title: Effects of monorhamnolipid and dirhamnolipid on sorption and desorption of triclosan in sediment-water system.
abstract: The effects of monorhamnolipid (RL-F1) and dirhamnolipid (RL-F2) on the sorption and desorption of triclosan (TCS) in sediment-water system were investigated in this study. Results of the bath equilibrium experiments showed that RL-F2 provided much higher solubilization enhancement for TCS than RL-F1. Sorption of both rhamnolipids by the sediments was highly correlated with the sediment clay content. Moreover, the apparent distribution coefficients of TCS K(d)(*) decreased with the increase of rhamnolipid concentration (0.05-7.5 mM), and RL-F2 presented a larger distribution capacity of TCS into the aqueous phase at relatively higher concentrations (>2.5 mM). Further results also indicated that the release of TCS from sediment could be enhanced by both rhamnolipids. RL-F2 was more efficient than RL-F1 in desorbing TCS from the sediment with low clay content. The TCS desorption percentages R(d)(*) of RL-F2 (5mM) was 1.8-2.4 times that of RL-F1. These findings could provide useful guidelines for the application of rhamnolipid-enhanced remediation technologies for TCS contaminated sediment.
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China. sherry0102@live.cn
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Zhang
authors.forename: Qian
authors.initials: Q
authors.lastname: Guo
authors.forename: Yongyou
authors.initials: Y
authors.lastname: Hu
authors.forename: Hui
authors.initials: H
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D000077215:Clay; D052918:Environmental Restoration and Remediation / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D006017:Glycolipids / Q000737:chemistry*; D014260:Triclosan / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D000538:Aluminum Silicates; D006017:Glycolipids; D014874:Water Pollutants, Chemical; D014260:Triclosan; D000077215:Clay