Study on the influence of various base agents in K2TiF6 hydrolysis on morphology, structure and photocatalytic activity of TiO2
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DOI:
https://doi.org/10.15625/2525-2321.2017-00449Keywords:
K2TiF6, TiO2, Ti(OH)4, photocatalystAbstract
K2TiF6 was hydrolyzed by various base agents including solutions of NH3, NaOH, and KOH at the same concentration of 3 M. TiO2 material was obtained after filtering, washing, drying and calcination at 500 °C of Ti(OH)4 precipitate. The experimental results showed that there was a significant influence of base agent nature on the morphology, structure, surface area of TiO2 product. Using NH3 agent could obtain uniform TiO2 particles with about 15 nm in size and surface area of 98.93 m2.g-1, while using NaOH or KOH led to TiO2 with varying particle sizes (in the range of 15-500 nm), and decreasing surface area (less than 20 m2.g-1). The nature of base agent also significantly influenced photocatalytic activity of TiO2 product for methylene blue (MB) decomposition. The prepared TiO2 from NH3-using process showed the highest phtocatalytic activity in comparison with TiO2 from KOH/NaOH-using process or commercial TiO2 (P25).
Keywords. K2TiF6, TiO2, Ti(OH)4, photocatalyst.Downloads
References
Lofrano G. Rizzo, L. Grassi, M. Belgiorno, V. Advanced oxidation of catechol: A comparison among photocatalysis, fenton and photo-fenton processes, Desalination, 249, 878-883 (2009).
Vilar V. J. P. Pinho, L. X. Pintor, A. M. A. Boaventura R. A. R. Treatment of textile wastewaters by solar-driven advanced oxidation processes, Sol. Energy, 85, 1927-1934 (2011).
Nguyen Tan Lam, Tran Duy Dam, Nguyen Thi Dieu Cam, Nguyen Van Noi. A study on preparation K2TiF6 from ilmenite by hydrofluoric acid leaching, Journal of chemistry, 53(4e1), 47-50 (2015).
Parsons S. Advanced Oxidation Processes for Water and Wastewater Treatment, IWA Publishing, London, UK, (2004).
Nguyen Tan Lam, Pham Minh Hoang, Nguyen Phi Hung, Nguyen Thi Dieu Cam, Nguyen Thi Hanh, Nguyen Van Noi. Preparation of titanium dioxide from potassium fluorotitanate by hydrolysis method in
ammonia solution, Journal of chemistry, 53(5e3), 147-151 (2015).
Pradyot Patnaik. Handbook of inorganic Chemicals, McGraw-Hill Publishing Company, New York, (2003).
Li Q., Sun D., Kim H. Fabrication of porous TiO2 nanofiber and its photocatalytic activity, Materials Research Bulletin, 46(11), 2094-2099 (2011).
Kazrya Nataka, Akira Fujishma. TiO2
photocatalysis: Design and application, Journal of
photochemistry and photobiology, 13(3), 169-189
(2012).
