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Hasan, A K M Maksudul; Dey, Shaikat Chandra; Rahman, Muhammad Mominur; Zakaria, Abdullah Muhammad; Sarker, Mithun; Ashaduzzaman, MD; Shamsuddin, Sayed MD
Bulletin of materials science, 12/2020, Letnik: 43, Številka: 1Journal Article
Solar-assisted photocatalytic degradation of organic pollutants has emerged as efficient technology for the effective treatment of industrial wastewater. Here, we report a simple technique for the fabrication of a novel ternary photocatalyst from kaolinite (K), TiO 2 (T) and ZnO (Z). The most efficient catalyst was prepared at a calcination temperature of 600 ∘ C . The fabricated ternary composite was characterized using different analytical techniques including Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, field emission-scanning electron microscopy and energy dispersive X-ray spectroscopy. The photocatalytic degradation was performed at room temperature ( 25 ∘ C ) using Remazol Red (RR), an anionic azo dye, as the model compound. A maximum of 98% degradation of RR was found with the ternary catalyst K 0.50 T 0.45 Z 0.05 , which was prepared from 50% kaolinite (w/w), 45% TiO 2 (w/w) and 5% ZnO (w/w). The catalyst was found to be suitable for long-term repeated applications. Mechanistic investigation through radical trapping experiments confirmed hydroxyl radicals as the potential contributor to the photocatalytic degradation of RR. It is highly expected that a novel photocatalyst design such as this will pave way towards further development of materials capable of hazardous dye removal from industrial effluents.
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