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Preparation and characterization of bipolar membranes modified using photocatalyst nano-TiO2 and nano-ZnO

Authors

  • Riyao Chen,

    Corresponding author
    1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, People's Republic of China
    • College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, People's Republic of China
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  • Yanyu Hu,

    1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, People's Republic of China
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  • Zhen Chen,

    1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, People's Republic of China
    2. Chemistry Department of Fujian Ningde Teachers College, Ningde 352100, People's Republic of China
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  • Xiao Chen,

    1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, People's Republic of China
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  • Xi Zheng

    1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, People's Republic of China
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Abstract

The nano-ZnO and nano-TiO2 were added into chitosan (CS) anion layer to prepare polyvinyl alcohol (PVA) - sodium alginate (SA)/ TiO2-ZnO-CS (here, PVA:polyvinyl alcohol; SA:sodium alginate) bipolar membrane (BPM), which was characterized using scanning electron microscopy, atomic force microscopy (AFM), thermogravimetric analysis (TG), electric universal testing machine, contact angle measurer, and so on. Experimental results showed that nano-TiO2-ZnO exhibited better photocatalytic property for water splitting at the interlayer of BPM than nano-TiO2 or nano-ZnO. The membrane impedance and voltage drop (IR drop) of the BPM were obviously decreased under the irradiation of high-pressure mercury lamps. At a current density of 60 mA/cm2, the cell voltage of PVA-SA/TiO2-ZnO-CS BPM-equipped cell decreased by 1.0 V. And the cell voltages of PVA-SA/TiO2-CS BPM-equipped cell and PVA-SA/ZnO-CS BPM-equipped cell were only reduced by 0.7 and 0.6 V, respectively. Furthermore, the hydrophilicity, thermal stability, and mechanical properties of the modified BPM were increased. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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