Effect of cations on the solubilization/deposition of triclosan in sediment-water-rhamnolipid system
| Autor: | Yuanbo Chen, Qian Guo, Jia Yan, Wenjin Wu, Yongyou Hu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Geologic Sediments
Environmental Engineering Health Toxicology and Mutagenesis 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences Micelle chemistry.chemical_compound Cations Zeta potential Environmental Chemistry Solubility Micelles 0105 earth and related environmental sciences 021110 strategic defence & security studies Aqueous solution Chromatography Chemistry Public Health Environmental and Occupational Health Rhamnolipid Water General Medicine General Chemistry Biodegradation Pollution Triclosan Solutions Biodegradation Environmental Critical micelle concentration Glycolipids Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Chemosphere. 159:465-472 |
| ISSN: | 0045-6535 |
| Popis: | Cations had great influence on the self-assembly of rhamnolipid, which in turn affected the fate of triclosan. The migration of triclosan from sediment to water benefited its biodegradation but it could be transformed into more toxic compounds. To regulate the fate of triclosan and reduce environmental risks extremely, the effect of four common cations in surface water (Na(+)/K(+)/Ca(2+)/Mg(2+)) on the solubilization/deposition of triclosan in sediment-water-rhamnolipid system was investigated. The interaction among cations, triclosan and rhamnolipid was explored based on self-assembly of rhamnolipid and water solubility of triclosan in rhamnolipid solutions. Results showed that cations had little influence on the fate of triclosan in the absence of rhamnolipid. Cations, especially Ca(2+)/Mg(2+), reduced the critical micelle concentration, micellar size and zeta potential of rhamnolipid solutions. The changes in self-assembly of rhamnolipid with different cations led to the difference of residual rhamnolipid concentration in water, which was nearly invariant with 0.01 M Na(+)/K(+) while decreased significantly with 0.01 M Ca(2+)/Mg(2+). Consequently, water solubility of triclosan in rhamnolipid solutions increased with the addition of Na(+)/K(+) whereas decreased with Ca(2+)/Mg(2+). In sediment-water- rhamnolipid system, triclosan was slightly solubilized from sediment to water with Na(+)/K(+) while deposited in sediment with Ca(2+)/Mg(2+). These findings provided an alternative application of rhamnolipid for the remediation of triclosan-polluted sediment. |
| Databáze: | OpenAIRE |
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