Contributions of functional groups and extracellular polymeric substances on the biosorption of dyes by aerobic granules.
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.
Gao
Jing-Feng
JF
College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China. gao.jingfeng@bjut.edu.cn
Zhang
Qian
Q
Wang
Jin-Hui
JH
Wu
Xue-Lei
XL
Wang
Shu-Ying
SY
Peng
Yong-Zhen
YZ
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
D001704:Biopolymers; D004396:Coloring Agents; D012394:Rosaniline Dyes; D012722:Sewage; C005095:malachite green; D003224:Congo Red