The photocatalytic removal of diazinon from aqueous solutions using tungsten oxide doped zinc oxide nanoparticles immobilized on glass substrate

Photocatalytic removal of 2,4-Dichlorophenoxyacetic acid from aqueous solution using tungsten oxide doped zinc oxide nanoparticles immobilised on glass beads

“…Commonly, pesticides are oxidised to CO 2 ; however, carboxylate anions such as formates, acetates or oxalates are formed and these are intermediate, which are non-toxic products [52]. In a study by Wang et al [53], similar results were reported on diazinon removal using the electro-Fenton process and also in another study on diazinon [54] using the same catalyst as in the present study.…”

Tungsten-Based Catalysts for Environmental Applications

“…Zinc oxide nanoparticles doped with 0.5% to 2% WO 3 were synthesized by hydrothermal method to obtain samples where W was added into ZnO structure [407]. Photocatalytic activity for diazinon removal was reported to reach 99% for 2% WO 3 -doped ZnO catalyst after 180 min of contact time.…”

Environmental Occurrence, Toxicity Concerns, and Degradation of Diazinon Using a Microbial System

“… Nakaoka et al (2010) reported that the removal rate of diazinon was approximately 88% after 30 h of treatment with platinized TiO 2 as the catalyst using UV irradiation. Maleki et al (2020) studied WO 3 -doped ZnO photocatalysis, in which the mineralization rate of 20 mg/L diazinon under UV irradiation reached 89%. The ozone degradation of diazinon is performed using nanometal oxides as catalysts, and it generates a variety of active free radicals, which accelerate the additional reaction of hydroxyl radicals and the oxidation of the phosphate group, which is, in turn, conducive to the removal of diazinon ( Malakootian et al, 2020 ).…”

“…In addition, Liu et al (2009) found that acid sites were provided in the structure where the catalyst existed, preventing the generation of electron–hole compounds and improving the removal efficiency of organic pollutants. At present, active photocatalysts for photocatalytic degradation of organic and inorganic pollutants are limited to certain metals and nonmetallic substances, such as titanium, tungsten oxide, zinc oxide, iron oxide, cadmium sulfide and zinc sulfide, which are gradually introduced ( Daneshvar et al, 2007 ; Sajjad et al, 2018 ; Khoiriah et al, 2020 ; Maleki et al, 2020 ). The ZnO@SiO2@Fe3O4/PMS/UV system is beneficial to the decomposition of oxidizing agents, and a variety of reactive oxidizing species (H⋅, HO⋅, O 2 ⋅ – , SO 4 ⋅ – ) are involved in the degradation of diazinon.…”

“…The ZnO@SiO2@Fe3O4/PMS/UV system is beneficial to the decomposition of oxidizing agents, and a variety of reactive oxidizing species (H⋅, HO⋅, O 2 ⋅ – , SO 4 ⋅ – ) are involved in the degradation of diazinon. H⋅ and HO⋅ species play a leading role in diazinon degradation ( Daneshvar et al, 2007 ; Rezaei et al, 2019 ; Maleki et al, 2020 ). A number of studies have reported that ozone is a strong oxidant with a redox potential of 2.07 V, which can be combined with UV, H 2 O 2 and other processes to destroy ozone and generate more HO⋅ radical oxidation of diazinon to form short-chain compounds ( Ayoubi-Feiz et al, 2019 ; El Hassani et al, 2019 ; Malakootian et al, 2020 ).…”