CdS quantum dots/Ti3+-TiO2 nanobelts heterojunctions as efficient visible-light-driven photocatalysts. (July 2018)

• Record Type: Journal Article
• Authors: Zhao, Tianyu; Xing, Zipeng; Xiu, Ziyuan; Li, Zhenzi; Shen, Liyan; Cao, Yan; Hu, Mengqiao; Yang, Shilin; Zhou, Wei
• Is Part Of: Materials research bulletin. Volume 103(2018)
• Page Start: 114
• Page End: 121
• Publication Date: 2018-07
• Subjects: CdS quantum dots -- TiO2 nanobelts -- Heterojunction -- Ti3+ self-doping -- Visible light photocatalysis; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.03.029
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: CdS quantum dots/Ti 3 + -TiO2 nanobelts heterojunctionsare fabricated via hydrothermal-chemical bath deposition method combined with solid-state chemical reduction strategy and exhibit excellent visible-light-driven photocatalytic performance, which is ascribed to synergistic effect of heterojunctions, Ti 3+ self-doping coupling with CdS quantum dots narrowing the bandgap and enhancing spatial separation of photogenerated charge carriers. Highlights: A novel CdS QDs/Ti 3+ -TiO2 nanobelts heterojunction photocatalyst is prepared. It narrows the bandgap and extends the photoresponse to visible light region. It exhibits excellent visible-light-driven photocatalytic performance. It is due to synergistic effect of CdS QDs, Ti 3+ self-doping and heterojunction. Abstract: CdS quantum dots (QDs)/Ti 3+ -TiO2 nanobelts heterojunctions as 0D/1D architectures are fabricated through hydrothermal-chemical bath deposition combine with in-situ solid-state chemical reduction approach. The CdS QDs of ∼7 nm are loaded on TiO2 nanobelts with width of 50–300 nm and several micrometers long, and the heterojunctions are formed efficiently. The prepared heterojunctions exhibit excellent photocatalytic performance for complete removal of methylene blue (∼99%) and hydrogen production efficiency (∼480.6 μmol h −1 ) under visible light irradiation, which are as high as 2 and 23 times than that of pristine TiO2 nanobelts. The enhancement is attributed to the Ti 3+ self-doping and CdS QDs extend the photoresponse to visible light region and the formation of heterojunctions favor the spatial separation of photogenerated charge carriers. Therefore, the high-efficient 0D/1D heterojunction composites have potential applications in the field of environment and energy.