Preparation and characterisation of polyaniline based membranes for gas separation |
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| Institution: | 1. Department of Chemical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK;2. Fachhochschule Ostfriesland, Constantiaplatz 4 26721 Emden, Germany;1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China;2. School of Pharmaceutical and Chemical Engineering, Taizhou University, Shifu Avenue 1139, Jiaojiang 318000, China;1. Department of Chemical Engineering, COMSATS Institute of Information Technology, Lahore, Pakistan;2. Center of Surface Chemistry and Catalysis, Faculty of Bioscience Engineering, KU Leuven, Belgium;1. Key laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Transport rates (permeability) and ideal separation factors for several gas pairs through dense polyaniline membranes are reported. The ideal separation factors for all gas pairs tested were found to be independent of the polyaniline membrane thickness whereas the permeability of the single gases showed significant variations. Both dedoped and redoped films (film thickness between 9 and 67 μm) were studied. The highest selectivities α(A/B) found were 7.6 for the gas pair H2/CO2 in the case of the dedoped membrane and 10 for the gas pair H2/CO2, 6 for O2/N2 and 200 for H2/N2 in the case of the redoped membrane. Statistical analysis of a large number of membranes allowed the critical comparison with results obtained by other groups.Comparison with other membrane materials shows that an approximately sixfold enhancement of the respective separation factors is possible for gas pairs containing hydrogen. Similar separation factors are observed for the gas pairs CO2/O2, CO2/N2 and N2/O2.Membranes for which Knudsen diffusion was observed exhibited regularly distributed micropores (400 nm diameter). |
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