膜科学与技术

平板陶瓷载体上SiO2-ZrO2膜的制备及其纳滤性能研究

作者：任秀秀，夏凌云，钟璟

单位：常州大学，石油化工学院，江苏省绿色催化材料与技术重点实验室，常州 213164

关键词：陶瓷膜；纳滤；溶胶-凝胶法；双氯芬酸钠

出版年,卷(期):页码： 2021,41(6):110-117

摘要：

采用颗粒溶胶路线合成含有不同粒径的SiO2-ZrO2溶胶，将其涂覆于中空平板陶瓷微滤膜上制备SiO2-ZrO2纳滤膜并用于双氯芬酸钠的分离。在用粒径为42 nm 的SiO2-ZrO2溶胶对载体修饰的过程中，得出最佳溶胶质量分数和涂覆次数分别为0.5 %和4次。继而采用17 nm 的小粒径SiO2-ZrO2溶胶进一步涂覆，形成了更小孔径的膜，其截留分子量为310。在25 ℃和0.6 MPa的操作压力下对50 mg/L双氯芬酸钠水溶液进行纳滤测试，其通量为2.25 L/(m2·h)，截留率为95.1%。当料液温度为70℃时，膜的渗透通量达到8.25 L/(m2·h)，对双氯芬酸钠的截留率仍然保持在92.0%以上。

SiO2-ZrO2 sol with different sizes were prepared by colloidal sol route to prepare nanofiltration membranes on hollow flat ceramic for the separation of diclofenac sodium. The concentration and coating times of SiO2-ZrO2 sol with particle size of 42 nm were optimized as 0.5 wt% for 4 times on supports in the preparation. Then the pore size of membrane could be further reduced by SiO2-ZrO2 sol with particle size of 17 nm, resulting in a molecular cutoff weight of 310 Da as nanofiltration membrane. At 25 ℃ and 0.4 MPa, the membrane flux was 2.25 L/(m2·h) and the rejection was 92.5wt % in nanofiltrated 50 mg/L diclofenac sodium solutions. When the temperature was increased to 70 ℃, the flux reached to 8.25 L/(m2·h), and the rejection of diclofenac sodium remained above 92.0%.

任秀秀（1987-），女，山西省临汾市，讲师，博士，研究生学位，研究方向为膜分离，E-mail：renxiuxiu@cczu.edu.cn 。

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