膜科学与技术

介孔陶瓷膜表面接枝氨基硅烷的孔径调节研究

作者：张婷，李雪，熊峰，邱鸣慧，范益群

单位：南京工业大学化学化工学院, 材料化学工程国家重点实验室, 南京 210009

关键词：表面接枝；介孔陶瓷膜；亲水改性；孔径

出版年,卷(期):页码： 2016,36(1):45-49

摘要：

表面接枝技术是调控陶瓷膜表面性质的主要方法，而当表面接枝分子大小与膜孔径相当时，表面接枝过程也可用于改变膜的孔径. 本文采用表面接枝技术在介孔陶瓷膜表面接枝亲水性的氨基硅烷，考察了接枝过程对陶瓷膜渗透分离性能的影响，分析了接枝分子对陶瓷膜孔径的减小作用. 红外光谱及热重结果表明，3-氨丙基三甲氧基硅烷(APS)接枝到陶瓷膜表面；接触角实验结果表明，接枝APS分子后的陶瓷膜表面呈现亲水特性；控制改性溶液中APS浓度为10 mmol/L，可制备得到截留分子量为1000 Da的陶瓷膜，此时相比于未改性膜，孔径减小约1 nm.

Surface grafting is a key technique for chemical modification of ceramic membranes, noteworthily, when the grafting molecule size has a magnitude equal to the pore size of the membranes, the surface grafting process will inevitably affect the membrane pore size. In this paper, with the purpose of regulating the ceramic membrane pore size, the amino silane was grafted on the surface and pores of the mesoporous ceramic membranes via surface grafting, the effect of the grafting process on the properties of ceramic membranes was studied, and great attention was paid to the influence of the grafted APS molecules on the pore size of ceramic membranes. Fourier transform infrared spectroscopy(FTIR) and thermogravimertric analyses(TGA) confirmed the grafting of APS molecules onto the ceramic membrane surface. Water contact angle(CA) measurements indicated that the membranes were still hydrophilic after modification. Finally, the ceramic membrane with a MWCO of 1000 Da was obtained by controlling the concentration of APS in the modification solution 10 mmol/L, and the pore size decreased by 1 nm compared to the original membranes.

作者简介: 张婷(1989-), 女, 江苏徐州人, 硕士, 从事膜分离材料的研究与应用. *通讯联系人

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