The Z-scheme heterojunction between TiO2 nanotubes and Cu2O nanoparticles mediated by Ag nanoparticles for enhanced photocatalytic stability and activity under visible light |
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| Affiliation: | 1. School of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, People''s Republic of China;1. Research Centre of Materials Science, Beijing Institute of Technology, Beijing 100081, People''s Republic of China;2. Department of Physics, COMSATS Institute of Information Technology, Islamabad 44000, Pakistan;3. National Institute of Biotechnology and Genetic Engineering (NIBGE), P.O. Box no. 577, Jhang Road, Faisalabad, Pakistan;4. Department of Physics, College of Science, Almajmaah University, P.O. Box no. 1712, Al-Zulfi 11932, Saudi Arabia;1. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China;2. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian, 116024, China;3. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China;1. Department of Electronics and Key Laboratory of Photo-Electronic Thin Film Devices and Technology of Tianjin, Nankai University, Tianjin 300350, China;2. School of Physics, The University of Sydney, NSW 2006, Australia |
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| Abstract: | The photocatalytic reduction method was used to introduce Ag nanoparticles (Ag NPs) into the Cu2O-TiO2 nanotubes (Cu2O-TNT) prepared by electrodeposition. The Z-scheme heterojunction Cu2O-Ag-TNT (CAT-4–60) catalysts were prepared. The mechanism of the transition from the traditional P-N heterojunction enhanced by noble metal to the Z-scheme heterojunction was studied. In addition, the Z-scheme heterojunction CAT-4–60 showed the highest light absorption and the highest photoelectrochemical activity under visible light, and the photoluminescence intensity was significantly reduced. Compared with the traditional P-N heterojunction CAT-2–60, not only the photocatalytic activity of the dual Z-scheme CAT-4–60 catalyst was improved, and the removal rate of MB was 98.58% higher than TNT (45.81%), CT-60 (69.49%), AT-2 (75.1%) and CAT-2–60 (91.2%),but also the stability of Cu2O in CAT-4–60 was significantly enhanced. This work reveals the potential application of noble metal nanoparticles to enhance the Z-scheme heterojunction under visible light-driven photocatalysis, and provides new insights to the transition from traditional P-N heterojunctions to Z-scheme heterojunctions. |
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| Keywords: | Visible light-driven photocatalysis Photodegradation stability |
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