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采用模板剂法合成了具有三维孔道结构的MCM-48二氧化硅纳米球形颗粒。将MCM-48分散到含三醋酸纤维素(CTA)的铸膜液中,通过相转化法制备了MCM-48CTA正渗透复合膜。复合膜的表征数据表明,MCM-48成功的掺杂到CTA膜中,而且随着MCM-48含量的增加,膜的亲水性增强,孔隙率增大。正渗透实验结果表明,以纯水为原料液,1 mol/L NaCl为汲取液时,与纯CTA膜相比,MCM-48CTA膜水通量增加一倍,达到了14.2 L/(m~2·h),反向盐通量为0.15 mol/(m~2·h)。表明,MCM-48纳米颗粒可以有效的优化CTA正渗透膜的分离性能。
MCM-48 silica nanoparticles with three-dimensional pore structure were synthesized by the template method. MCM-48 was dispersed into casting solution containing cellulose triacetate (CTA), MCM-48 CTA positive infiltration composite membrane was prepared by phase inversion method. Characterization of the composite membrane data showed that MCM-48 was successfully doped into the CTA membrane, and with the increase of MCM-48 content, the hydrophilicity of the membrane increased and the porosity increased. The results of positive infiltration experiments showed that the water flux of MCM-48 CTA membrane doubled to 14.2 L / (1 mol / L) compared with pure CTA membrane when using pure water as raw material and 1 mol / L NaCl as draw solution m ~ 2 · h) and the reverse salt flux is 0.15 mol / (m ~ 2 · h). It shows that MCM-48 nanoparticles can effectively optimize the separation performance of CTA positive osmosis membrane.