Surface-modified zeolite-filled chitosan membranes for pervaporation dehydration of ethanol
2008; Elsevier BV; Volume: 254; Issue: 17 Linguagem: Inglês
10.1016/j.apsusc.2008.02.056
ISSN1873-5584
AutoresHonglei Sun, Lianyu Lu, Xue Chen, Zhongyi Jiang,
Tópico(s)Covalent Organic Framework Applications
ResumoSurface-modified zeolite-filled chitosan (CS) membranes were prepared by incorporating 3-mercaptopropyltrimethoxysilane (MPTMS)-modified H-ZSM-5 zeolite into chitosan for pervaporation dehydration of aqueous ethanol solution. The physicochemical characterization by XPS, FT-IR, XRD, DMA and SEM showed that –SO3H group was readily grafted on the surface of H-ZSM-5 with the mediation of MPTMS and hydrogen peroxide, and the accompanying ion–ion interaction between –SO3H group on surface-modified H-ZSM-5 and –NH3+ group on chitosan substantially eliminated the nonselective voids at the chitosan–H-ZSM-5 interface of the filled membranes. The experimental results also revealed that H-ZSM-5 exhibited desirable size-selective and preferential adsorption effects for aqueous ethanol solution. As a result, modified H-ZSM-5 filled membranes showed higher swelling degree and permeation flux, and improved selectivity for aqueous ethanol solution. In comparison between chitosan control membrane (permeation flux 54.18 g/(m2 h) and separation factor 158.02 for 90 wt.% aqueous ethanol solution at 80 °C), the modified H-ZSM-5 filled membrane with 8 wt.% filling content exhibited a remarkably improved pervaporation performance with permeation flux 278.54 g/(m2 h) and separation factor 274.46 under the identical experimental condition.
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