Investigation of photocatalytic and luminescence properties of Na0.5Ce0.5WO4 self-assembled photocatalysts under solar light irradiation: Morphological,temperature and pH role |
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| Affiliation: | 1. Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, CS 60584, Toulon, Cedex 9, F-83041, France;2. Université de Toulon, Aix Marseille Université, CNRS/INSU, IRD, MIO UM 110, CS 60584-83041, Toulon, CEDEX 9, France;1. College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining, 810000, China;2. Academy of Plateau Science and Sustainability, Qinghai Normal University, Xining, 810016, PR China;3. College of Mechanical Engineering, Qinghai University, Xining, 810016, China;4. Guandu School of Kunming No.1 Middle School, Kunming, 650206, China;1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China;2. School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, Guangdong, 519082, China;3. State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China;1. College of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China;2. Shandong Institute of Mechanical Design and Research, Jinan, China;3. Science and Technology Service Platform of Shandong Academy of Sciences, Jinan, China;1. Departamento de Odontologia Restauradora, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil;2. Departamento de Biomateriais e Biologia Oral, Faculdade de Odontologia, Universidade de São Paulo, São Paulo, SP, Brazil;3. Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN, São Paulo, SP, Brazil;4. Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil |
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| Abstract: | Tungstate-based scheelite structures have attracted much attention for the photocatalytic, adsorption and luminescence. To improve their performance, several ways have been considered, such as morphology control, thermal treatment and nanostructuring materials. In this work, three uniform and homogeneous morphologies, such as spindles, spheres and flowers, of self-assembled three-dimensional Na0.5Ce0.5WO4 were used as photocatalysts for methylene blue dye photodegradation under solar irradiation. Depending on morphology, they required different temperatures to reach crystallization. Thermal treatments at 500 °C and 800 °C resulted in changes in crystallite size, porosity, surface state, but also in bandgap and emission properties. Thus, the crystallite sizes are about 50 nm for samples (spindles and flowers) treated at 500°Cand 87–167 nm for those treated at 800 °C. Their respective bandgap values measured by diffuse reflectance were 2.85 eV beyond 3.15 eV. The samples treated at 500 °C showed a lower emission and a longer charge carrier lifetime. A strong trend to adsorption was revealed, especially at low pH value and for the samples treated at 500 °C, reaching 100% at a pH value of 2.5. With decreasing pH, the photocatalysis activity increases (up to 50%), being also more efficient with catalysts treated at low temperature. It follows that the degradation efficiency of spindles treated at 500 °C is clearly higher compared to other morphologies treated at different temperature, and suitable for solar photocatalysis. |
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| Keywords: | Tungstates Nanostructure Photocatalyst Bandgap Fluorescence Lifetime |
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