Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 210, Issue -, Pages 281-291Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.08.009
Keywords
Ag/Bi/BiOCl0.8Br0.2; Near-infrared; Full-spectrum; Photocatalysis; Heterojunction
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Funding
- National Natural Science Foundation of China [61306077]
- Fundamental Research Funds for the Central Universities [JB-ZR1109, JB-ZR1212]
- Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University [ZQN-PY207]
- Discipline Innovation Team Project of Huaqiao University [201320]
- Open Project Program of Provincial Key Laboratory of Eco-Industrial Green Technology of Wuyi University
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In this work, multiple heterojunction Ag/Bi/BiOCl0.8Br0.2 photocatalysts with novel porous micro-flower structure were fabricated via a facile one-step solvothermal route and characterized systematically. The TEM and HRTEM images clearly showed the heterogeneous nanostructures at the interface between Ag/Bi and BiOCl0.8Br0.2. The as-prepared Ag/Bi/BiOCl0.8Br0.2 composites displayed a strong optical absorption in the region of 250-1500 nm, especially in the unexploited near infrared region which accounts for most of the sunlight. The multiple heterojunction photocatalyst exhibited an outstanding photocatalytic activity for the degradation of Rhodamine B under the UV, visible and NIR light irradiation, respectively. The highly enhanced photo catalytic activity was attributed to the synergistic effects, including the reduced band gap, the surface plasmon resonance effect, efficient charge separation of photo-generated electron-holes. On the basis of the radical species trapping experiments, the holes and superoxide radicals were confirmed to be the mainly active species involved in the degradation of Rhodamine B under the NIR light irradiation. This study provides a novel strategy for designing highly performance plasmonic photocatalysts under the whole solar light irradiation.
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