Comparative study of the role of extracellular polymeric substances in biosorption of Ni(II) onto aerobic/anaerobic granular sludge

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• 作者：Na Li^a ; Dong Wei^a ; Shaotong Wang^a ; Lihua Hu^b ; Weiying Xu^a ; Bin Du^a ; ^{dubin61@gmail.com} ; Qin Wei^b
• 关键词：Extracellular polymeric substances (EPS) ; Ni(II) biosorption ; Granular sludge ; Three-dimensional excitation-emission matrix (3D-EEM)
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：490
• 期：Complete
• 页码：754-761
• 全文大小：1961 K
• 卷排序：490

文摘

This study was carried out to comparatively evaluate the role of extracellular polymeric substances (EPS) in biosorption of Ni(II) onto aerobic/anaerobic granular sludge (AGS and AnGS). Batch sorption experiments data suggested that Ni(II) sorption onto AGS and AnGS were better fitted to Langmuir and Freundlich model, respectively. The contribution of EPS in the sorption of AnGS was higher than that of AGS. Interaction between EPS and Ni(II) was investigated by a combined three-dimensional excitation-emission matrix (3D-EEM), synchronous fluorescence spectra, two-dimensional correlation spectroscopy (2D-COS) and fourier transform infrared spectroscopy (FTIR). 3D-EEM showed that protein (PN)-like substances were the main peaks in EPS from AGS and AnGS. The quenched types of AGS and AnGS in the presence of Ni(II) belonged to dynamic and static quenching, respectively. Additionally, 2D-COS demonstrated that fluorescence change took place sequentially followed to humic-like region > PN-like region in AGS and fulvic-like fraction > PN-like and humic-like fractions in AnGS. According to FTIR spectra, hydroxyl group and amino group in both EPS were the key functional groups for Ni(II) sorption.