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Received April 29, 2021
Accepted July 2, 2021
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Highly efficient bi-metallic bismuth-silver doped TiO2 photocatalyst for dye degradation
Department of Chemical Engineering, Manipal University Jaipur, Dehmikalan, Jaipur-303007, Rajasthan, India 1Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, Maharashtra, India, Korea
anandgupta.chakinala@jaipur.manipal.edu, a.g.chakinala@gmail.com
Korean Journal of Chemical Engineering, December 2021, 38(12), 2468-2478(11), 10.1007/s11814-021-0890-5
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Abstract
Several mono-and bi-metallic photocatalysts with different loadings have been synthesized using ultrasound assisted sol gel and wet impregnation methods. Synthesized catalysts were characterized using various analytical techniques to determine the bandgap, functional groups, crystallinity, and surface morphology. Photocatalytic performance of the different catalysts was compared in terms of Rhodamine-B dye degradation, and further process optimization studies were carried out to achieve the maximum extent of degradation. Catalyst performance was studied both under UV and visible light irradiation for the degradation of different dyes. Compared to pure TiO2 and monometallic Ag or Bi doped on TiO2, bi-metallic Bi-Ag on TiO2 catalyst synthesized using wet impregnation was found to be highly active under the conditions investigated. Complete degradation (~100%) was obtained within shorter duration in the presence of minimal catalyst loading (60mg/L). Overall, this work has clearly demonstrated the higher catalytic activity of bi-metallic catalyst, which is attributed to the synergistic effect of Bi and Ag on TiO2 facilitating the efficient charge separation and improved e transfer combined with high ability to absorb in visible light region in effectively degrading organic pollutants.
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