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Photocatalytic Degradation of Safranine by ZnO–Bentonite: Photodegradation versus Adsorbability

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Abstract

ZnO–bentonite nanocomposite was obtained by incorporation of bentonite clay with ZnO. The effects of pH, contact time, initial dye concentration and photocatalyst dose on the rate of degradation of dye solution were studied. It was observed that working conditions strongly influence the dye removal process. Contact time 70 min and pH 4 was optimized for photocatalytic degradation of Safranine. Adsorption kinetics for 20–80 mg/l dye concentration was found to follow pseudo-second-order kinetics. Adsorption of dye was described by Langmuir and Freundlich isotherm. In adsorption isotherm, Langmuir isotherm was found to fit well with experimental data than Freundlich isotherm. The monolayer adsorption capacity was found to be 50 mg/g. The amount of dye adsorbed (q t ) increases from 17.31 to 159.62 mg/g as dye concentration increases from 20 to 80 mg/l for 0.4 g/l photocatalyst dose. The photocatalytic degradation of Safranine by ZnO–bentonite takes place by advanced oxidation process.

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Acknowledgements

The authors gratefully acknowledge Central Instrumentation Centre, University Institute of Chemical Technology, NMU, Jalgaon for SEM and XRD analysis and NIT, Warangal for providing necessary characterization and valuable suggestions. Authors are also thankful to the Principal, Kisan College, Parola and Principal, G. T. Patil College, Nandurbar for providing necessary laboratory facilities.

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Authors and Affiliations

  1. Department of Chemistry, Kisan Arts, Commerce and Science College, Parola, Maharashtra, 425 111, India

    Gunvant H. Sonawane

  2. Nano-Chemistry Research Laboratory, G. T. Patil College, Nandurbar, Maharashtra, 425 412, India

    Sandip P. Patil & V. S. Shrivastava

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  1. Gunvant H. Sonawane
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  2. Sandip P. Patil
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  3. V. S. Shrivastava
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Correspondence to Gunvant H. Sonawane.

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Sonawane, G.H., Patil, S.P. & Shrivastava, V.S. Photocatalytic Degradation of Safranine by ZnO–Bentonite: Photodegradation versus Adsorbability. J. Inst. Eng. India Ser. E 98, 55–63 (2017). https://doi.org/10.1007/s40034-016-0089-1

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  • DOI: https://doi.org/10.1007/s40034-016-0089-1

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