Pervaporation performance and characterization of organosilica membranes with a tuned pore size by solid-phase HCl post-treatment

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• 作者：Jinhui Wang^a ; Genghao Gong^a ; Masakoto Kanezashi^a ; Tomohisa Yoshioka^a ; Kenji Ito^b ; Toshinori Tsuru^a ; ^{tsuru@hiroshima-u.ac.jp}
• 关键词：Solid-phase HCl post-treatment ; Pervaporation ; Organic-inorganic ; Hybrid silica membrane ; Positron annihilation lifetime
• 刊名：Journal of Membrane Science
• 出版年：2013
• 出版时间：15 August, 2013
• 年：2013
• 卷：441
• 期：Complete
• 页码：120-128
• 全文大小：816 K

文摘

Organic-inorganic hybrid silica membranes were prepared from 1, 2 bis (triethoxysilyl)ethane (BTESE) by sol-gel processing at temperatures as low as 100 ¡ãC, followed by solid-phase HCl-assisted post-treatment to tune the silica network by reducing the pore size. The Brunauer-Emmett-Teller (BET) surface area, thermogravimetric (TG) and positron annihilation lifetime (PAL) showed reduced pore sizes and a densified network structure of BTESE powder after the HCl-assisted treatment. The HCl-assisted treatment increased the permeance ratios of both He-to-N₂ and He-to-C₃H₈, while the permeance of He was decreased. During the pervaporation (PV) dehydration of a 90 wt % (wt % ) isopropanol (IPA) aqueous solution at 75 ¡ãC, a BTESE membrane fired at 100 ¡ãC with HCl treatment showed a stable PV water flux of 2.46 kg m^?2 h^?1 and a separation factor of 3960 for more than 80 h, confirming the successful preparation of BTESE membranes at low firing temperatures. The BTESE-derived silica networks were successfully and easily controlled by this novel HCl-assisted post-treatment.