Enhanced photocatalytic–electrolytic degradation of Reactive Brilliant Red X-3B in the presence of water jet cavitation |
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| Institution: | 1. Cracow University of Technology, Jana Paw?a II 37 Street, Cracow, Poland;2. ABB Corporate Research, Starowislna 13A Street, Cracow, Poland;3. Warsaw University of Technology, Woloska 141 Street, Warsaw, Poland;1. Department of Mechanical Engineering, SSN College of Engineering, Chennai-603110, India;2. Department of Mechanical Engineering, Dhanalakshmi Srinivasan College of Engineering and Technology, Mamallapuram-603104, India;3. Department of Industrial Engineering, Anna University, Chennai-600025, India;1. College of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, PR China;2. School of Science, Xi’an University of Posts and Telecommunications, Xi’an 710121, PR China;1. Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada;2. Key Laboratory of Cluster Science (Ministry of Education), School of Chemistry, Beijing Institute of Technology, Beijing 100081, PR China;3. Laboratoire de Chimie Organique Fine et Hétérocyclique, IRCOF, INSA de Rouen, 76131 Mont Saint Aignan Cedex, France;1. Melanoma Institute Australia, The University of Sydney, Sydney, Australia;2. Department of Dermatology, University of Chile, Santiago, Chile;3. Faculty of Medicine and Health, University of New South Wales, Sydney, Australia;4. Sydney Melanoma Diagnostic Centre, Royal Prince Alfred Hospital, Sydney, Australia |
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| Abstract: | Photocatalysis, electrolysis, water jet cavitation (WJC), alone and in combinations were applied to degrade an azo dye, Reactive Brilliant Red X-3B (X-3B). Experiments were conducted in a 4.0 L aqueous solution with different initial dye concentrations, TiO2 dose, and solution pH. WJC substantially increased the photocatalytic, electrolytic and photocatalytic–electrolytic rates of the dye removal. The observed first-order rate of X-3B decolorization in the process of combined photocatalysis and electrolysis coupled with WJC was 1.6–2.9 times of that in the process of combined photocatalysis and electrolysis coupled with mechanical stirring. The rate enhancements may be attributed primarily to the reduced diffusion layer thickness on the electrodes and the deagglomeration of photocatalyst particles due to the chemical and physical effects of WJC. Under the conditions of 80 mg/L X-3B solution, 100 mg/L TiO2 dose and solution pH 6.3, 97% and 71% of color and chemical oxygen demand (CODCr) were removed, respectively, within 90-min photocatalytic–electrolytic treatment coupled with WJC. During this process, azo groups and naphthalene, benzene and triazine structures of the dye can be destroyed. Industrial textile effluent was also investigated, and a positive synergistic effect between photocatalytic–electrolytic system and WJC was observed considering color removal. |
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| Keywords: | Photocatalysis Electrolysis Jet cavitation Dye Synergy |
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