文献类型：期刊文献

英文题名：Surface modification of pitch-based spherical activated carbon by CVD of NH₃ to improve its adsorption to uric acid

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

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

年份：2008

卷号：254

期号：21

起止页码：6701

外文期刊名：APPLIED SURFACE SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000258997700002)】；

基金：This work was supported by Nature Science Foundation of China (No. 50672025 and No. 50730003), Science and Technology Commission of Shanghai Municipality (No. 06JC14018 and No. 06DZ22003), and National High Technology Research and Development Program of China (No. 2007AA05Z311).

语种：英文

外文关键词：activated carbon; chemical vapor deposition (CVD); surface properties; adsorption; uric acid

摘要：Surface chemistry of pitch-based spherical activated carbon (PSAC) was modified by chemical vapor deposition of NH(3) (NH(3)-CVD) to improve the adsorption properties of uric acid. The texture and surface chemistry of PSAC were studied by N(2) adsorption, pHPZC (point of zero charge), acid-base titration and Xray photoelectron spectroscopy (XPS). NH(3)-CVD has a limited effect on carbon textural characteristics but it significantly changed the surface chemical properties, resulting in positive effects on uric acid adsorption. After modi. cation by NH(3)-CVD, large numbers of nitrogen-containing groups (especially valley-N and center-N) are introduced on the surface of PSAC, which is responsible for the increase of pHPZC, surface basicity and uric acid adsorption capacity. Pseudo-second-order kinetic model can be used to describe the dynamic adsorption of uric acid on PSAC, and the thermodynamic parameters show that the adsorption of uric acid on PSAC is spontaneous, endothermic and irreversible process in nature. (C) 2008 Published by Elsevier B. V.