标题：Sorption and detoxification of chromium(VI) by aerobic granules functionalized with polyethylenimine
作者：Sun, Xue-Fei; Ma, Yue; Liu, Xian-Wei; Wang, Shu-Guang; Gao, Bao-Yu; Li, Xiao-Ming
作者机构：[Sun, Xue-Fei; Ma, Yue; Wang, Shu-Guang; Gao, Bao-Yu; Li, Xiao-Ming] Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & R 更多
通讯作者地址：[Wang, SG]Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Jinan 250100, Peoples R China.
关键词：Aerobic granule; Polyethylenimine; Cr(VI); Sorption; Detoxification
摘要：This study describes the modification of aerobic granules by grafting polyethylenimine (PEI) for simultaneous sorption and detoxification of Cr(VI). After modification, the uptake capacity of modified aerobic granules (MAC) showed about 401.5 mg/g at pH 5.5 and increased by 274% compared to the control. Adsorption experiments were carried out as a function of contact time, pH and concentration of Cr(VI). It was found that the equilibrium sorption can be attained within 3 h and the process obeys the Redlich-Peterson isotherm model. The adsorption process is a function of pH of the solution, with the greater adsorption at pH 5.2. The interaction characteristics between the Cr and MAC were elucidated by applying FTIR and XPS analyses. FTIR results showed that the -NH(2) groups in the sorbent are involved in the adsorption process. XPS results verified the presence of Cr(III) on the MAC surface in the pH range 1.5-8.5, suggesting that some Cr(VI) anions were reduced to Cr(III) during the sorption. (C) 2010 Elsevier Ltd. All rights reserved.