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- Title
Preparation and characterization of bipolar membranes modified by cystine-modified TiO visible-light photocatalyst.
- Authors
Liu, Xian; Chen, Li-Jin; Chen, Ri-Yao; Chen, Zhen; Chen, Xiao; Zheng, Xi
- Abstract
A cystine-modified TiO visible-light photocatalyst was prepared by the sol-gel method and characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), and X-ray photoelectron spectroscopy (XPS). The XRD results showed the cystine-modified TiO was in the anatase phase, but with reduced size. UV-Vis DRS indicated that cystine-modification could reduce the band gap of TiO and enhance the absorption of visible light. The XPS spectra showed that the cystine-modified TiO sample contained C, N, and S, and that some of the C, N, and S entered the TiO lattice. The cystine-modified TiO visible-light photocatalyst was added to a chitosan (CS) anion-exchange layer to prepare PVA-CMC/modified TiO-PVA-CS bipolar membrane (BPM; here, PVA denotes poly(vinyl alcohol), CMC denotes carboxymethylcellulose, and the solidus '/' denotes the interlayer) by a paste method. The membrane was characterized by determination of contact angle, J- V characteristics, and AC impedance spectroscopy, among other techniques. Experimental results showed that the cystine-modified TiO visible-light photocatalyst was a better photocatalyst than TiO for splitting of water at the interlayer of the BPM. The membrane impedance and trans-membrane voltage drop ( IR drop) of the modified BPM clearly decreased under sunlight irradiation. At a current density of 60 mA/cm, the cell voltage of the PVA-CMC/modified TiO-PVA-CS BPM decreased by 0.9 V. Moreover, the hydrophilicity of the modified BPM was increased and its mechanical properties were improved.
- Subjects
TITANIUM oxides; PHOTOCATALYSTS; CYSTINE; VISIBLE spectra; SOL-gel processes; X-ray diffraction
- Publication
Research on Chemical Intermediates, 2015, Vol 41, Issue 6, p3623
- ISSN
0922-6168
- Publication type
Article
- DOI
10.1007/s11164-013-1476-6