Solubilization properties of polycyclic aromatic hydrocarbons by saponin, a plant-derived biosurfactant |
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Authors: | Zhou Wenjun Yang Juanjuan Lou Linjie Zhu Lizhong |
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Affiliation: | a Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, China b Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310028, China |
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Abstract: | The enhanced solubilization of polycyclic aromatic hydrocarbons (PAHs) by saponin, a plant-derived non-ionic biosurfactant, was investigated. The results indicated that the solubilization capabilities of saponin for PAHs were greater than some representative synthetic non-ionic surfactants and showed strong dependence on solution pH and ionic strength. The molar solubilization ratio (MSR) of saponin for phenanthrene was about 3-6 times of those of the synthetic non-ionic surfactants, and decreased by about 70% with the increase of solution pH from 4.0 to 8.0, but increased by approximately 1 times with NaCl concentration increased from 0.01 to 1.0 M. Heavy metal ions can enhance saponin solubilization for phenanthrene and the corresponding MSR values increased by about 25% with the presence of 0.01 M of Cd2+ or Zn2+. Saponin is more effective in enhancing PAHs solubilization than synthetic non-ionic surfactants and has potential application in removing organic pollutants from contaminated soils. |
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Keywords: | Biosuractant Saponin Solubilization PAHs Influence factors |
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