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One-dimensional porous Ag/AgBr/TiO2 nanofibres with enhanced visible light photocatalytic activity

Ming-Yue Ding, De-Shui Meng, Yan-Hong Tang, Cheng-Bin Liu, and Sheng-Lian Luo

State Key Laboratory of Chemo/Biosensing and Chemometrics

 

E-mail: tangyh@hnu.edu.cn

Abstract: One-dimensional (1D) Ag/AgBr/TiO2 nanofibres (NFs) have been successfully fabricated by the one-pot electrospinning method. In comparison with bare TiO2 NFs and Ag/AgBr/PVP (polyvinylpyrrolidone) NFs, the 1D Ag/AgBr/TiO2 NFs photocatalyst exhibits much higher photocatalytic activity in the degradation of a commonly used dye, methylene blue (MB), under visible light. The photocatalytic removal efficiency of MB over Ag/AgBr/TiO2 NFs achieves almost 100 % in 20 min. The photocatalytic reaction follows the first-order kinetics and the rate constant (k) for the degradation of MB by Ag/AgBr/TiO2 NFs is 5.2 times and 6.6 times that of Ag/AgBr/PVP NFs and TiO2 NFs, respectively. The enhanced photocatalytic activity is ascribed to the stronger visible light absorption, more effective separation of photogenerated electron-hole pairs, and faster charge transfer in the long nanofibrous structure. The Ag/AgBr/TiO2 NFs maintain a highly stable photocatalytic activity due to its good structural stability and the self-stability system of Ag/AgBr. The mechanisms for photocatalysis associated with Ag/AgBr/TiO2 NFs are proposed. The degradation of MB in the presence of scavengers reveals that h+ and O 2 significantly contribute to the degradation of MB.

Keywords: electrospinning – Ag/AgBr – TiO2 nanofibre – photocatalysis

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0151

 

Chemical Papers 69 (11) 1411–1420 (2015)

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