Title: Treatment of 4-hydroxyphenylazobenzene (yellow azo dye) using microwave-photocatalysed reactor

Authors: Archana Nagawade; Vitthal L. Gole

Addresses: Department of Chemical Engineering, AISSMS College of Engineering, Pune-411001, Maharashtra, India ' Department of Chemical Engineering, Madan Mohan Malaviya University of Technology, Deoria Road, Gorakhpur – 273010, Uttar Pradesh, India

Abstract: Present work investigates treatment of hazardous and persistence 4-hydroxyphenylazobenzene (yellow azo dye) using intensified technologies such as photocatalysis (UV), microwave (MW) and sequential effects of microwave and photocatalysis (MW-UV). The treatment studies were further investigated in the presence of hydroxyl radical promoters such as hydrogen peroxide, copper oxide and titanium oxide. Our results confirmed that the maximum degradation was obtained for MW-UV compare to individual effects of MW and UV. It was 91.6±4.3% in the presence of titanium dioxide for MW-UV effect. TOC removal and degradation rate was 44.6±2.2% and 43.3±2.3 min^-1, respectively. The synergy of thermal and non-thermal effects of microwave and formation of active sites during photocatalysis is beneficial for enhancing degradation rate. The technologies based on synergic effects of MW and UV have better potential for treatment of environmentally persistence compounds.

Keywords: yellow azo dye; microwave; photocatalysis; hydroxyl radicals; and wastewater treatment.

DOI: 10.1504/IJEE.2019.102378

International Journal of Environmental Engineering, 2019 Vol.10 No.2, pp.93 - 105

Received: 29 Oct 2018
Accepted: 29 Mar 2019
Published online: 23 Sep 2019 *

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