Fabrication of asymmetric poly (m-phenylene isophthalamide) nanofiltration
membrane for chromium(VI) removal |
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Authors: | Xiaojing Ren Changwei Zhao Songshan Du Tao Wang Zhaokun Luan Jun Wang and Deyin Hou |
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Institution: | 1. State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China 2. State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China;College of Chemical Engineering,Xiangtan University,Xiangtan 411105,China |
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Abstract: | The feasibility of employing nanofiltration for the removal of chromium(VI) from wastewater was investigated. Poly (m-phenylene
isophthalamide) (PMIA) was used to fabricate asymmetric nanofiltration membrane through the phase-inversion technique. Scanning
electron microscopy (SEM) and atomic force microscopy (AFM) were used to characterize the obtained membrane, and the both
confirmed a much smoother surface which could reduce membrane fouling. The PMIA membrane showed di erent rejections to
electrolytes in a sequence of Na2SO4 > MgSO4 > NaCl > MgCl2, which was similar to the sequence of the negatively charged
nanofiltration membranes. Separation experiments on chromium(VI) solution were conducted at various operating conditions, such
as feed concentration, applied pressure and pH. It is concluded that chromium(VI) could be e ectively removed from chromiumcontaining
wastewater by the PMIA nanofiltration membranes while maintaining their pollution resistance under alkaline condition. |
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Keywords: | membrane separations poly (m-phenylene isophthalamide) nanofiltration chromium(VI) |
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