膜科学与技术

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Construction of nano TiO2 modified layer on membrane surface and its resistance to protein pollution

Authors： ZHENG Ximing, FAN Rongyu

Units： Key Laboratory of Green Chemical Technology of Fujian Province University, School of Ecology and Resource Engineering

KeyWords： microporous polypropylene membrane; surface modification; protein pollution; hydrophilicity; nano titanium dioxide

ClassificationCode：O63; TQ028.8

year,volume(issue):pagination： 2018,38(4):8-13

Abstract：

Using nano TiO2 colloid and dopamine as modifiers, nano TiO2 particles were uniformly deposited on the surface of microporous polypropylene membrane (MPPM) by oxidation and self polymerization of dopamine. The membranes were characterized with Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results confirmed that the porous morphology of the membranes did not change after modification, and only a large number of nano TiO2 particles were evenly loaded on the membrane surfaces. The test results of static water contact angle and pure water flux show that the modified membranes had excellent hydrophilicity. Under 0.10 MPa, the pure water flux of MPPM was 0, while the pure water flux of the membrane modified by nano TiO2 could be stabilized at 4625 L/(m2·h). The results of protein static adsorption and protein solution filtration show that the modified membrane had good anti protein pollution performance, and the flux decline rate of protein solution was as low as 35%. Moreover, the protein on the membrane surfaces could be removed by water, and the flux recovery rate was as high as 83%.

Funds：

福建省自然科学基金(2015J01602, 2014J01056)

AuthorIntro：

第一作者简介：郑细鸣(1970–)，男，南靖县人，教授，博士，研究方面：膜表面工程及水处理技术，E-mail: zhengxm70@163.com

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