Details

Autor(en) / Beteiligte

• Wang, Hong
• Zhang, Wendong
• Li, Xinwei
• Li, Jieyuan
• Cen, Wanglai
• Li, Qiuyan
• Dong, Fan

Titel

Highly enhanced visible light photocatalysis and in situ FT-IR studies on Bi metal@defective BiOCl hierarchical microspheres

Ist Teil von

• Applied catalysis. B, Environmental, 2018-06, Vol.225, p.218-227

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The Bi metal@defective BiOCl hierarchical microspheres was constructed and exhibited highly enhanced visible light photocatalysis. The in situ FT-IR was employed the reveal the mechanism of photocatalytic NO oxidation. [Display omitted] •The 3D plasmonic Bi metal@defective BiOCl was firstly constructed.•The enhanced performance can be ascribed to oxygen vacancies and Bi metal.•The oxygen vacancies in BiOCl induce the formation of an intermediate level.•The SPR effect of Bi metal promotes of the charge carrier separation.•The photocatalytic mechanism was revealed by in situ FT-IR. 3D plasmonic Bi metal@defective BiOCl hierarchical microspheres were constructed by a one-step solvothermal method. The effects of solvent thermal temperature on the microstructure and the photocatalytic performance were investigated. The photocatalyst prepared at 200°C (Bi/BiOCl-200) showed most efficient visible photocatalytic activity for NOx removal. The enhanced activity can be ascribed to synergistic effects of oxygen vacancies and Bi metals. The oxygen vacancies in BiOCl induce the formation of an intermediate level to allow electrons transition from the valence band to intermediate level and then to the conduction band as revealed by density functional theory (DFT). The surface plasmon resonance (SPR) effect of elemental Bi enables the improvement of the visible light absorption efficiency and the promotion of the charge carrier separation as evidenced from the charge difference distribution between Bi atoms and Bi-O layers in BiOCl. The NO adsorption and reaction processes on Bi/BiOCl-200 were dynamically monitored by in situ infrared spectroscopy (FTIR). The mechanism of Bi metals and oxygen vacancies co-mediated photocatalytic performance on Bi/BiOCl was proposed based on the results of intermediate products analysis, radicals trapping and DFT calculation. The present work could provide new insights into the mechanistic understanding of the non-noble metal Bi-based plasmonic photocatalysts and offer a new technique to reveal the mechanism of gas-phase photocatalytic reaction.