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Treatment of malachite green dye using combined oxidation techniques based on different irradiation

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Abstract

We investigated the treatment of malachite green (MG) dye using sonocatalytic, photocatalytic and sonophotocatalytic techniques. The percentage of decolorization for sonophotolysis (65.5±3.3%) was much higher than the individual effects of sonolysis (55.2±2.4%) and photolysis (52.1±2.6%). The efficiency of the sonophotocatalytic process increased in the presence of photocatalysts such as anatase TiO2 (82.2±4.1%) and ZnO (75.7±3.8%). The decolorization rate further enhanced in the presence of nano-TiO2 (anatase, rutile ratio 75: 25 and particle size ≤100 nm). The enhancement in decolorization was marginal for sonophotocatalysis (95.9±4.8%) as compared to sonocatalysis (93.0±4.3%) and photocatalysis (93.2±4.6%). The intensification of decolorization in the presence of nano-TiO2, due to lower recombination of hydroxyl ions on the photocatalytic surface and nano-particle size of a catalyst, increased cavitational activity. The total organic carbon was found to be maximum for sonophotocatalytic in the presence of nano-TiO2 (67.1±3.3%).

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Authors and Affiliations

  1. Department of Chemical Engineering, AISSMS College of Engineering, Kennedy Road, Pune, 411001, MS, India

    Vitthal Laxmanrao Gole & Apurva Alhat

  2. Department of Material Science and Engineering, The University of Arizona, P. O. Box 210012, Tucson, Arizona, USA

    Vitthal Laxmanrao Gole

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  1. Vitthal Laxmanrao Gole
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  2. Apurva Alhat
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Correspondence to Vitthal Laxmanrao Gole.

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Gole, V.L., Alhat, A. Treatment of malachite green dye using combined oxidation techniques based on different irradiation. Korean J. Chem. Eng. 34, 1393–1399 (2017). https://doi.org/10.1007/s11814-017-0033-1

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  • DOI: https://doi.org/10.1007/s11814-017-0033-1

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