Photocatalytic Degradation of Chlorpyrifos by Using Synthesized Nano Titanium.

Abd Elghffar, Mahmoud Samy; Mosaad, Mohamed Ahmed Abd El Hakim; El-Etriby, Hisham Khalil

doi:10.21608/bfemu.2020.98052

Photocatalytic Degradation of Chlorpyrifos by Using Synthesized Nano Titanium.

Document Type : Research Studies

Authors

¹ Demonstrator, Public Works Dept.,Faculty of Engineering,Mansoura University, Egypt

² Lecturer, Public Works Dept., Faculty of engineering, Mansoura University, Egyp

³ Professor of Public Works, Faculty of engineering, Mansoura University, Egypt

10.21608/bfemu.2020.98052

Abstract

Chlorpyrifos is one of the most popular used organophosphorus pesticides because of its low cost and high efficiency in controlling pests in agriculture. Presence of pesticides in aquatic environments causes serious problems to living organisms. Photocatalysis considers an effective route for the removal of resistant hazardous organic wastes from aqueous solutions. In this study, the photocatalytic degradation of chlorpyrifos in aqueous solution by using synthesized prepared nano titanium dioxide (TiO₂) by sol-gel method was investigated under various operational conditions such as catalyst dose, pH of the solution, initial concentration of chlorpyrifos and illumination time. Energy dispersive X-ray Spectroscopy (EDX) and Thermo gravimetric analysis (TGA) were used for the nano TiO₂ characterization. The results depicted that the photocatalytic degradation of chlorpyrifos was strongly influenced by the operational parameters. The photocatalytic degradation decreased with increasing the initial concentration of chlorpyrifos. Neutral pH of the solution is the optimum for the photocatalytic degradation of chlorpyrifos. The photocatalytic reactions approximately followedPseudo-first order kinetics and the reaction rate was inversely related to the feed concentrations. A model was performed with regression coefficient of 88.45 % to express the relation between removal efficiency and operational conditions.

Keywords