膜科学与技术

高渗透性ZrO2中空纤维陶瓷超滤膜的制备研究

作者：詹涛，张小珍，周俊，王少华，胡学兵，常启兵

单位：景德镇陶瓷大学材料科学与工程学院，江西省高校无机膜重点实验室，景德镇 333403

关键词：中空纤维陶瓷膜；支撑体；溶胶浸渍涂覆技术；超滤膜；氧化钇稳定氧化锆

出版年,卷(期):页码： 2022,42(1):41-49

摘要：

采用相转化法制备的高渗透性中空纤维陶瓷微滤膜为支撑体，通过溶胶浸渍涂覆技术制备了小孔径ZrO2陶瓷超滤膜。研究了支撑体预处理、溶胶组成、热处理温度、涂覆次数等因素对制备的ZrO2超滤膜的微结构及性能的影响。结果表明，适量钇的引入可使ZrO2形成稳定的立方萤石结构晶相，可避免膜层出现开裂。在优化的热处理温度、溶胶组成条件下，通过二次涂覆可在中空纤维膜支撑体表面制备出连续光滑、无缺陷的ZrO2膜层，膜厚度和平均孔径分别为450 nm和12 nm，相应的陶瓷膜的纯水通量和抗弯强度分别可达到2020 L·m-2·h-1·MPa-1和97.1 MPa。

ZrO2 ceramic ultrafiltration membranes with small pore size were prepared directly by the sol dip-coating technique, using highly permeable hollow fiber ceramic microfiltration membranes by phase inversion method as the support. The effects of the pretreatment of the support, sol composition, heat-treatment temperature, and coating times on the microstructure and properties of the prepared ZrO2 ultrafiltration membranes were investigated. The results showed that the introduction of an appropriate amount of yttrium could lead to the formation of ZrO2 crystalline phase with a stable cubic fluorite structure, which could avoid the cracking of the active membrane layer. Under the optimized conditions of heat treatment temperature and sol composition, a continuous and smooth ZrO2 membrane layer without any defects can be obtained on the hollow fiber support after twice coating. The formed ZrO2 layer shows a thickness of about 450 nm and mean pore size of 12 nm, and the corresponding pure water flux and flexural strength of the ceramic membrane could reach 2020 L·m-2·h-1·MPa-1 and 97.1 MPa, respectively.

詹涛(1995-), 男, 安徽合肥人, 硕士生, 主要从事中空纤维陶瓷膜的制备和应用研究

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