论文部分内容阅读
将纯纳米TiO2和改性TiO2粒子分别添加到聚偏氟乙烯(PVDF)超滤膜铸膜液中,在超声辅助下进行凝胶成膜,制备出了不同结构与性能的PVDF复合超滤膜.采用红外光谱(FT-IR)、扫描电镜(SEM)、接触角测定、膜渗透测定等手段考察了超声波作用下不同改性复合膜结构与性能的变化(包括膜微观结构、表面接触角、膜通量、截留率).结果表明:超声凝胶作用提高了改性复合膜表面的粗糙度,使其亲水性得以强化;加速了凝胶过程溶剂与非溶剂之间的微相分离,使膜结构由海绵结构向指状多孔结构转变;在KH570-纳米TiO2与甲基丙烯酸甲酯(MMA)-丙烯酸(AA)-纳米TiO2改性复合超滤膜中,后者改性膜亲水性强化效果较为显著,且在截留率基本保持稳定的前提下,膜通量可达到85 mL/(cm2.h).
The pure nano-TiO2 and modified TiO2 particles were respectively added into the casting solution of polyvinylidene fluoride (PVDF) ultrafiltration membrane, and the membrane was gel-formed with the aid of ultrasound. Different structures and properties of PVDF composite ultrafiltration membrane The structure and properties of different modified composite membranes under ultrasonic wave (including the microstructure of the membrane, the contact angle of the surface, the contact angle of the membrane, Membrane flux and rejection rate). The results showed that the ultrasonic gel enhanced the roughness of the surface of the modified composite membrane to enhance its hydrophilicity, accelerated the micro-phase separation between the solvent and the non-solvent in the gel process, The film structure from the sponge structure to the finger-like porous structure; KH570- nano-TiO2 and methyl methacrylate (MMA) - acrylic acid (AA) - nano-TiO2 modified composite membrane, the latter modified membrane hydrophilic The effect of sexual enhancement is more remarkable, and the membrane flux can reach 85 mL / (cm2.h) under the premise of keeping the rejection rate basically stable.