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The present study aims to use green synthesized TiO₂ as a photocatalyst in suspended and immobilized form under UV light to efficiently degrade a combination of reactive dyes, namely titan yellow, methyl orange, rhodamine B, and methylene blue.TiO₂ nanoparticles (NPs) were synthesized using Tamarindus indica leaf extract and were utilized to parametrically study photo-degradation at room temperatureThe green synthesized NPs were characterized by Powder XRD, SEM, and FTIR techniques to understand the crystalline phase/purity, morphol., and functional groups resp.The TiO₂ in suspension under UV light showed >90% degradation towards a 10 ppm composite dye at a loading of 1.5 gL^-1, pH 7, and an irradiation time of 120 min.Subsequently, TiO₂ was further immobilized in-situ, on inert supports of perlite granules and glass and studied for catalytic activity in batch and continuous modes.The TiO₂ nanoparticles immobilized on perlite granules and glass showed 59 and 48% degradation in batch operation under the same conditions as in suspended form.In continuous mode, the highest degradation activity was recorded at 2 Lh^-1 after 4 passes.Further, kinetic studies reveal that the degradation reaction is best described by Langmuir Hinshelwood kinetics for both suspended and immobilized TiO₂.

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