TitleCore-shell g-C3N4/Pt/TiO2 nanowires for simultaneous photocatalytic H-2 evolution and RhB degradation under visible light irradiation
AuthorsDou, Hailong
Qin, Yumei
Pan, Feng
Long, Dan
Rao, Xi
Xu, Guo Qin
Zhang, Yongping
AffiliationSouthwest Univ, Sch Mat & Energy, 2 Tiansheng Rd, Chongqing 400715, Peoples R China
Peking Univ, Coll Chem & Mol Engn, 202 Chengfu Rd, Beijing 100871, Peoples R China
Natl Univ Singapore, Dept Chem, 3 Sci Dr 3, Singapore 117543, Singapore
Issue Date2019
AbstractCore-shell g-C3N4/Pt/TiO2 nanowire structures were successfully synthesized through a facile two-step synthetic methodology, involving photodepositing Pt nanoparticles on the surface of TiO2 nanowires and subsequent growth of g-C3N4 (CN) layers via thermal evaporation of urea. The as-prepared CN/Pt/TiO2 composites show a higher photocurrent density compared to CN/TiO2. The CN/Pt/TiO2 photocatalysts exhibit an enhanced H-2 evolution rate of 8.93 mu mol h(-1) under visible light irradiation, which is 1.25 times higher than that of CN/TiO2 (7.15 mu mol h(-1)), while Pt/TiO2 and TiO2 nanowires do not show any visible light responses. Our experiments demonstrate for the first time that CN/Pt/TiO2 with a unique core-shell nanowire structure of semiconductor-metal-semiconductor enables concurrent hydrogen evolution through photo-induced water splitting and RhB degradation by photo-oxidation in the visible range. This result is probably attributable to the formation of a heterojunction and the Pt nanoclusters in CN/Pt/TiO2, facilitating the electron transfer from the LUMO of g-C3N4 to that of TiO2 and generating different active sites upon photo-absorption in the CN layers. Our work provides a feasible way to obtain H-2 while treating sewage using photocatalysis.
Appears in Collections:化学与分子工程学院

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