Uluslararası İleri Doğa Bilimleri ve Mühendislik Araştırmaları Dergisi Sayı 7, S. 31-38, 7, 2023 © Telif hakkı IJANSER’e aittir Araştırma Makalesi https://as-proceeding.com/index.php/ijanser ISSN: 2980-0811 International Journal of Advanced Natural Sciences and Engineering Researches Volume 7, pp. 31-38, 7, 2023 Copyright © 2023 IJANSER Research Article 31 Experimental Photodegradation of OPs and CBs by Advanced Oxidation Techniques in the Aqueous TiO2 Suspensions Bahar EREN 1* , Yelda YALÇIN GÜRKAN 2 1 Vocational School of Social Sciences, Tekirdag Namık Kemal University, Turkey 2 Department of Chemistry, Tekirdag Namık Kemal University, Turkey * beren@nku.edu.tr Email of the corresponding author (Received: 27 July 2023, Accepted: 09 August 2023) (1st International Conference on Modern and Advanced Research ICMAR 2023, July 29-31, 2023) .ATIF/REFERENCE: Eren, B. & Yalcın Gürkan, Y. (2023). Experimental Photodegradation of OPs and CBs by Advanced Oxidation Techniques in the Aqueous TiO2 Suspensions. International Journal of Advanced Natural Sciences and Engineering Researches, 7(7), 31-38. Abstract – The reaction of pesticides with the OH radical, is the most dominant annihilation reaction of the atmosphere. Phosmet, Azamethiphos, Coumaphos and Temephos were used as organophosphorous pesticides, and Methiocarb, Carbofuran and Pirimicarb compounds were used as carbamate pesticides with the aim of investigating the kinetics of the reactions of Organophosphorous (OPs) and Carbamate (CBs) Pesticides with the OH radicals. In aqueous TiO2 suspensions, the degradation reactions via photocatalytic-effect of the seven pesticides selected as pollutants were analysed, and the impact of the initial concentration was calculated. All experiments were conducted in the same photoreactor and under the same conditions as three repetitions. The optimum amount of photocatalyst for the studied pesticide was determined and TiO2 concentration for all experiments were taken as 0.2 g/100 mL. Considering that organic pollutants are present in water in trace amount, the initial concentrations for all organic compounds were added so as to be1.0x10 -4 molxL -1 , into the suspensions and the solution containing the organic pollutant. In this study, degradation speed of pesticides were determined experimentally, and the fastest degrading pesticide was tried to be found out. Keywords – OPs, CBs, Photodegradation, TiO2, Pesticides I. INTRODUCTION The harmful effect of organic pollutant on human health is becoming gradually severe with the development of industry and agriculture [1]-[2]. Due to their stable chemical structure, these pollutants are resistant to biological and photocatalytic degradation; thus alternative and effective treatment process for them is essential. Recently, it has been witnessed that innovative technologies have been developed, and advanced oxidation processes have been used to remove organic residues. Basically, photocatalytic processes, using semiconductors, which can generate reactive OH radicals when exposed to UV-radiation were analysed in detail [3]-[4]. Photocatalytic oxidation is one of the advanced technologies used for the removal of pollutants due to the mineralization activities of organic pollutants. In an ideal condition, this process generates carbondioxide, water, and inorganic