolin;REN Zhisheng;ZHENG Jiyong;School of Natural Resources and Environment, Northwest A&F University;The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS;  
Five raw materials:Sophora japonica skin,sawdust,apple branch,corn stalk,and miscellaneous wood were selected for producing biochars through pyrolysis without oxygen supply.The microscopic morphology of biochar were characterized by SEM,the specific surface area and pore size distribution was measured using the method of BET with nitrogen adsorption,and the pore size distribution of BJH equation was investigated based on adsorption-desorption isotherms.The microscopic morphology and surface features of above-mentioned five kinds of biochar were comparatively analyzed in order to provide scientific basis for further study.Findings of the study revealed that five different kinds of biochar had their own porous structures in terms of size and shape,as well as specific surface area due to the different raw materials;the biochar derived from miscellaneous wood had the largest specific surface area(17.807 m~2/g),while the biochar derived from apple branch had the minimum(1.674 m~2/g);and with decreases of the pore volume and pore diameter of the biochars,the specific surface areas of them increased.In addition,the adsorption-desorption isotherms of three biochars(Sophora japonica skin,sawdust,corn stalk) was type Ⅲ belonging to agglomerate formation,on the other hand the biochars of apple branch and miscellaneous wood was type Ⅳ.The pore diameters of the five biochars ranged widely(2 to 65 nm),featuring the size from mesopore to macropore.
【Fund】: 国家自然科学基金项目(41571225);; 教育部基本科研业务费(QN2013077 2452015250)
【CateGory Index】: X71;X72
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