KMS Chongqing Institute of Green and Intelligent Technology, CAS
Adsorption behavior of tightly bound extracellular polymeric substances on model organic surfaces under different pH and cations with surface plasmon resonance | |
Zhang, Peng1; Chen, You-Peng1,2; Guo, Jin-Song1,2; Shen, Yu2; Yang, Ji-Xiang2; Fang, Fang1; Li, Chun1; Gao, Xu1; Wang, Gui-Xue3 | |
2014-06-15 | |
摘要 | Tightly bound extracellular polymeric substances (TB-EPS) play a substantial role on microbial aggregates, which can promote microbial cells to aggregate and adhere onto the carrier in bioreactor. However, the attachment and adsorption of TB-EPS on different surfaces were awaited to be elucidated. In this study, four self-assembled monolayers (SAMs) carrying methyl (CH3-SAM), amino (NH2-SAM), hydroxyl (OH-SAM), and carboxyl (COOH-SAM) terminal groups were prepared to model different surfaces. TB-EPS adsorption on these surfaces under different pH conditions and additional cations were investigated using surface plasmon resonance. The adsorption of TB-EPS dramatically decreased with the decreasing pH values. CH3-SAM surface achieved the maximum adsorption at the same condition. Na+ promoted the TB-EPS adsorbed on COOH-SAM surface. The Ca2+-mediated complexes were attracted by COOH-SAM and repelled by NH2-SAM, respectively. The adsorptions of TB-EPS on the four SAM surfaces were significantly increased by adding Fe3+. These results demonstrated that the TB-EPS adsorption on the organic surfaces were dependent on the pH and cation of solution. (C) 2014 Elsevier Ltd. All rights reserved. |
关键词 | Adsorption Extracellular Polymeric Substances Self-assembled Monolayer Surface Plasmon Resonance |
DOI | 10.1016/j.watres.2014.03.018 |
发表期刊 | WATER RESEARCH |
ISSN | 0043-1354 |
卷号 | 57页码:31-39 |
收录类别 | SCI |
WOS记录号 | WOS:000337261400004 |
语种 | 英语 |