title: Contributions of functional groups and extracellular polymeric substances on the biosorption of dyes by aerobic granules.
abstract: The contributions of loosely bound extracellular polymeric substances (LB-EPS), tightly bound EPS (TB-EPS), residual sludge (the sludge left after EPS extraction) and functional groups such as amine, carboxyl, phosphate and lipid on aerobic granules on biosorption of four different dyes (Reactive Brilliant Blue KN-R (KN-R), Congo Red (CR), Reactive Brilliant Red K-2G (RBR) and Malachite Green (MG)) were investigated. EPS may be responsible for biosorption of cationic dyes. However, residual sludge always made greater contribution than that of EPS. The biosorption mechanisms were dependent on the functional groups on aerobic granules and dyes' chemical structures. The lipid and phosphate groups might be the main binding sites for KN-R biosorption. Amine, carboxyl, phosphate and lipid were all responsible for the binding of CR. The lipid fractions played an important role for RBR biosorption. For MG, the phosphate groups gave the largest contribution.
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China. gao.jingfeng@bjut.edu.cn
authors.forename: Jing-Feng
authors.initials: JF
authors.lastname: Gao
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jin-Hui
authors.initials: JH
authors.lastname: Wang
authors.forename: Xue-Lei
authors.initials: XL
authors.lastname: Wu
authors.forename: Shu-Ying
authors.initials: SY
authors.lastname: Wang
authors.forename: Yong-Zhen
authors.initials: YZ
authors.lastname: Peng
mesh_terms: D000327:Adsorption; D000332:Aerobiosis; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001704:Biopolymers / Q000302:isolation & purification / Q000378:metabolism*; D004396:Coloring Agents / Q000302:isolation & purification*; D003224:Congo Red; D005110:Extracellular Space / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012394:Rosaniline Dyes; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001704:Biopolymers; D004396:Coloring Agents; D012394:Rosaniline Dyes; D012722:Sewage; C005095:malachite green; D003224:Congo Red