Characteristics of Cadmium(II) Adsorbed by the Extracellular Polymeric Substance Extracted from Waste-Activated Sludge After Short-Time Aerobic Digestion

被引：0
|
作者：
Zhiqiang Zhang
Jiao Zhang
机构：
[1] Tongji University,Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering
[2] Tongji University,State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering
[3] Shanghai Technical College of Urban Management,School of Civil Engineering and Transportation
来源：
Water, Air, & Soil Pollution | 2014年 / 225卷
关键词：
Adsorption; Cadmium; Extracellular polymeric substance; Waste-activated sludge; Aerobic digestion;
D O I：
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中图分类号：
学科分类号：
摘要：
The extracellular polymeric substance (EPS) extracted from waste-activated sludge after short-time aerobic digestion was investigated to be used as a novel biosorbent for Cd2+ removal from water. The sorption kinetics was well fit for the pseudo-second-order model, and the maximum sorption capacity of the EPS (430.3 mg Cd2+/g EPS) was markedly higher than those of the reported biosorbents. Both Langmuir model and Freundlich model commendably described the sorption isotherm. The Gibbs free energy analysis of the adsorption showed that the sorption process was feasible and spontaneous. According to the results of multiple analytical techniques, the adsorption process took place via both physical and chemical sorption, but the electrostatic interaction between sorption sites with the functional groups and Cd2+ was the major mechanism.
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