Reduction and Degradation of Paraoxon in Water Using Zero-Valent Iron Nanoparticles

Paraoxon is an emerging organophosphate pollutant that commonly used as a pesticide and drug, hence increasing the risk of contamination water supplies. Its intensive use for vector control has led to pollutions in soil water. very toxic, with LD50 2 30 mg/kg rats. It can be metabolized body from parathion; thus, exposure lead serious health effects. In this study, zero valent iron (Fe°/ZVI NPs) nanoparticles were synthesized investigated degradation Paraoxon, chemical warfare agent insecticide, aqueous solution. The effects solution pH, initial concentration, ZVI NPs dosage contact time on mineralization efficiency examined. Batch experiments demonstrated 15 mg L−1 was mineralized at efficiencies 75.9%, 63.9% 48.9% after three-hour treatment 6.0, 4.0 2.0% w/v Fe°, respectively. calculated kinetic rate constant kobs 0.4791 h−1, 0.4519 h−1 0.4175 treating 10, 20 6.0% Fe, dynamics described by first-order law evidenced constants independent concentration. strongly dependent decrease maximum removal pH 4. p-nitrophenol detected product, suggesting cleavage O-P bond hydrolysis possible reaction processes. This study showed Fe° particles have potential degrading Paraoxon.