Microscopic Morphology and Surface Features of Biochars Derived from Different Raw Materials
WANG Tongtong
WANG Xiaolin
REN Zhisheng
ZHENG Jiyong
Abstract：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 m2/g),while the biochar derived from apple branch had the minimum (1.674 m2/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.
Keywords：biocharmorphology structureBET surface areapore diameter distributiondifferent raw materials
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 42-48 )