文献类型：期刊文献

英文题名：Exploring different mechanisms of biochars in removing hexavalent chromium: Sorption, reduction and electron shuttle

作者：Wan, Jiang[1];Liu, Fang[2];Wang, Gehui[1];Liang, Weiyu[1];Peng, Cheng[1];Zhang, Wei[1];Lin, Kuangfei[1];Yang, Jie[2]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Acad Environm Sci, State Environm Protect Engn Ctr Urban Soil Contam, Shanghai 200233, Peoples R China

年份：2021

卷号：337

外文期刊名：BIORESOURCE TECHNOLOGY

收录：;EI(收录号：20212510523402);WOS:【SCI-EXPANDED(收录号:WOS:000684298200005)】；

基金：This research was supported by the projects of the National Key Research and Development Program of China (2019YFC1805200, 2018YFC1800600); the National Natural Science Foundation of China (41877124, 21737005).

语种：英文

外文关键词：Biochar; Biomass constituent; Hexavalent chromium; Two compartment model; Transfer electron

摘要：The role of different biochars in Cr(VI) removal process is not clear. Two raw materials with distinct components were prepared into biochars at various pyrolysis temperatures. The biochar derived from cotton stark (with less lignin than walnut shell) always had more surface functional groups. The pyrolysis temperature had a significant effect on the biochar. In the sorption experiments, the fitting results of two compartment models showed that slow compartment dominated by surface functional groups plays a leading role in the Cr(VI) removal by lowtemperature char, while the contribution of the rapid or slow compartment to the process of high-temperature char was equal. In the experiment of biochar mediated the lactate to reduce Cr(VI), the biochar derived from walnut shell (richer lignin) had better conductivity due to its highly aromatic structure, which could directly transfer electrons. This study indicated that various biochars may play different roles in the Cr(VI) removal process.