Molybdenum doped TiO2 nanocomposite coatings: Visible light driven photocatalytic self-cleaning of mineral substrates |
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| Affiliation: | 1. University of Novi Sad, Faculty of Technology, Bul. cara Lazara 1, 21000 Novi Sad, Serbia;2. University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovića 4, 21000 Novi Sad, Serbia;1. University of Novi Sad, Faculty of Technology, Bul. Cara Lazara 1, 21000 Novi Sad, Serbia;2. University of Novi Sad, Faculty of Technical Science, Trg Dositeja Obradovića 1, 21000 Novi Sad, Serbia;1. Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, P.O. BOX 53714-161, Tabriz, Iran;2. Department of Chemistry, Payame Noor University, P.O. BOX 19395-3697, Tehran, Iran;1. Department of Chemical Engineering, McGill University, 3610 University Street, Montreal, Quebec H3A 2B2, Canada;2. Department of Chemical Engineering, University of Engineering and Technology, Peshawar, P.O Box 814, University Campus, Peshawar 25120, Pakistan;1. Department of Physics, The University of the West Indies, Mona Campus, Jamaica;2. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur 522510, India;3. Department of Physics, Krishna University-PG Centre, Nuzvid 521 201, India;4. Department of Physics, National Institute of Technology, Warangal 506 004, India |
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| Abstract: | The molybdenum doped TiO2 nanocomposite layer double hydroxide (LDH) suspensions, Mo:TiO2-LDHs, were synthesized by a wet impregnation method in order to enhance the pure TiO2 (water suspension) photocatalytic activity and consequently its self-cleaning efficiency under exposure to visible light. The aim was to produce nanocomposites by a simple, energy saving and cost beneficial synthesis. The mass ratio Mo/Ti was systematically varied (0.03, 0.06, 0.09, 0.12). The obtained nanocomposite Mo:TiO2-LDH suspensions were first characterized by UV–vis spectroscopy (band-gap energies), Zeta-sizer (particle size distribution and stability) and X-ray diffraction (XRD) (structure) and then applied onto the model mineral substrates, brick and stone. The photocatalytic activity of the obtained coating was determined based on the degradation kinetics of the Rhodamine B (RhB) under artificial visible light irradiation (white LED). The obtained results were compared to the ones of the unmodified TiO2-LDH suspension. The obtained results also showed that all prepared nanocomposites have good photocatalytic activity, particularly the suspension Mo:TiO2-LDH with the Mo/Ti 0.03 mass ratio which possesses the best value. In addition, as regards the visible light driven self-cleaning effect, this suspension has proven to be a good protective functional coating for porous mineral substrates (bricks and stones). |
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| Keywords: | B. Nanocomposites C. Photocatalytic activity E. Functional applications |
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