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

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...

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Bibliographic Details
Published in:J. Inst. Eng. (India) ser. E 2017-06, Vol.98 (1), p.55-63
Main Authors: Sonawane, Gunvant H., Patil, Sandip P., Shrivastava, V. S.
Format: Article
Language:English
Subjects:
Adsorption
Bentonite
Clay
Dosage
Dyes
Engineering
Nanocomposites
Original Contribution
Oxidation
Photocatalysis
Photodegradation
Safranine
Zinc oxide
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Summary: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.
ISSN:2250-2483
2250-2491
DOI:10.1007/s40034-016-0089-1