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Study on the anti-fouling properties of PVDF/SiO2 ultrafiltration membranes: micro-force analysis
Authors： WANG Xin1, WANG Lei1, HUANG Danxi1, MENG Xiaorong1, WANG Lei1, CHEN Licheng2, WANG Xudong1
Units： 1School of Environmental and Municipal Engineering, Xi’an university of Architecture and Technology, Xi’an 710055; 2College of Environment and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China.
KeyWords： PVDF ultrafiltration membrane; nano-SiO2; atomic force microscopy (AFM); hydrophilicity; membrane fouling
ClassificationCode：PVDF超滤膜；纳米SiO2；AFM；亲水性；膜污染
year,volume(issue):pagination： 2014, 34(5):73-78

Abstract：

Organic-inorganic plate ultrafiltration membranes were prepared via phase inversion method through blending SiO2 nanoparticles with PVDF. The effects of SiO2 concentration from 1% to 3% on the contact angle, average pore size and permeability of membranes were investigated. The anti-fouling behavior of PVDF/SiO2 membranes was evaluated by macro filtration experiment with BSA as standard foulant. In addition, the micro-forces of membrane-BSA foulant in the fouling process were investigated by atomic force microscope (AFM) in conjunction with self-made foulant-coated colloidal probe. Results revealed that the flux, average pore size and hydrophilicity of the membranes were improved effectively by the additive of SiO2. The performance was optimum when the adding amount of SiO2 was 1%. The above-mentioned conclusions were confirmed by the SEM images of surface and cross-section microstructure. The results of membrane fouling evaluation showed that, for P1 membrane, the flux decline rate was decreased slowly, and the flux recovery rate was improved. Meanwhile, anti-fouling performance was better. The AFM data indicated that the adhesive forces of membranes-BSA foulant were decreased with the hydrophilicity of modified membranes increased, and became smaller as BSA foulant accumulated gradually in the surface of membranes. It illustrated preliminarily that interactions of membranes and BSA foulant was the main reason of membrane fouling. That is, membrane fouling in the initial filtration stage was reduced by the additive of SiO2, which lead to improve the anti-fouling properties of PVDF ultrafiltration membranes.

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