Optimization of Alachlor Photocatalytic Degradation with Nano-TiO 2 in Water under Solar Illumination: Reaction Pathway and Mineralization

Md. Ashraful Islam Molla, Mai Furukawa, Ikki Tateishi, Hideyuki Katsumata and Satoshi Kaneco
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Md. Ashraful Islam Molla: Department of Applied Chemistry & Chemical Engineering, Faculty of Engineering & Technology, University of Dhaka, Dhaka 1000, Bangladesh
Mai Furukawa: Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
Ikki Tateishi: Mie Global Environment Center for Education & Research, Mie University, Tsu, Mie 514-8507, Japan
Hideyuki Katsumata: Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
Satoshi Kaneco: Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan

Clean Technol., 2018, vol. 1, issue 1, 1-13

Abstract: In the present study, the photocatalytic degradation of alachlor was investigated using TiO 2 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 ( E a ) 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.

Keywords: photocatalytic degradation; reaction pathways; mineralization; alachlor; sunlight (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2018
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