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• W2967245772 endingPage "25422" @default.
• W2967245772 startingPage "25414" @default.
• W2967245772 abstract "A significant amount of biorefractory organic wastewater is generated during the production of dinitrodiazophenol (DDNP). In this study, ultraviolet light (254 nm) that was coupled with the Fenton (UV-Fenton) process was applied to treat refractory organics in DDNP industrial wastewater. The effects of key parameters (i.e., H2O2 dose, Fe2+ dosage, and initial pH) on the treatment efficacy for DDNP industrial wastewater by the UV-Fenton process was investigated systematically. Alcohol quenching experiments were carried out to identify reactive oxygen species in the UV-Fenton process. The treatment efficacy and degradation characteristics of refractory organics were studied and compared by using control experiments. Increasing H2O2 and Fe2+ doses could lead to improved treatment results to a different extent. A more intense reaction and better treatment results were achieved by using the UV-Fenton process at lower pH conditions. Under optimal conditions of H2O2 dose = 7.5 mL L-1, Fe2+ dosage = 0.05 mM, and initial pH = 5.0, the pseudo-first order constants k for chemical oxygen demand removal and color number removal were 0.18 min-1 and 1.24 min-1, and the chemical oxygen demand and color number removal efficiencies were 74.24% and 99.94%, respectively. The treatment results for the UV-Fenton process were better than other processes under the same conditions, and a significant synergetic effect was observed for the UV-Fenton process. Alcohol quenching experiments indicated that the predominant reactive oxygen species in the UV-Fenton process was the hydroxyl radical (·OH). Because more ·OH was produced, the UV-Fenton process exhibited a much better treatment performance in degrading and destroying organic structures (i.e., benzene rings, -NO2, and -N[double bond, length as m-dash]N-). Furthermore, the biodegradability indicated by the biological oxygen demand/chemical oxygen demand ratio was improved considerably to 0.48 from 0.054. The good treatment performance by UV-Fenton allowed for a more efficient electrical energy consumption compared with the UV and UV-H2O2. This study provides a theoretical reference for DDNP industrial wastewater treatment by using the UV-Fenton process." @default.
• W2967245772 created "2019-08-22" @default.
• W2967245772 creator A5072803831 @default.
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• W2967245772 date "2019-01-01" @default.
• W2967245772 modified "2023-10-16" @default.
• W2967245772 title "Removal of refractory organics in dinitrodiazophenol industrial wastewater by an ultraviolet-coupled Fenton process" @default.
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• W2967245772 doi "https://doi.org/10.1039/c9ra04905c" @default.
• W2967245772 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35530051" @default.
• W2967245772 hasPublicationYear "2019" @default.
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