Effectiveness of UV/SO32− advanced reduction process for degradation and mineralization of trichlorfon pesticide in water: identification of intermediates and toxicity assessment

Jafari, Bahareh; Godini, Hamid Reza; Soltani, Reza Darvishi Cheshmeh; Seydi, Enayatollah

doi:10.1007/s11356-021-17274-z

Cited by 6 publications

(2 citation statements)

References 44 publications

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“…Among the reactive oxygen species (ROS), the hydroxyl radical ( • OH) emerges as a key intermediate for “clean oxidations” due to its high positive redox potential (2.73 V vs RHE), − its swift generation from water or oxygen, and its ability to oxidize species in aqueous solutions without leaving residues. − The generation of • OH at electrode surfaces is of particular interest due to its dynamic control and potential for incorporating renewable electrical energy for producing it in environmental and synthetic applications. A broad variety of applications including advanced oxidation processes (AOPs) for wastewater treatment, photoelectrochemical processes, and even cancer therapies have benefited from its generation at electrodes. − Prospects exist for the large-scale applications of AOPs for removing organic pollutants from rivers and tributaries through their mineralization to CO 2 . − Despite its importance and its common involvement in proposed reaction mechanisms for electrooxidations, direct evidence of electrogenerated • OH is not often presented. The pioneering work of Comninellis and others using spin-traps , demonstrated that • OH is indeed produced at electrochemical surfaces such as boron-doped diamond (BDD).…”

Section: Introductionmentioning

confidence: 99%

“… 8 − 18 Prospects exist for the large-scale applications of AOPs for removing organic pollutants from rivers and tributaries through their mineralization to CO 2 . 19 − 22 Despite its importance and its common involvement in proposed reaction mechanisms for electrooxidations, direct evidence of electrogenerated • OH is not often presented. The pioneering work of Comninellis and others using spin-traps 23 , 24 demonstrated that • OH is indeed produced at electrochemical surfaces such as boron-doped diamond (BDD).…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Detection of Hydroxyl Radical Generated at Operating Electrodes via Redox-Active Adduct Formation Using Scanning Electrochemical Microscopy

et al. 2022

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The hydroxyl radical (•OH) is one of the most attractive reactive oxygen species due to its high oxidation power and its clean (photo)(electro)generation from water, leaving no residues and creating new prospects for efficient wastewater treatment and electrosynthesis. Unfortunately, in situ detection of •OH is challenging due to its short lifetime (few ns). Using lifetime-extending spin traps, such as 5,5-dimethyl-1-pyrroline N-oxide (DMPO) to generate the [DMPO–OH]• adduct in combination with electron spin resonance (ESR), allows unambiguous determination of its presence in solution. However, this method is cumbersome and lacks the necessary sensitivity and versatility to explore and quantify •OH generation dynamics at electrode surfaces in real time. Here, we identify that [DMPO–OH]• is redox-active with E 0 = 0.85 V vs Ag|AgCl and can be conveniently detected on Au and C ultramicroelectrodes. Using scanning electrochemical microscopy (SECM), a four-electrode technique capable of collecting the freshly generated [DMPO–OH]• from near the electrode surface, we detected its generation in real time from operating electrodes. We also generated images of [DMPO–OH]• production and estimated and compared its generation efficiency at various electrodes (boron-doped diamond, tin oxide, titanium foil, glassy carbon, platinum, and lead oxide). Density functional calculations, ESR measurements, and bulk calibration using the Fenton reaction helped us unambiguously identify [DMPO–OH]• as the source of redox activity. We hope these findings will encourage the rapid, inexpensive, and quantitative detection of •OH for conducting informed explorations of its role in mediated oxidation processes at electrode surfaces for energy, environmental, and synthetic applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Real-Time Detection of Hydroxyl Radical Generated at Operating Electrodes via Redox-Active Adduct Formation Using Scanning Electrochemical Microscopy

et al. 2022

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Advanced oxidation/reduction processes (AO/RPs) for wastewater treatment, current challenges, and future perspectives: a review

Khan,

Sayed,

Khan

et al. 2023

Environ Sci Pollut Res

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Roles and mechanisms of carbonaceous materials in advanced oxidation coupling processes for degradation organic pollutants in wastewater: a review

Zou,

Wang,

Gao

et al. 2023

Biochar

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The widespread organic pollutants in wastewater are one of the global environmental problems. Advanced oxidation processes (AOPs) are widely used because of their characteristics of high efficiency and strong oxidation. However, AOPs may have some defects, such as incomplete mineralization of organic pollutants and the generation of toxic by-products during the degradation process, thus it is essential to seek efficient and green wastewater treatment technologies. Coupling different AOPs or other processes is beneficial for the mineralization of pollutants and reduces ecological risks to the environment. It is worth noting that carbonaceous materials (CMs) have received widespread attention and application in the degradation of organic pollutants in water by advanced oxidation coupling processes (C-AOPs) due to their excellent physicochemical properties in recent years. However, the behaviors and mechanisms of C-AOPs based on CMs on the degradation of organic pollutants are still unknown. Therefore, it is essential to comprehensively summarize the recent research progress. In this review, the applications of different CMs in C-AOPs were reviewed first. Secondly, the synergistic mechanisms of the C-AOPs based on different CMs were discussed. Then, toxic intermediates were explored and important toxicity assessment methods were proposed. Finally, the application potential of the C-AOPs in the future and the challenges were proposed. This review provides an important reference for the application and optimization of the C-AOPs in organic wastewater treatment in the future. Graphical Abstract

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Effectiveness of UV/SO32− advanced reduction process for degradation and mineralization of trichlorfon pesticide in water: identification of intermediates and toxicity assessment

Cited by 6 publications

References 44 publications

Real-Time Detection of Hydroxyl Radical Generated at Operating Electrodes via Redox-Active Adduct Formation Using Scanning Electrochemical Microscopy

Real-Time Detection of Hydroxyl Radical Generated at Operating Electrodes via Redox-Active Adduct Formation Using Scanning Electrochemical Microscopy

Advanced oxidation/reduction processes (AO/RPs) for wastewater treatment, current challenges, and future perspectives: a review

Roles and mechanisms of carbonaceous materials in advanced oxidation coupling processes for degradation organic pollutants in wastewater: a review

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