pH Dependence of Hydroxyl Radical, Ferryl, and/or Ferric Peroxo Species Generation in the Heterogeneous Fenton Process

Background: Coal gangue was used as a catalyst in heterogeneous Fenton process for the degradation of azo dye and phenol. The influencing factors, such as solution pH gangue concentration and hydrogen peroxide dosage were investigated, and the reaction mechanism between coal gangue and hydrogen peroxide was also discussed. Methods: Experimental results showed that coal gangue has the ability to activate hydrogen peroxide to degrade environmental pollutants in aqueous solution. Under optimal conditions, after 60 minutes of treatment, more than 90.57% of reactive red dye was removed, and the removal efficiency of Chemical Oxygen Demand (COD) up to 72.83%. Results: Both hydroxyl radical and superoxide radical anion participated in the degradation of organic pollutant but hydroxyl radical predominated. Stability tests for coal gangue were also carried out via the continuous degradation experiment and ion leakage analysis. After five times continuous degradation, dye removal rate decreased slightly and the leached Fe was still at very low level (2.24-3.02 mg L-1). The results of Scanning Electron Microscope (SEM), energy dispersive X-Ray Spectrometer (EDS) and X-Ray Powder Diffraction (XRD) indicated that coal gangue catalyst is stable after five times continuous reuse. Conclusion: The progress in this research suggested that coal gangue is a potential nature catalyst for the efficient degradation of organic pollutant in water and wastewater via the Fenton reaction.

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Remediation of ammonia-stripped sanitary landfill leachate by integrated heterogeneous Fenton process and aerobic biological methods

International Journal of Environmental & Analytical Chemistry ◽

10.1080/03067319.2021.1969381 ◽

2021 ◽

pp. 1-14

Author(s):

Gamal K. Hassan ◽

Tarek A. Gad-Allah ◽

Mohamed I. Badawy ◽

Fatma A. El-Gohary

Keyword(s):

Landfill Leachate ◽

Sanitary Landfill ◽

Fenton Process ◽

Heterogeneous Fenton ◽

Biological Methods ◽

Sanitary Landfill Leachate

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Real-time detection of hydrogen peroxide using microelectrodes in an ultrasonic enhanced heterogeneous Fenton process catalyzed by ferrocene

Environmental Science and Pollution Research ◽

10.1007/s11356-015-4774-2 ◽

2015 ◽

Vol 22 (14) ◽

pp. 11170-11174 ◽

Cited By ~ 4

Author(s):

Jun Lin ◽

Qing Xin ◽

Xiumin Gao

Keyword(s):

Hydrogen Peroxide ◽

Real Time ◽

Fenton Process ◽

Heterogeneous Fenton ◽

Real Time Detection

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The use of steel slags in the heterogeneous Fenton process for decreasing the chemical oxygen demand of oil refinery wastewater

Water Science & Technology ◽

10.2166/wst.2018.347 ◽

2018 ◽

Vol 78 (5) ◽

pp. 1159-1167 ◽

Cited By ~ 1

Author(s):

Behnam Heidari ◽

Mohsen Soleimani ◽

Nourollah Mirghaffari

Keyword(s):

Microwave Irradiation ◽

Chemical Oxygen Demand ◽

Steel Slag ◽

Oxygen Demand ◽

Oil Refinery ◽

Fenton Process ◽

Refinery Wastewater ◽

Optimum Conditions ◽

Heterogeneous Fenton ◽

Oil Refinery Wastewater

Abstract The Fenton process is a useful and inexpensive type of advanced oxidation process for industrial wastewater treatment. This study was performed with the aim of using the steel slag as a catalyst in the heterogeneous Fenton process in order to reduce the chemical oxygen demand (COD) of oil refinery wastewater. The effects of various parameters including the reaction time (0.5, 1.0, 2.0, 3.0 and 4.0 h), pH (2.0, 3.0, 4.0, 5.0, 6.0 and 7.0), the concentration of steel slag (12.5, 25.0 and 37.5 g/L), and H2O2 concentration (100, 250, 400 and 500 mg/L) on the Fenton process were investigated. Furthermore, the effect of microwave irradiation on the process efficiency was studied by considering the optimum conditions of the mentioned parameters. The results showed that using 25.0 g/L of steel slag and 250 mg/L H2O2, at pH = 3.0, could reduce COD by up to 64% after 2.0 h. Also, microwave irradiation decreased the time of the process from 120 min to 25 min in the optimum conditions, but it consumed a high amount of energy. It could be concluded that steel slags had a high potential in the treatment of oil refinery wastewater through the Fenton process.

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