Preparation of black-TiO2 and its application in photocatalytic removal of methyl orange dye
237 viewsDOI:
https://doi.org/10.54939/1859-1043.j.mst.76.2021.68-73Keywords:
Photocatalysis; Black-TiO2.Abstract
For a few decades, Titanium Dioxide (TiO2) has been the most studied photocatalyst due to its significant optical property. In the paper, TiO2 pigment powder (Anatase form) was selected as a precursor to prepare a variety of Black-TiO2 samples, and the typical material was then evaluated for its photocatalytic activity in organic pollutant treatment. Some properties of Black-TiO2 were determined via common methods such as sensory analysis, X-Ray diffraction, and bandgap measurement obtained from UV-Vis spectroscopy. As a result, the material was successfully converted to more than 40% organic pollutant as Methyl Orange (C14H14N3NaO3S) for an hour, as two times higher than that of the amount converted by pristine TiO2. In addition, Black-TiO2 performed much better photocatalytic activity in an acidic medium in comparison with a neutral one, and the material also remained its activity as more than 90% after three time-continuous recycling operations.
References
[1]. S. R. Wild, T. Rudd, and A. Neller, “Fate and effects of cyanide during wastewater treatment processes,” Sci. Total Environ., vol. 156, no. 2, pp. 93–107, Nov. 1994.
[2]. S. N. Frank and A. J. Bard, “Heterogeneous photocatalytic oxidation of cyanide and sulfite in aqueous solutions at semiconductor powders,” J. Phys. Chem., vol. 81, no. 15, pp. 1484–1488, Jul. 1977.
[3]. C. Langlade, B. Vannes, T. Sarnet, and M. Autric, “Characterization of titanium oxide films with Magnéli structure elaborated by a sol–gel route,” Appl. Surf. Sci., vol. 186, no. 1–4, pp. 145–149, Jan. 2002.
[4]. X. Chen, L. Liu, P. Y. Yu, and S. S. Mao, “Increasing Solar Absorption for Photocatalysis with Black Hydrogenated Titanium Dioxide Nanocrystals,” Science (80), vol. 331, no. 6018, pp. 746–750, Feb. 2011.
[5]. A. Naldoni et al., “Effect of Nature and Location of Defects on Bandgap Narrowing in Black TiO 2 Nanoparticles,” J. Am. Chem. Soc., vol. 134, no. 18, pp. 7600–7603, May 2012.
[6]. F. Zuo, L. Wang, T. Wu, Z. Zhang, D. Borchardt, and P. Feng, “Self-Doped Ti 3+ Enhanced Photocatalyst for Hydrogen Production under Visible Light,” J. Am. Chem. Soc., vol. 132, no. 34, pp. 11856–11857, Sep. 2010.
[7]. S. Tominaka, “Facile synthesis of nanostructured reduced titanium oxides using borohydride toward the creation of oxide-based fuel cell electrodes,” Chem. Commun., vol. 48, no. 64, p. 7949, 2012.
[8]. D. Ariyanti, L. Mills, J. Dong, Y. Yao, and W. Gao, “NaBH4 modified TiO2: Defect site enhancement related to its photocatalytic activity,” Mater. Chem. Phys., vol. 199, pp. 571–576, Sep. 2017.
