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Binding of dicamba to soluble and bound extracellular polymeric substances (EPS) from aerobic activated sludge: A fluorescence quenching study
Xiangliang Pan; Jing Liu; Daoyong Zhang; Xi Chen; Wenjuan Song; Fengchang Wu
2010
Source PublicationJournal of Colloid & Interface Science
Volume345Issue:2Pages:442-447
AbstractBinding of dicamba to soluble EPS (SEPS) and bound EPS (BEPS) from aerobic activated sludge was investigated using fluorescence spectroscopy. Two protein-like fluorescence peaks (peak A with Ex/Em02=0222502nm/342–34402nm and peak B with Ex/Em02=02275/340–34402nm) were identified in SEPS and BEPS. Humic-like fluorescence peak C (Ex/Em02=02270–27502nm/450–46002nm) was only found in BEPS. Fluorescence of the peaks A and B for SEPS and peak A for BEPS were markedly quenched by dicamba at all temperatures whereas fluorescence of peaks B and C for BEPS was quenched only at 29802K. A dynamic process dominated the fluorescence quenching of peak A of both SEPS and BEPS. Fluorescence quenching of peak B and C was governed a static process. The effective quenching constants (log02 K a ) were 4.725–5.293 for protein-like fluorophores of SEPS and 4.23–5.190 for protein-like fluorophores of BEPS, respectively. Log02 K a for humic-like substances was 3.85. Generally, SEPS had greater binding capacity for dicamba than BEPS, and protein-like substances bound dicamba more strongly than humic-like substances. Binding of dicamba to SEPS and BEPS was spontaneous and exothermic. Electrostatic force and hydrophobic interaction forces play a crucial role in binding of dicamba to EPS.
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6827
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Xiangliang Pan,Jing Liu,Daoyong Zhang,et al. Binding of dicamba to soluble and bound extracellular polymeric substances (EPS) from aerobic activated sludge: A fluorescence quenching study[J]. Journal of Colloid & Interface Science,2010,345(2):442-447.
APA Xiangliang Pan,Jing Liu,Daoyong Zhang,Xi Chen,Wenjuan Song,&Fengchang Wu.(2010).Binding of dicamba to soluble and bound extracellular polymeric substances (EPS) from aerobic activated sludge: A fluorescence quenching study.Journal of Colloid & Interface Science,345(2),442-447.
MLA Xiangliang Pan,et al."Binding of dicamba to soluble and bound extracellular polymeric substances (EPS) from aerobic activated sludge: A fluorescence quenching study".Journal of Colloid & Interface Science 345.2(2010):442-447.
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