Synthesis of heterostructured Bi2O3–CeO2–ZnO photocatalyst with enhanced sunlight photocatalytic activity |
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| Affiliation: | 1. Centre for Materials Science and Technology, University of Mysore, Vijnana Bhavan, P.B.No.21, Manasagangothri, Mysuru 570006, India;2. Center of Research Excellence in Nanotechnology and Physics Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;1. Department of Chemistry, VHNSN College, Virudhunagar 626 001, Tamil Nadu, India;2. School of Chemistry, Madurai Kamaraj University, Madurai 625 021, Tamil Nadu, India;1. School of Chemistry & Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. School of Environment, Jiangsu University, Zhenjiang 212013, PR China;3. Institute of Green Chemistry and Chemical Technology, Jiangsu University, Zhenjiang 212013, PR China;1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Program of Physics, Faculty of Science, Ubon Ratchathani Rajabhat University, Ubon Ratchathani 34000, Thailand;3. Materials Science Research Centre, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;4. National Nanotechnology Center, Thailand Science Park, Phahonyothin Road, Klong 1, Klong Luang 12120, Phathumthani, Thailand;1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China;2. Nanjing AIREP Environmental Protection Technology Co., Ltd, Nanjing, Jiangsu 210091, PR China;1. Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, A.P. 70-186, Delegación Coyoacán, C.P. 04510, Cd. Mx. México;2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, A. P. 70-360, Coyoacán, C.P. 04510, Cd. Mx. México;1. Center for Materials Science and Technology, University of Mysore, Vijana Bhavana, Manasagangothiri, Mysuru 570006, India;2. Department of Materials Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen 518055, PR China;3. Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;4. King Abdullah University of Science and Technology (KAUST), Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, Thuwal 23955-6900, Saudi Arabia;5. Department of Studies and Research in Industrial Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577 451, India;6. DOS in Earth Science, University of Mysore, Manasagangothiri, Mysuru 570006, India;7. Department of Microbiology and Biotechnology, Jnana Bharathi Campus, Bangalore University, Bangalore 560056, India;8. Energy and Environmental Remediation Lab, SRM-Research Institute, SRM Institute of Science and Technology, Chennai 603203, India;9. Adichunchanagiri University, N.H.75, B. G. Nagara, Mandya District 571448, India |
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| Abstract: | The development of heterostructured semiconductor photocatalysts makes a noteworthy advancement in environmental purification technology. In this work, a novel heterostructured Bi2O3?CeO2?ZnO, fabricated by a combination of microwave-assisted hydrothermal and thermal decomposition methods, showed an enhanced photocatalytic activity for Rhodamine B (RhB) degradation under sunlight, as compared to pristine ZnO, Bi2O3, CeO2, and commercial Degussa TiO2-P25. The obtained products were thoroughly characterized by various techniques including X- ray powder diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), elemental color mapping, energy-dispersive X-ray spectroscopy (EDAX), Raman spectrometry, Fourier transform infrared (FT-IR) spectroscopy, UV–visible diffuse reflectance spectroscopy (UV–vis DRS), and photoluminescence (PL) spectroscopy. PXRD analysis reveals that the heterostructure has the monoclinic lattice phase of α-Bi2O3, the cubic phase of CeO2 and the hexagonal wurtzite phase of ZnO. FE-SEM images show that Bi2O3?CeO2?ZnO has an ordered mixture of nanorod and nanochain structures. EDAX, elemental color mapping, Raman and FT-IR analyses confirm the successful formation of the heterostructured Bi2O3?CeO2?ZnO. The UV–Vis DRS results demonstrate that Bi2O3?CeO2?ZnO exhibits wide visible-light photoabsorption in 400–780 nm range. Moreover, the reduction in PL intensity of the heterostructured Bi2O3?CeO2?ZnO, when compared to the pristine Bi2O3, CeO2, and ZnO, indicates enhanced charge separation. The study on the mechanism displayed that the improved photocatalytic activity of Bi2O3?CeO2?ZnO could be attributed to (1) the efficient separation of photoinduced electrons and holes of the photocatalysts, caused by the vectorial transfer of electrons and holes among ZnO, CeO2 and Bi2O3, and (2) the wide visible-light photoabsorption range. This study introduces a new class of promising sunlight-driven photocatalysts. |
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| Keywords: | Photocatalysis B Nanocomposites C Optical properties |
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