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Photocatalysts for Organics Degradation
Open AccessArticle

Eco-Toxicological and Kinetic Evaluation of TiO2 and ZnO Nanophotocatalysts in Degradation of Organic Dye

by Sajjad Khezrianjoo 1,†, Jechan Lee 2,†, Ki-Hyun Kim 1,* and Vanish Kumar 3,*
1
Air Quality & Materials Application Lab, Department of Civil & Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Korea
2
Department of Environmental and Safety Engineering, Ajou University, 206 Worldcup-ro, Suwon 16499, Korea
3
National Agri-Food Biotechnology Institute (NABI), S.A.S. Nagar, Punjab 140306, India
*
Authors to whom correspondence should be addressed.
These authors are co-first authors as they contributed equally.
Catalysts 2019, 9(10), 871; https://doi.org/10.3390/catal9100871
Received: 22 September 2019 / Revised: 13 October 2019 / Accepted: 15 October 2019 / Published: 21 October 2019
(This article belongs to the Special Issue Nanomaterials in Photo(Electro)catalysis)
In this study, the photocatalytic degradation of azo dye “Food Black 1” (FB1) was investigated using TiO2 and ZnO nanoparticles under ultraviolet (UV) light. The performances of the two photocatalysts were evaluated in terms of key parameters (e.g., decolorization, dearomatization, mineralization, and detoxification of dye) in relation to variables including pre-adsorption period, pH, and temperature. Under acidic conditions (pH 5), the ZnO catalyst underwent photocorrosion to increase the concentration of zinc ions in the system, thereby increasing the toxic properties of the treated effluent. In contrast, TiO2 efficiently catalyzed the degradation of the dye at pH 5 following the Langmuir–Hinshelwood (L–H) kinetic model. The overall results of this study indicate that the decolorization rate of TiO2 on the target dye was far superior to ZnO (i.e., by 1.5 times) at optimum catalyst loading under UV light. View Full-Text
Keywords: azo food dye; eco-toxicity; Langmuir–Hinshelwood kinetics; photocatalysis; photocorrosion; nanoparticles azo food dye; eco-toxicity; Langmuir–Hinshelwood kinetics; photocatalysis; photocorrosion; nanoparticles
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Khezrianjoo, S.; Lee, J.; Kim, K.-H.; Kumar, V. Eco-Toxicological and Kinetic Evaluation of TiO2 and ZnO Nanophotocatalysts in Degradation of Organic Dye. Catalysts 2019, 9, 871.

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