文献类型：期刊文献

英文题名：Highly concentrated amino-modified biochars using a plasma: Evolution of surface composition and porosity for heavy metal capture

作者：Hu, Rui[1,2] Xiao, Jiang[3] Wang, Tianhui[1,4] Gong, Yi[1,2] Chen, Guangcai[3] Chen, Lin[1,2] Tian, Xingyou[1,2]

第一作者：Hu, Rui

通信作者：Hu, R[1];Tian, XY[1]

机构：[1]Chinese Acad Sci, Inst Solid State Phys, Hefei 230031, Peoples R China;[2]Chinese Acad Sci, Key Lab Photovolta & Energy Conservat Mat, Hefei 230031, Peoples R China;[3]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China;[4]Univ Sci & Technol China, Hefei 230036, Peoples R China

年份：2020

卷号：168

起止页码：515-527

外文期刊名：CARBON

收录：;EI(收录号：20203209011852);Scopus(收录号：2-s2.0-85088899537);WOS:【SCI-EXPANDED(收录号:WOS:000565904500009)】；

基金：This work was supported by the National Natural Science Foundation of China (grant number 21875257), the CAS Pioneer Hundred Talents Program, and the CASHIPS Director's Fund, China (grant number YZJJ2018QN20). The authors also gratefully acknowledge partially support from the China Postdoctoral Science Foundation (2018M640200, 2019T120154).

语种：英文

外文关键词：Surface modification; Plasma treatment; Micropore generation; Compositional evolution; Enhanced heavy metal uptake

摘要：Highly concentrated amino group-modified biochars derived from twelve biomass residuals are achieved using a two-step radio-frequency Ar/NH3 plasma. The dependence of amino number, N bonding states, surface defects on the pretreatment time of Ar plasma, post-treatment power, duration and gas ratio are well established. For bamboo-biochar, the amino number and N content reach the maximum (8.04 x 10(16)/mg of biochar, 8.84 at.%) at 8.0% NH3 in NH3/Ar, presenting a highly consistent variation tendency with the emission intensity of NH radical. Notably, micropores can be created in matrix by the processing of plasma in moderate conditions, i.e., a given pretreatment time (e.g., 12.5 min), specific gas ratios of post-treatment (>= 50% of NH3) at high RF power (e.g., 240 W) and proper duration (<= 15.0 min). The uptake capacities of Pb(II) (123.1 mg g(-1)), Cu(II) (98.5 mg g(-1)) and Cd(II) (61.2 mg g(-1)) on aminated biochars are 5.42, 5.38 and 7.56 times higher than those on raw biochars. This study shows attractive prospects for the fundamental research in powder modification as well as potentials in environmental management. (C) 2020 Elsevier Ltd. All rights reserved.