采用相转化和高温烧结相结合的方法制备四通道α-Al2O3中空纤维,系统考察了SiO2掺杂含量对中空纤维结构与性能的影响.结果表明,1 500℃煅烧温度下SiO2与Al2O3发生原位烧结反应生成莫来石相,且莫来石相的含量随SiO2掺杂含量的增加而增大;SiO2掺杂含量的增加有利于提高中空纤维的纯水通量和孔隙率,当SiO2掺杂含量达到20％(摩尔分数)时,中空纤维的纯水通量可达18.11 m3/(m2·h),孔隙率为59.9％.选用SiO2掺杂含量为20％的中空纤维作为载体,合成的中空纤维NaA分子筛膜用于90％(质量分数)乙醇/水渗透汽化分离,75℃下膜的渗透通量高达21.21 kg/(m2·h).
Four-channel α-Al2O3 hollow fibers were fabricated by phase inversion and sintering method.Effects of SiO2 doping content on structure and property of hollow fiber were investigated.The results showed that mullite-phase was formed due to the in-situ reaction between SiO2 and Al2O3 at 1 500 ℃ and its content enlarged with the SiO2 doping content.High pure water flux and porosity of hollow fiber were achieved under high SiO2 doping content.When the SiO2 doping content was 20％ (mole fraction),the pure water flux and porosity of as-prepared hollow fiber were 18.11 m3/(m2 · h) and 59.9％,respectively.Further,the hollow fiber owning a porosity of 59.9％ was used as support to prepare hollow fiber NaA zeolite membrane for pervaporation of 90％ (mass fraction) ethanol/water mixture.The permeation flux of the membrane was 21.21 kg/(m2 · h) at 75 ℃.
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