Adsorption of Cu2+ and Zn2+ by extracellular polymeric substances (EPS) in different sludges: Effect of EPS fractional polarity on binding mechanism
Adsorption of Cu2+ and Zn2+ by extracellular polymeric substances (EPS) in different sludges: Effect of EPS fractional polarity on binding mechanism
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不同污泥中胞外聚合物 (EPS) 对 Cu2 和 Zn2 的吸附：EPS 分数极性对结合机制的影响
DOI：
10.1016/j.jhazmat.2016.05.016
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发表时间：
2017-01-05
影响因子：
13.6
通讯作者：
Cui, Fuyi
中科院分区：
文献类型：
--
作者：
Wei, Liangliang;Li, Yang;Cui, Fuyi
污泥中的胞外聚合物（EPS）在废水处理过程中对重金属的去除起着重要作用。研究了活性污泥、厌氧颗粒污泥和厌氧絮凝污泥EPS对Zn2+和Cu2+的吸附特性、吸附机理以及EPS对Zn2+和Cu2+吸附的化学贡献。3种污泥样品中，Cu2+比Zn2+更易被吸附，厌氧颗粒污泥EPS的吸附能力高于厌氧絮凝污泥和活性污泥。活性污泥和厌氧絮凝污泥的疏水性EPS对Cu2+和Zn2+的吸附效果优于亲水性EPS。而厌氧颗粒污泥中亲水性EPS对重金属的去除作用更大。疏水性EPS和未分级EPS对重金属的吸附符合Langmuir吸附等温式，而亲水性EPS对重金属的吸附符合Freundlich吸附等温式。此外，通过红外光谱和荧光光谱分析，探讨了重金属吸附对污泥EPS光谱特性的影响。(C)2016爱思唯尔B.V.保留所有权利。
Extracellular polymeric substances (EPS) in sludge samples played a major role in heavy metals removal during wastewater treatment. In this study, the binding quality, adsorption mechanism, as well as the chemical fractional contribution of the sludge EPS from activated sludge, anaerobic granular sludge and anaerobic flocculent sludge to the adsorption of Zn2+ and Cu2+ was investigated. For all three sludge samples, Cu2+ could be more easily adsorbed than Zn2+, and EPS extracted from the anaerobic granular sludge exhibited a relatively higher adsorption capacity than that of anaerobic flocculent sludge and activated sludge. Specifically, hydrophobic EPS of the activated sludge and anaerobic flocculent sludge was more efficient in adsorbing Cu2+ and Zn2+ than that of the hydrophilic EPS. However, hydrophilic EPS in anaerobic granular sludge played a greater role in heavy metals removal. The adsorption of those two heavy metals onto the unfractionated and hydrophobic EPS could be better described by the Langmuir isotherm, while Freundlich models fitted hydrophilic EPS. In addition, the effect of the heavy metals adsorption on the spectrum characteristics of the sludge EPS was also explored by analysis of FT-IR and fluorescent spectra. (C) 2016 Elsevier B.V. All rights reserved.