Enhanced solar light photocatalytic performance of Fe-ZnO in the presence of H2O2, S2O82−, and HSO5− for degradation of chlorpyrifos from agricultural wastes: Toxicities investigation. (January 2022)

• Record Type: Journal Article
• Authors: Shah, Noor S.; Iqbal, Jibran; Sayed, Murtaza; Ghfar, Ayman A.; Khan, Javed Ali; Khan, Zia Ul Haq; Murtaza, Behzad; Boczkaj, Grzegorz; Jamil, Farrukh
• Is Part Of: Chemosphere. Volume 287:Part 4(2022)
• Publication Date: 2022-01
• Subjects: Peroxides -- Chlorpyrifos -- Iron -- Ecotoxicties -- Waste treatment -- Zinc oxide; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.132331
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: This study reported Fe doped zinc oxide (Fe-ZnO) synthesis to degrade chlorpyrifos (CPY), a highly toxic organophosphate pesticide and important sources of agricultural wastes. Fourier transform infrared, X-ray diffraction, scanning electron microscope, and energy-dispersive X-ray spectroscopic analyses showed successful formation of the Fe-ZnO with highly crystalline and amorphous nature. Water collected from agricultural wastes were treated with Fe-ZnO and the results showed 67% degradation of CPY by Fe-ZnO versus 39% by ZnO at 140 min treatment time. Detail mechanism involving reactive oxygen species production from solar light activated Fe-ZnO and their role in degradation of CPY was assessed. Use of H2 O2, peroxydisulfate (S2 O8 2− ) and peroxymonosulfate (HSO5 − ) with Fe-ZnO under solar irradiation promoted removal of CPY. The peroxides yielded hydroxyl (OH) and sulfate radical ( ) under solar irradiation mediated by Fe-ZnO. Effects of several parameters including concentration of pollutant and oxidants, pH, co-existing ions, and presence of natural organic matter on CPY degradation were studied. Among peroxides, HSO5 − revealed to provide better performance. The prepared Fe-ZnO showed high reusability and greater mineralization of CPY. The GC-MS analysis showed degradation of CPY resulted into several transformation products (TPs). Toxicity analysis of CPY as well as its TPs was performed and the formation of non-toxic acetate imply greater capability of the treatment technology. Graphical abstract: Image 1 Highlights: Fe doped ZnO was successfully synthesized by sol-gel method. Fe doping and use of peroxides synergistically promoted performance of ZnO. Degradation of chlorpyrifos was inhibited by hvb + and OH scavengers. Second-order rate constants of chlorpyrifos with OH and were calculated. Toxicities of chlorpyrifos and its transformation products were estimated.