期刊
CHEMICAL ENGINEERING JOURNAL
卷 139, 期 3, 页码 462-468出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2007.08.013
关键词
multiwalled carbon nanotubes; chemical oxidation; surface functional groups; Zn2+ sorption
Multiwalled carbon nanotubes (MWCNTs) were oxidized by mixed HNO3/H2SO4 (3N+1S), HNO3, KMnO4 and NaClO and were selected as sorbents to study their characterization and isotherm of Zn2+ sorption in an aqueous solution. The physicochemical properties of MWCNTs were improved after oxidation, which made MWCNTs possess not only a more hydrophilic surface but also a more negatively charged surface, and consequently resulted in sorption of more Zn2+. The maximum Zn2+ sorption capacities of MWCNTs, MWCNTs(3N+1S), MWCNTs(HNO3), MWCNTs(KMnO4) and MWCNTs(NaClO) calculated by Langmuir model are 10.21, 18.14, 27.20, 28.01 and 32.68 mg g(-1), respectively. The MWCNTs(NaClO) have the best sorption performance of Zn2+ and their sorption kinetics was found to follow the pseudo second-order rate law. (C) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据