文献类型：期刊文献

英文题名：Unveiling the mechanisms of carbon conversion and loss in biochars derived from characteristic lignocellulosic biomass

作者：Wan, Jiang[1];Liu, Lin[1];Wang, Gehui[1];Sang, Li[1];Liang, Weiyu[1];Zhang, Wei[1];Peng, Cheng[1];Fu, Rongbing[2]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[2]Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China

年份：2022

卷号：10

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20223712709375);WOS:【SCI-EXPANDED(收录号:WOS:000860739400004)】；

基金：This research was supported by the projects of the National Key Research and Development Program of China (2019YFC1805200) ; the National Natural Science Foundation of China (41877124, 21737005) .

语种：英文

外文关键词：Biomass component; Biochar; TG-MS; Carbon retention; Carbon stability

摘要：The relationship between biomass components and carbon retention or loss in biochars is unclear. In this study, four characteristic feedstocks were pyrolyzed into biochar, and the conversion and stability of carbon in biochar were studied in detail. Thirteen kinds of ion fragments were detected by thermogravimetry -mass spectrometry (TG-MS), among which H2O, CO2 and CO were the main gas products. In addition, the presence of lignin slowed that the pyrolysis of biomass and produced more CO, which eventually led to more aromatic biochar. The carbon retention of lignin, cellulose and xylan during pyrolysis was 78.7 %, 41.7 % and 40.2 %, respectively. Carbon retention calculations showed that lignin was a major contributor to the formation of biochar (40.1-53.2 %). In the K2Cr2O7 oxidation experiment, the carbon stability of sunflower and cotton stalk char was relatively poor, which was consistent with the results of thermal stability. Spectral characterization analysis showed that biomass with low lignin content generated more unstable carbon during pyrolysis, which was more likely to be lost or converted in an oxidized environment. These findings are meaningful for guiding in biochars preparation and avoiding their environmental risks.