Pervaporation characteristics and structure of poly(vinyl alcohol)/Poly(ethylene glycol)/Tetraethoxysilane hybrid membranes
Pervaporation characteristics and structure of poly(vinyl alcohol)/Poly(ethylene glycol)/Tetraethoxysilane hybrid membranes
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聚乙烯醇/聚乙二醇/四乙氧基硅烷杂化膜的渗透汽化特性及结构
DOI：
10.1002/app.26446
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发表时间：
2007-09-15
影响因子：
3
通讯作者：
Zhou, Guo Bo
中科院分区：
文献类型：
--
作者：
Ye, Li Yi;Liu, Qing Lin;Zhou, Guo Bo
聚乙烯醇（PVA）与聚乙二醇（PEG）共混，与四乙氧基硅烷（TEOS）交联，制备了有机-无机PVA/ PEG/TEOS杂化膜。然后将膜用于通过渗透蒸发（PV）脱水乙醇。利用傅里叶变换红外光谱（FTIR）、广角x射线衍射（WXRD）和扫描电镜（SEM）研究了杂化膜的理化结构。PVA和PEG与TEOS交联，交联密度随TEOS含量、退火温度和时间的增加而增加。杂化膜的水选择性随退火温度或时间的增加而增加；但同时，渗透通量减小。SEM图显示，当TEOS含量大于15 wt %时，杂化膜发生相分离。水透选择性随TEOS的加入而增加，在TEOS浓度为10 wt %时达到最大值。随着进料含水量和进料温度的升高，水的选择性降低，渗透通量增大。该杂化膜在130℃下退火12 h后，在15%水的乙醇溶液中表现出高的过电选择性，分离系数为300，渗透通量为0.046 kg m(-2) h（-1）。(c) 2007 Wiley期刊公司
Poly(vinyl alcohol) (PVA) blended with poly(ethylene glycol) (PEG) was crosslinked with tetraethoxysilane (TEOS) to prepare organic-inorganic PVA/ PEG/TEOS hybrid membranes. The membranes were then used for the dehydration of ethanol by pervaporation (PV). The physicochemical structure of the hybrid membranes was studied with Fourier transform infrared spectra (FTIR), wide-angle X-ray diffraction WXRD, and scanning electron microscopy (SEM). PVA and PEG were crosslinked with TEOS, and the crosslinking density increased with increases in the TEOS content, annealing temperature, and time. The water permselectivity of the hybrid membranes increased with increasing annealing temperature or time; however, the permeation fluxes decreased at the same time. SEM pictures showed that phase separation took place in the hybrid membranes when the TEOS content was greater than 15 wt %. The water permselectivity increased with the addition of TEOS and reached the maximum at 10 wt % TEOS. The water permselectivity decreased, whereas the permeation flux increased, with an increase in the feed water content or feed temperature. The hybrid membrane that was annealed at 130 degrees C for 12 h exhibited high permselectivity with a separation factor of 300 and a permeation flux of 0.046 kg m(-2) h(-1) in PV of 15 wt % water in ethanol. (c) 2007 Wiley Periodicals, Inc.