Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 250, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.117269
Keywords
Advanced oxidation processes; Imidacloprid; Inorganic ions; Natural organic matter; Reactive oxygen species
Categories
Funding
- Ministry of Science and Technology, Taiwan
- MOST [106-2221-E-022-002-MY3, 106-2221-E-022003-MY3]
- Department of Science and Technology, Philippines
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Pesticides are vital and indispensable especially in agricultural production. However, pesticide contamination is also a serious threat to human health and the environment. Imidacloprid (IMD), an archetypal neonicotinoid insecticide, is commonly used to protect a variety of crops worldwide. This study examined the destruction of IMD contaminant in wastewater via catalytic oxidation with sodium percarbonate (SPC). The process exemplified 100% removal at optimum condition. Rates of reaction were expressed in terms of the apparent rate constants (k(app)) and were observed to satisfactorily follow pseudo-first-order kinetics. Inhibitory effects of humic acid and various coexisting ions on IMD degradation were examined and the trend was observed as follows: NO2- > PO43- > NH4+ > Cl- > NO3-.In- addition, we elucidated the participation of center dot OH (hydroxyl), center dot O-2(-) (superoxyl), and HO2 center dot (perhydroxyl) radicals in the process by performing scavenging experiments for these reactive oxygen species. A likely IMD degradation pathway was proposed based on the intermediate species identified via gas chromatography/mass spectroscopy electron ionization procedure. Overall, the present study established SPC as a cleaner alternative to other oxidants for pesticide degradation as it is non-toxic, safe to handle, and produces by-products that inherently exist in the natural water matrix.
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