文献类型：期刊文献

英文题名：Modification of polystyrene-based activated carbon spheres to improve adsorption of dibenzothiophene

作者：Wang, Qin[1];Liang, Xiaoyi[1];Qiao, Wenming[1];Liu, Chaojun[1];Liu, Xiaojun[1];Zhang, Rui[1];Ling, Licheng[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：255

期号：6

起止页码：3499

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20090111825912);WOS:【SCI-EXPANDED(收录号:WOS:000261972100005)】；

基金：This work was supported by the Nature Science Foundation of China (50672025 and 50730003), National High Technology Research and Development Program of China (863 Project) (2007AA05Z311) and by Program for New Century Excellent Talents in University (NCET-07-0285).

语种：英文

外文关键词：Activated carbon spheres; Modification; Dibenzothiophene; Adsorption

摘要：Polystyrene-based activated carbon spheres (PACS) were modified with either air, HNO3, (NH4)(2)S2O8, H2O2 or H-2 to improve their adsorption properties of dibenzothiophene (DBT). The texture and surface chemistry of PACS were characterized by N-2 adsorption, scanning electron microscopy (SEM), temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), acid-base titration and elemental analysis. The results showed that HNO3 and (NH4)(2)S2O8 treatments introduced large amount of acidic groups such as carboxylic, lactones and anhydride groups, while air and H2O2 had relatively mild effects and introduced a small quantity of phenol, carbonyl and ether groups. In the HNO3 treatment, the acidic groups might be fixed on the internal and external surface of PACS, which may act as active sites of adsorption, resulting in increase of the adsorption amount by 45%. Whereas H2O2 and (NH4)(2)S2O8 treatments might. x more oxygen-containing groups on the external surface, which may hinder DBT molecule enter into micropores, leading to rather lower adsorption capacity with the extent of oxidation. So, the concentration, distribution and types of the acidic functional groups are responsible for the removal of DBT. (C) 2008 Elsevier B.V. All rights reserved.