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Optimization of Alachlor Photocatalytic Degradation with Nano-TiO2 in Water under Solar Illumination: Reaction Pathway and Mineralization

1
Department of Applied Chemistry & Chemical Engineering, Faculty of Engineering & Technology, University of Dhaka, Dhaka 1000, Bangladesh
2
Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
3
Mie Global Environment Center for Education & Research, Mie University, Tsu, Mie 514-8507, Japan
*
Author to whom correspondence should be addressed.
Clean Technol. 2018, 1(1), 141-153; https://doi.org/10.3390/cleantechnol1010010
Received: 26 July 2018 / Revised: 17 September 2018 / Accepted: 17 September 2018 / Published: 19 September 2018
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Abstract

In the present study, the photocatalytic degradation of alachlor was investigated using TiO2 under sunlight irradiation. The effects of some operational parameters, such as photocatalyst concentration, temperature, pH, sunlight intensity and irradiation time, were optimized. The kinetics of photodegradation was found to follow a pseudo-first-order kinetic law, and the rate constant at optimal condition is 0.245 min−1. The activation energy (Ea) is 6.4 kJ/mol. The alachlor mineralization can be completed under sunlight irradiation after 10 h. The formations of chloride, nitrate and ammonium ions are observed during the photocatalytic degradation. The eight photoproducts were identified by the GC–MS technique. The photodegradation reaction pathways are proposed based on the evidence of the detected photoproducts and the calculated frontier electron densities of the alachlor structure. The photocatalytic degradation treatment for the alachlor wastewater under solar irradiation is simple, convenient and low cost. View Full-Text
Keywords: photocatalytic degradation; reaction pathways; mineralization; alachlor; sunlight photocatalytic degradation; reaction pathways; mineralization; alachlor; sunlight
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Molla, M.A.I.; Furukawa, M.; Tateishi, I.; Katsumata, H.; Kaneco, S. Optimization of Alachlor Photocatalytic Degradation with Nano-TiO2 in Water under Solar Illumination: Reaction Pathway and Mineralization. Clean Technol. 2018, 1, 141-153.

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