Membrane Science and Technology

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Preparation and Hydrogen Separation of Hydrophobic Silica Membranes modified by Perfluorodecyl Group

Authors： DING Yuanli, WEI Qi, LIU Xiangge, LI Qunyan, NIE Zuoren

Units： College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

KeyWords： perfluorodecyl groups; Sol-gel technique; hydrophobic silica membrane; hydrogen separation

ClassificationCode：O613.72

year,volume(issue):pagination： 2014, 34(6):22-27

Abstract：

A sol-gel technique was used to synthesize perfluorodecyl-modified silica membranes with tetraethyl orthosilicate (TEOS) and 1H,1H,2H,2H-Perflouorodecyltriethoxysilane (PFDTES) as precursors under acidic and clean room conditions. The particle size distribution of silica sols and the hydrophobic properties of modified silica membranes were characterized by means of dynamic light scattering(DLS), water contact angle measurement, Fourier translation infrared spectroscopy (FT-IR) and thermo gravimetric analysis (TG). The hydrogen permeation and separation performance of modified silica membranes were also investigated in detail. The results show that when the molar ratio of PFDTES/TEOS reaches 0.2, the modified silica sols have a particle size centered at 3.90nm, which is extremely suitable for dip-coating. Perfluorodecyl groups have been successfully incorporated and hydrophobic silica membranes with a water contact angle of 112.0°±0.6° are obtained at above-mentioned molar ratio. The hydrogen transport in modified silica membranes complies predominantly with activated diffusion mechanism, as demonstrated by the fact that the hydrogen permeance increases with increasing temperatures. At a temperature of 300°C, the modified membranes exhibit a significantly high H2 permeance of 10.00×10-7 mol·m-2·s-1·Pa-1, a H2/CO2 permselectivity of 6.10 and a H2/CO2 binary gas mixture separation factor of 13.30, higher than that of Knudsen diffusion(4.69).

Funds：

国家自然科学基金项目（批准号：21171014,50502002）、国家863计划课题（批准号：2009AA03Z213）、北京市教委科技计划重点项目资助（批准号：KZ201410005006）.

AuthorIntro：

丁元利（1989-），男，硕士研究生，山东临沂人，主要从事用于气体分离的二氧化硅膜材料的制备与表征.

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