Enhanced Photocatalytic Degradation of the Imidazolinone Herbicide Imazapyr upon UV/Vis Irradiation in the Presence of CaMnO-TiO Hetero-Nanostructures: Degradation Pathways and Reaction Intermediates.

The determination of reaction pathways and identification of products of pollutants degradation is central to photocatalytic environmental remediation. This work focuses on the photocatalytic degradation of the herbicide Imazapyr (2-(4-methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl) pyridine-3-carboxylic acid) under UV-Vis and visible-only irradiation of aqueous suspensions of CaMnO-TiO, and on the identification of the corresponding degradation pathways and reaction intermediates. CaMnO-TiO was formed by mixing CaMnO and TiO by mechanical grinding followed by annealing at 500 °C.

Factors Influencing Imazapyr Herbicide Removal from Wastewater Using Photocatalytic Ozonation.

This study investigates the degradation of imazapyr herbicide from wastewater by photocatalytic ozonation using TiO2 as a semiconductor. Effects of operational parameters on imazapyr removal efficiency including TiO2 dosing, initial herbicide concentration and pH were also studied. Obtained results showed that more than 90% of removal efficiency representing the disappearance of imazapyr was maintained until 7 µM in the presence of 200 mgL-1of UV100-TiO2.