Journal
CHEMICAL ENGINEERING JOURNAL
Volume 464, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.142450
Keywords
Ferrocene; Resin; Fenton-like reaction; High salinity wastewater; Wide pH window
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In this study, a ferrocene-containing resin was used as a heterogeneous catalyst for a Fenton-like reaction to treat different organic pollutants in high salinity wastewater. The reaction achieved high degradation ratios in a wide range of pH values and the catalyst could be easily recovered and reused. Additionally, the Fenton-like reaction efficiently regenerated the resin without the use of acid, base, or organic solvents.
As a classical advanced oxidation technology, the Fenton reaction is often criticized for having a narrow pH window, difficult recovery of catalysts, and generating iron-containing sludge. Furthermore, traditional Fenton reaction was also limited in treating high salinity wastewater. In this work, a ferrocene-containing resin is prepared and used as the heterogeneous catalyst for a Fenton-like reaction to treat different organic pollutants wastewaters in high salinity conditions under a wide pH range. Using ascorbic acid as a reducing agent, the Fenton-like reaction can degrade different organic pollutants such as methylene blue, bisphenol A, bisphenol S, tetracyclines, and 4-nitrophenol within 10 min in high salinity conditions (500 mmol/L) at a wide range of pH values from acidic to basic. In mechanism investigation, singlet oxygen and superoxide radicals were identified as the primary reactive oxygen species. It was straightforward to recover the resin from water, and the degradation ratio exceeded 99% in five consecutive experiments. Such a Fenton-like reaction could also efficiently regenerate the resins to restore their adsorption capacity without using acid, base, or organic solvents.
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