Ta/TiO2-and Nb/TiO2-Mixed Oxides as Efficient Solar Photocatalysts: Preparation, Characterization, and Photocatalytic Activity
MetadataShow full item record
Ta/TiO2- and Nb/TiO2-mixed oxides photocatalysts were prepared by simple impregnation method at different TiO2 : Nb or Ta mass ratios of 1 : 0.1, 1 : 0.5, and 1 : 1, followed by calcination at 500∘C. The prepared powders have been characterized by XRD, XPS, UV-Vis spectra, and SEM. The photocatalytic activity was evaluated under natural solar light for decolorization and mineralization of azo dye Orange II solution. The results showed that Nb/TiO2- and Ta/TiO2-mixed oxides have higher activity than the untreated TiO2 under natural solar light. The maximum activity was observed for Nb/TiO2 sample (at mass ratio of 1 : 0.1), which is characterized by the smallest crystalline size (17.79 nm). Comparing with the untreated TiO2, the solar decolorization and mineralization rates improved by about 140% and 237%, respectively, and the band gap reduced to 2.80 eV. The results suggest that the crystal lattices of TiO2 powder are locally distorted by incorporating Nb5+ species into TiO2, forming a new band energy structure, which is responsible for the absorption in the visible region. Unlike Ta/TiO2, the Nb/TiO2-mixed oxides can prevent the grain size growth of the treated TiO2, which is important to achieve high solar photoactivity.
This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons License http://creativecommons.org/licenses/by/3.0/ Please refer to the licence to obtain terms for any further reuse or distribution of this work
Showing items related by title, author, creator and subject.
Combined adsorption and oxidation technique for waste water treatment: potential application in permeable reactive barrierShukla, Pradeep (2010)This dissertation explores a combined adsorption and advanced oxidation technology for trapping and destruction of organic pollutants in waste water. The adsorbed/immobilized pollutant onto the surface of metal supported ...
Wang, Wei; Xu, X.; Liu, Yu; Zhong, Y.; Shao, Zongping (2018)Recently, there is an urgent need for alternative energy resources due to the nonrenewable nature of fossil fuels and increasing CO2greenhouse gas emissions. The photovoltaic technologies which directly utilize the abundant ...
Wang, Wei; Tadé, M.; Shao, Z. (2018)© 2017 Elsevier Ltd Semiconductor-based photocatalysis plays a vital role in counteracting worldwide environmental pollution and energy shortage. How to design a visible-light-active photocatalyst is critical for efficient ...