New insight into adsorption characteristics and mechanisms of the biosorbent from waste activated sludge for heavy metals

查看全文 作　　者：Yun [1,2,3]Zhou;Zhiqiang [1,2]Zhang;Jiao [4]Zhang;Siqing [2]Xia

机构地区：[1]Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University;[2]State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University;[3]Swette Center for Environmental Biotechnology, Arizona State University;[4]School of Civil Engineering and Transportation, Shanghai Technical College of Urban Management

出　　处：《Journal of Environmental Sciences》索引2016年第28卷第7期,共9页

基　　金：the support provided by China Scholarship Council, Sheng Yun-Fei College Students Scientific and Technological Innovation Fund;the National Science & Technology Pillar Program (No. 2013BAD21B03) 摘　　要：The adsorption characteristics and mechanisms of the biosorbent from waste activated sludge were investigated by adsorbing Pb2+and Zn2+in aqueous single-metal solutions. A p H value of the metal solutions at 6.0 was beneficial to the high adsorption quantity of the biosorbent. The optimal mass ratio of the biosorbent to metal ions was found to be 2. A higher adsorption quantity of the biosorbent was achieved by keeping the reaction temperature below 55°C. Response surface methodology was applied to optimize the biosorption processes, and the developed mathematical equations showed high determination coefficients(above 0.99 for both metal ions) and insignificant lack of fit(p = 0.0838 and 0.0782 for Pb2+and Zn2+, respectively). Atomic force microscopy analyses suggested that the metal elements were adsorbed onto the biosorbent surface via electrostatic interaction. X-ray photoelectron spectroscopy analyses indicated the presence of complexation(between –NH2,-CN and metal ions) and ion-exchange(between –COOH and metal ions). The adsorption mechanisms could be the combined action of electrostatic interaction, complexation and ion-exchange between functional groups and metal ions. 关键词：生物吸附剂吸附机理重金属污泥 X射线光电子能谱分析原子力显微镜分析静电相互作用金属离子 PB2+

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New insight into adsorption characteristics and mechanisms of the biosorbent from waste activated sludge for heavy metals

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