Bi-nanoparticle-decorated BiPO 4 nanorods with improved photocatalytic activity
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Bi-nanoparticle-decorated BiPO4 nanorods with improved photocatalytic activity Qifeng Jing1,2, Lin Huang1, Qingsen Li1, Yingying Song1, and Limiao Chen1,*
1
Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China 2 School of Materials Science and Engineering, Central South University, Changsha 410083, People’s Republic of China
Received: 15 July 2020
ABSTRACT
Accepted: 4 October 2020
Bi-nanoparticle-decorated BiPO4 (Bi/BiPO4) hybrid nanorods were successfully fabricated through a redox process using BiPO4 nanorods and N2H4H2O as selfsacrificing template and reducing agent, respectively. It was revealed that the reduction extent of BiPO4 can be easily controlled via manipulating the N2H4H2O concentration in the reaction solution. Loading Bi nanoparticles on BiPO4 nanorods can remarkably broaden the light absorption range and boost the photogenerated charge carrier separation. As a result, Bi/BiPO4 nanorods exhibited a superior photocatalytic activity for degradation of rhodamine B (RhB) molecules under simulated sunlight illumination, as compared with the bare BiPO4. The superior photocatalytic performance of Bi/BiPO4 should be mainly attributed to the synergistic effects, including the extended light response range and enhanced charge separation. The possible charge transfer pathway and photocatalytic mechanism of the Bi/BiPO4 nanorods were also discussed. The present work may provide a convenient strategy to improve the photocatalytic performance of BiPO4 catalysts for environmental purification.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Recently, semiconductor-based photocatalysts have been extensively investigated for their promising applications in environmental purification and energy conversion [1–10]. As a semiconductor, BiPO4 has also drawn considerable attention due to its excellent photocatalytic oxidation ability and chemical stability [11]. Nevertheless, the wide band gap
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https://doi.org/10.1007/s10854-020-04609-8
and low charge separation efficiency of BiPO4 obstruct its practical applications [12]. To broaden the light absorption range and boost the charge carrier transfer and separation, several strategies, including morphology and size control, impurity atom doping, precious metal deposition, and coupling with other semiconductors, have been developed to overcome these drawbacks [13–17]. As discovered by recent researches, precious metal deposition on semiconductor is a valid way to achieve high photocatalytic
J Mater Sci: Mater Electron
activity because the Schottky barrier formed at the interface of semiconductor and noble metal would boost the separation efficiency of photoexcited charge carriers [18–21]. Moreover, loading noble metal nanoparticle also can extend the light absorption range of photocatalysts owing to their surface plasmon resonance (S
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