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- Title
Characteristics of Cadmium(II) Adsorbed by the Extracellular Polymeric Substance Extracted from Waste-Activated Sludge After Short-Time Aerobic Digestion.
- Authors
Zhang, Zhiqiang; Zhang, Jiao
- Abstract
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 Cd 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 Cd/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 Cd was the major mechanism.
- Subjects
ADSORPTION (Biology); CADMIUM; EXTRACELLULAR fluid; POLYMERIC composite testing; SLUDGE management; AEROBIC conditions (Biochemistry)
- Publication
Water, Air & Soil Pollution, 2014, Vol 225, Issue 2, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-013-1850-4