Process optimization and mechanism study of acid red G degradation by electro-FentonFeox process as an in situ generation of H2O2

Authors

HAILONG SUN
YINGWU YAO
FENG WEI
QIANG ZHAO
BAICHEN LIU
LIMAN ZHANG

DOI

10.3906/kim-2002-10

Abstract

Dye-contaminated wastewaters are industrial wastewaters that are difficult to treat using traditional biochemical and physicochemical methods. In the present work, the acid red G was removed as a model pollutant by the electro-Fenton process for the first time. The anode and cathode used by the electro-Fenton process were iron plate and graphite felt, respectively. It was concluded that under the optimal conditions of current density = 20 mA cm-2, pH = 3 and initial Na2SO4 concentration = 0.2 M, the removal rate of acid red G (ARG) with an initial concentration of 300 mg L-1 could reach 94.05% after 80 min of electrolysis. This reveals that the electro- Fenton-Feox process used in this work has an excellent removal efficiency on acid red G. The required reagents (Fe2+ and H2O2) were generated by the electrode reaction, while the optimal generation conditions and mechanism of •OH, H2O2, and Fe2+ were investigated. By testing •OH, H2O2, and Fe2+ agents at different pH and current densities, it was revealed that the electro-Fenton reaction was most efficient when the current density was 20 mA cm-2, and the pH was 3. Moreover, the removal rate of ARG is consistent with first-order reaction kinetics.

Keywords

Electro-Fenton, dyeing wastewater, acid red G, kinetics

First Page

5

Last Page

16

Recommended Citation

SUN, HAILONG; YAO, YINGWU; WEI, FENG; ZHAO, QIANG; LIU, BAICHEN; and ZHANG, LIMAN (2021) "Process optimization and mechanism study of acid red G degradation by electro-FentonFeox process as an in situ generation of H2O2," Turkish Journal of Chemistry: Vol. 45: No. 1, Article 2. https://doi.org/10.3906/kim-2002-10
Available at: https://journals.tubitak.gov.tr/chem/vol45/iss1/2