Electrochemical Studies on De-Emulsification: Effect of a Biosurfactant Produced by Bacillus subtilis MO-1 |
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| Authors: | Guoqiang Li Haizhou Zhang |
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| Institution: | 1. Key Laboratory of Molecular Microbiology and Technology , Ministry of Education , Tianjin , P. R. China;2. College of Life Sciences , Nankai University , Tianjin , P. R. China;3. College of Life Sciences , Nankai University , Tianjin , P. R. China |
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| Abstract: | Model emulsions were de-emulsified using a biosurfactant produced by Bacillus subtilis MO-1 mixed with chemical de-emulsifiers. The speed and efficiency of de-emulsification by polyether type de-emulsifier (G-17) were enhanced by combined use of a biosurfactant produced by B. subtilis MO-1 (BS); this effect was more apparent at low concentrations. Polyether/biosurfactant synergy was confirmed by electrochemical measurement of the interfacial film electrical resistance (R m ) and capacitance (C m ) during de-emulsification. These values were closely related to the rate of water removal, demonstrating that electrical techniques are suitable for studying de-emulsification phenomena. |
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| Keywords: | Bacillus subtilis biosurfactant de-emulsification electrochemistry |
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