膜科学与技术

超声辅助的溶胶-凝胶法制备ZrO2纳滤膜

作者：严强，陈奕山，邱鸣慧，陈献富，范益群

单位：南京工业大学化工学院材料化学工程国家重点实验室, 南京210009

关键词：超声；溶胶-凝胶法；ZrO2；陶瓷膜；纳滤

出版年,卷(期):页码： 2018,38(6):90-96

摘要：

提出采用超声辅助的溶胶-凝胶法制备ZrO2纳滤膜．采用水作为溶剂，通过在溶胶的制备过程中引入超声场，避免了沉淀的产生．在前驱体水解阶段实现了对溶胶粒径的控制，获得了平均粒径为1~2 nm的ZrO2颗粒溶胶．超声场的引入不仅可以促进ZrO2颗粒溶胶的形成，还有利于提高ZrO2材料的热稳定性．经400 °C煅烧后，获得四方相ZrO2纳滤膜，膜层光滑完整无缺陷，膜厚较薄，约为250 nm．纳滤膜表现出较高的分离性能和渗透性能，对PEG的截留分子量为600 Da左右，对应的Stokes直径约为1.2 nm，纯水渗透率为200~250 L·m-2·h-1·MPa-1．初步考察了ZrO2纳滤膜在低聚果糖纯化中的应用，用于脱除低聚果糖中的单糖和二糖组分．

Ultrasound-assisted sol-gel method was proposed for the fabrication of ZrO2 nanofiltration membranes by using water as the solvent. Due to the introduction of ultrasound in the preparation of the colloidal sol, the phenomena of precipitation was avoided. Since the colloidal size was controlled in the hydrolysis stage of the precursor, the ZrO2 colloidal sol with an average particle size of 1~2 nm was obtained. The introduction of ultrasound can not only promote the formation of ZrO2 sol with nanosized colloids, but also help to improve the thermal stability of obtained ZrO2 materials. After been calcinated at 400 °C for 2 h, ZrO2 nanofiltration membrane with a pure tetragonal phase was obtained. The surface of obtained nanofiltration membrane was smooth and defects-free. The thickness of membrane layer was as thin as about 250 nm. The nanofiltration membranes exhibited high separation accuracy and permeation flux. The molecular weight cut off for PEG was 600 Da corresponding to a Stokes diameter of 1.2 nm. The pure water permeability was 200~250 L·m-2·h-1·MPa-1. The application of ZrO2 nanofiltration membrane in the purification of fructo-oligosaccharide was preliminary investigated to remove monosaccharide and disaccharide components from the solution.

作者简介：严强(1993-)，男，江苏江阴人，硕士，研究方向为膜分离．*通讯联系人

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