Enhancement in the photo-electrocatalytic activity of SnO 2 -Sb 2 O 4 mixed metal oxide anode by nano-WO 3 modification: Application to trypan blue dye degradation

Subba Rao, Anantha N and Venkatarangaiah, Venkatesha T and Nagarajappa, Giridhar B and Nataraj, Shubha H and Krishnegowda, Pavithra M (2017) Enhancement in the photo-electrocatalytic activity of SnO 2 -Sb 2 O 4 mixed metal oxide anode by nano-WO 3 modification: Application to trypan blue dye degradation. In: Journal of Environmental Chemical Engineering, 5 (5). pp. 4969-4979. ISSN 22133437

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Abstract

The SnO2-Sb2O4 (MMO) and SnO2-Sb2O4-WO3 (MMO-WO3) electrodes were prepared by electrodeposition followed by dip coating and characterized by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) analysis. The electrochemical (EC) and photoelectrochemical (PEC) degradation studies were carried out on trypan blue (TB) dye. These studies revealed that the characteristics and performance of MMO electrode improved significantly on nano-WO3 modification. The oxygen evolution potential (OEP) increased from 2.07 V (vs Ag/AgCl) to 2.21 V and the accelerated service life increased by 1.7 times. 88 and 93% color removal was achieved on electrolysis for 240 min using MMO electrode; whereas, 100% color removal was achieved within 120 min by both EC and PEC using MMO-WO3. The percentage chemical oxygen demand (COD) removal achieved using MMO electrode by EC and PEC were only 60 and 63% respectively; whereas, it increased to 78 and 84% with MMO-WO3 electrode. A probable pathway for TB degradation was proposed on the basis of liquid chromatography-mass spectrometry (LC-MS) analysis and quantum chemical calculations were performed on TB molecule to corroborate the proposed degradation pathway.

Item Type:	Journal Article
Publication:	Journal of Environmental Chemical Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Degradation; Electrochemical oxidation; Mixed metal oxide; Nano-WO3 modification; Photoelectrochemical oxidation; Trypan blue
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	31 May 2022 04:33
Last Modified:	31 May 2022 04:33
URI:	https://eprints.iisc.ac.in/id/eprint/72847

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