Trash GGBFS-based geopolymer as a novel sunlight-responsive photocatalyst for dye discolouration |
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| Authors: | Leena V Bora Manan Rathod Kush Kapadia Sonal Thakkar RN Reddy Sandesh S Chougule Nisha V Bora |
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| Institution: | 1. Department of Chemical Engineering, Nirma University, Ahmedabad, India;2. Department of Civil Engineering, Nirma University, Ahmedabad, India;3. Department of Chemical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ, London, UK;4. Department of Mechanical Engineering, Government Engineering College, Modasa, India |
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| Abstract: | In this study, we report a waste material-ground granulated blast furnace slag (GGBFS) as a low cost geopolymer, hybridised with ZnO to form a novel and efficient photocatalyst capable of discolouring textile wastewater. GGBFS is a waste material in an iron industry. Methylene blue was used as the probe dye and natural sunlight was used for activation of the photocatalyst. It was observed that under the experimental conditions, ZnGP-40 exhibited twice the discoloration efficiency than conventionally used ZnO or TiO2. This enhanced performance is majorly attributed to increased surface area of ZnO when strewn in the GGBFS matrix. The photocatalysts were characterized by SEM, TEM, PSA, TGA, BET and UV–Vis/NIR. The effect of photocatalyst loading, speed of agitation and solar insolation has also been studied. Since this study has been performed in direct sunlight, it exhibits a realizable application of solar energy in the treatment of wastewater. |
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| Keywords: | Photocatalysis GGBFS Geopolymer Wastewater Solar energy Methylene blue |
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