Efficiency and mechanism of diclofenac degradation by sulfite/UV advanced reduction processes (ARPs)

Yu, Xingyue; Cabooter, Deirdre; Dewil, Raf

doi:10.1016/j.scitotenv.2019.06.210

Cited by 78 publications

(9 citation statements)

References 43 publications

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“…The limitation of the experimental conditions used for the mercury vapor lamp and the solar simulator is that the UV wavelengths of >280 nm are used but sulfite excitation is maximal at 254 nm. 73 The slight increase in rate for the sulfite experiments may be due to the small amount of e aq – generated at wavelengths above 280 nm. The filter choice was made because photolysis at 254 nm leads to rapid direct photolysis and the effect of advanced reduction to observe transformation products is not viable.…”

Section: Resultsmentioning

confidence: 99%

“…For ARP sulfite, the rate constant was always slightly greater than that at pH 10 with the exception of fluroxypyr in the solar simulator. The limitation of the experimental conditions used for the mercury vapor lamp and the solar simulator is that the UV wavelengths of >280 nm are used but sulfite excitation is maximal at 254 nm . The slight increase in rate for the sulfite experiments may be due to the small amount of e aq – generated at wavelengths above 280 nm.…”

Section: Resultsmentioning

confidence: 99%

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Finding Fluorine: Photoproduct Formation during the Photolysis of Fluorinated Pesticides

Bhat

Pomerantz

Arnold

2022

Environ. Sci. Technol.

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The photolysis of pesticides with different fluorine motifs was evaluated to quantify the formation of fluorinated products in buffered aqueous systems, advanced oxidation (AOP) and reduction processes (ARP), and river water. Simulated sunlight quantum yields at pH 7 were 0.0033, 0.0025, 0.0015, and 0.00012 for penoxsulam, florasulam, sulfoxaflor, and fluroxypyr, respectively. The bimolecular rate constants with hydroxyl radicals were 2 to 5.7 × 10 10 M −1 s −1 and, with sulfate radicals, 1.6 to 2.6 × 10 8 M −1 s −1 for penoxsulam, florasulam, and fluroxypyr, respectively. The rate constants of sulfoxaflor were 100fold lower. Using quantitative 19 F-NMR, complete fluorine mass balances were obtained. The maximum fluoride formation was 53.4 and 87.4% for penoxsulam and florasulam under ARP conditions, and 6.1 and 100% for sulfoxaflor and fluroxypyr under AOP conditions. Heteroaromatic CF 3 and aliphatic CF 2 groups were retained in multiple fluorinated photoproducts. Aryl F and heteroaromatic F groups were readily defluorinated to fluoride. CF 3 and CF 2 groups formed trifluoroacetate and difluoroacetate, and yields increased under oxidizing conditions. 19 F-NMR chemical shifts and coupling analysis provided information on hydrogen loss on adjacent bonds or changes in chirality. Mass spectrometry results were consistent with the observed 19 F-NMR products. These results will assist in selecting treatment processes for specific fluorine motifs and in the design of agrochemicals to reduce byproduct formation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Finding Fluorine: Photoproduct Formation during the Photolysis of Fluorinated Pesticides

Bhat

Pomerantz

Arnold

2022

Environ. Sci. Technol.

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“…Concerning the compounds with chlorine, e.g., DCF, the generation of chloride ions can be monitored by using ion chromatography (IC). The dichlorination efficiency in the degradation processes can be estimated through chlorine mass balance calculation Nieto-Sandoval et al, 2018;Yu et al, 2019). For the degradation systems with known parent compounds, the total chloride (TCl) can be calculated by summing the concentration of free chloride ions (CCl -) and chlorine bonds of parent compounds (e.g., two chlorine bonds for DCF;…”

Section: Formation Of By-productsmentioning

confidence: 99%

Performance indicators for a holistic evaluation of catalyst-based degradation—A case study of selected pharmaceuticals and personal care products (PPCPs)

Wan

Tsang

et al. 2021

Journal of Hazardous Materials

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“…Today, a new technology called advanced reduction processes (ARPs) has been developed alongside advanced oxidation processes )AOPs) 16 , 17 . ARPs have proven to be very successful in degrading various pollutants such as acid yellow 17 dye 18 ,vinyl chloride 19 , bromate 20 , perchlorate 21 , diclofenac 22 , 1,2-dichloroethane 23 , pyridine 24 , 2, 4, 6-trichlorophenol 25 and hexavalent chromium 23 . ARPs, with a combination of activation methods and reducing agents, lead to the production of highly reactive free radicals that can decompose pollutants 16 , 26 .…”

Section: Introductionmentioning

confidence: 99%

Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

Vahidi-Kolur,

Yazdanbakhsh,

Hosseini

et al. 2024

Sci Rep

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Due to its widespread use in agriculture, atrazine has entered aquatic environments and thus poses potential risks to public health. Therefore, researchers have done many studies to remove it. Advanced reduction process (ARP) is an emerging technology for degrading organic contaminants from aqueous solutions. This study was aimed at evaluating the degradation of atrazine via sulfite/iodide/UV process. The best performance (96% of atrazine degradation) was observed in the neutral pH at 60 min of reaction time, with atrazine concentration of 10 mg/L and concentration of sulfite and iodide of 1 mM. The kinetic study revealed that the removal of atrazine was matched with the pseudo-first-order model. Results have shown that reduction induced by $${{\text{e}}}_{{\text{aq}}}^{-}$$ e aq - and direct photolysis dominated the degradation of atrazine. The presence of anions ($${{\text{Cl}}}^{-}$$ Cl - ,$${{\text{CO}}}_{3}^{2-}$$ CO 3 2 - and $${{\text{SO}}}_{4}^{2-}$$ SO 4 2 - ) did not have a significant effect on the degradation efficiency. In optimal conditions, COD and TOC removal efficiency were obtained at 32% and 4%, respectively. Atrazine degradation intermediates were generated by de-chlorination, hydroxylation, de-alkylation, and oxidation reactions. Overall, this research illustrated that Sulfite/iodide/UV process could be a promising approach for atrazine removal and similar contaminants from aqueous solutions.

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Efficiency and mechanism of diclofenac degradation by sulfite/UV advanced reduction processes (ARPs)

Cited by 78 publications

References 43 publications

Finding Fluorine: Photoproduct Formation during the Photolysis of Fluorinated Pesticides

Finding Fluorine: Photoproduct Formation during the Photolysis of Fluorinated Pesticides

Performance indicators for a holistic evaluation of catalyst-based degradation—A case study of selected pharmaceuticals and personal care products (PPCPs)

Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

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