摘要
以多孔α-Al_2O_3为基材,表面旋涂天然高分子蛋白Zein膜作为结构导向剂,于160℃水热条件下合成致密的Silicalite-1担载膜,并研究考察了Zein膜涂覆次数对Silicalite-1担载膜厚度、气体渗透通量、渗透蒸发工艺中乙醇提浓性能等的影响。实验结果表明:预涂Zein膜导向Silicalite-1晶体在多孔α-Al_2O_3载体上均匀生成,实现了单次水热即可制备结构致密的Silicalite-1分离膜层;Zein膜在水热合成过程中缓慢溶解于碱性合成液中,导向Silicalite-1膜层均匀生长的同时并未改变Silicalite-1晶体结构。25℃下对3%(质量分数)乙醇/水溶液的渗透蒸发实验表明:涂覆8次Zein后导向合成的Silicalite-1分离膜总的渗透通量和乙醇分离因子分别为2.75kg·m^(-2)·h^(-1)和28.27,且随Zein涂覆次数的增加有增大的趋势。
Dense and uniform silicalite-1 membrane on porous α-Al2O3 substrate was prepared by spin coating of natural protein zein film as structure directing agent and in-situ hydrothermal synthesis at 160 ℃. The effects of zein coating times on the thickness of silicalite-1 membrane, gas permeation flux and ethanol concentration in pervaporation process were investigated. The predeposited zein film as directed template was conducive to the formation of uniform silicalite-1 membrane on Al2O3 substrate by single hydrothermal process. During the hydrothermal synthesis, zein film was slowly dissolved in alkaline synthetic solution, orienting the uniform growth of silicalite-1 membrane with unchanged crystal structure. The pervaporation experiments of 3% （mass fraction） ethanol solution at 25 ℃ showed that the total permeation flux and separation factor of the silicalite-1 membrane by pre-coating zein film 8 times were 2. 75 kg ·m^-2·h^-1 and 28. 27 respectively. The total permeation flux and separation factor increased with the increase of zein coating times.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2016年第18期75-79,共5页
Materials Reports
基金
国家自然科学基金(50972103)
2015年后勤工程学院科研基金(X2050125)
