Removal of carbaryl pesticide in aqueous solution by UV and UV/hydrogen peroxide processes

ABSTRACT

The objective of this work to evaluate the synergetic influence of UV and UV/H₂O₂ in the decomposition of carbaryl in the aqueous medium, various UV irradiation time in a range from (15–240 min) were investigated in the presence and absence of H₂O₂, for the removal of carbaryl (CBL) from an aqueous medium. The Gas-Chromatography coupled with mass spectrometry (GC-MS) and ion chromatography (IC) were applied to define the by-products and ionic species. The chemical properties such as total acidity, dissolved oxygen, and pH values were evaluated before and after irradiation in the presence and absence of H₂O₂. It was found that UV/H₂O₂ method has higher efficiency on the removal of carbaryl than UV irradiation alone. The complete mineralisation of CBL takes place at irradiation time 75 min using UV/H₂O₂. Decomposition pathway modelling for carbaryl was suggested based on the results obtained.

KEYWORDS:

• Carbaryl
• degradation
• UV//H₂O₂
• advanced oxidation process
• GC-MS

Acknowledgments

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. The experiments were performed and the facilities were used in Radiation Chemistry Laboratory at Hacettepe University, Ankara, Turkey. The corresponding author would like to thank Sudan Atomic Energy Commission, which allowed him to do this work at Hacettepe University.

Disclosure statement

No potential conflict of interest was reported by the author(s).