Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment
Department of Environmental Chemistry & Chemical Engineering, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano-machi, Hachioji, Tokyo 192-0015, Japan
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Membranes 2020, 10(11), 351; https://doi.org/10.3390/membranes10110351
Received: 1 September 2020
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Revised: 5 November 2020
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Accepted: 6 November 2020
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Published: 18 November 2020
(This article belongs to the Special Issue Membranes for Water and Wastewater Treatment)
Chitosan membranes were prepared by the casting method combined with alkali treatment. The molecular weight of chitosan and the alkali treatment influenced the water content and water permeability of the chitosan membranes. The water content increased as the NaOH concentration was increased from 1 to 5 mol/L. The water permeation flux of chitosan membranes with three different molecular weights increased linearly with the operating pressure and was highest for the membrane formed from chitosan with the lowest molecular weight. Membranes with a lower water content had a higher water flux. The membranes blocked 100% of compounds with molecular weights above methyl orange (MW = 327 Da). At 60 ≤ MW ≤ 600, the blocking rate strongly depended on the substance. The results confirmed that the membranes are suitable for compound separation, such as in purification and wastewater treatment.
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Keywords:
chitosan; membrane; water content; water permeability; alkali treatment
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MDPI and ACS Style
Nakayama, R.-i.; Katsumata, K.; Niwa, Y.; Namiki, N. Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment. Membranes 2020, 10, 351. https://doi.org/10.3390/membranes10110351
AMA Style
Nakayama R-i, Katsumata K, Niwa Y, Namiki N. Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment. Membranes. 2020; 10(11):351. https://doi.org/10.3390/membranes10110351
Chicago/Turabian StyleNakayama, Ryo-ichi, Koki Katsumata, Yuta Niwa, and Norikazu Namiki. 2020. "Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment" Membranes 10, no. 11: 351. https://doi.org/10.3390/membranes10110351
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