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A novel approach for the synthesis of visible-light-active nanocrystalline N-doped TiO2 photocatalytic hydrosol

Institution:	1. Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa,1749-016 Lisboa, Portugal;2. Adsorption and Environmental Remediation On Porous Solids (ADPOR), Dpt. Chemical Processes for Energy and Environment, Instituto Nacional del Carbón, INCAR-CSIC, Apdo. 73, 33080 Oviedo, Spain;3. Dpt. Photocatalysis and Alternative Energies, Venezuelan Institute for Scientific Research (IVIC), 20632, Caracas 1020-A, Venezuela;1. Research Unit of the National Interuniversity Consortium “The Chemistry for the Environment” and Interdepartmental Center of Environmental Science and Engineering (CINSA), University of Cagliari, Via San Giorgio 12, 09124 Cagliari, Italy;2. Center for Advanced Studies, Research and Development in Sardinia (CRS4), Loc. Piscina Manna, Building 1, 09010 Pula (CA), Italy;3. Department of Mechanical, Chemical and Materials Engineering, University of Cagliari, Piazza d’Armi, 09123 Cagliari, Italy;1. Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument, Chongqing Key Laboratory of Fiber Optic Sensor and Photodetector, Chongqing University of Technology, Chongqing 400054, China;2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China;1. Department of Science and Environmental Studies, The Education University of Hong Kong, Taipo, N.T., Hong Kong, China;2. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, PR China

Abstract:	A visible-light-active nitrogen doped nanocrystalline titanium dioxide (N–TiO₂) hydrosol was prepared by precipitation–peptization method and following with hydrothermal crystallization at 110 °C holding for 6 h. XPS results show that nitrogen ions have been doped into the TiO₂ lattice successfully and the UV–Vis absorption spectra indicate that the light absorption edge of the N-doped TiO₂ has been red-shifted into visible light region. The photocatalytic performance of the N-doped TiO₂ thin film prepared from the synthesized hydrosol was evaluated by photodegrading the gaseous formaldehyde (HCHO) under visible light irradiation. The photodegradation ratio of HCHO reached up to 90% within 24 h and the degradation ratio was stable for ten degradation cycles, indicating the prepared hydrosol has good reusable performance in photodegrading gaseous pollutants.

Keywords:	Precipitation–peptization processes Hydrothermal Photocatalytic hydrosol
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