Institute of Safety Engineering, Hubei Huanggang Polytechnic of Emergency Management, Huanggang, People's Republic of China
Email: 1107250160@qq.com (J.N.M.); 1769394061@qq.com (Z.H.Y.); 1436297004@qq.com (X.Y.Y.); 15507288705@163.com (J.H.Y.); 3317572004@qq.com (Y.H.)
*Corresponding author
Manuscript received October 20, 2024; accepted December 7, 2024; published May 30, 2025.
Abstract—Methyl Orange (MO), as a kind of azo dye, is potentially harmful to water environment. Fe is the most common transition metal. In this paper, four different forms of Fe element, including FeSO
4, FeCl
3, (NH4)
2Fe(SO
4)
2 and NH
4Fe(SO
4)
2, were researched for photocatalytic degradation of organic dye wastewater by activating the sulfite. The effects of the concentration of ferric salt and sodium bisulfite, and PH value on the catalytic degradation of methyl orange in different systems were compared. The results showed that the optimum concentration of reactants in the system of different forms of Fe element was different. According to the test and analysis results of the free radical/vacancy analysis technique - EPR, Fe has a narrow band gap and small electron escape work, which is easy to produce more photogenerated electrons and holes. HSO
3- and OH
- are oxidized by the photogenerated holes in the system and finally transformed into SO4
● - and OH
● , which are important active species in the dye degradation system. A new advanced oxidation method based on SO4
● - and OH
● has been developed for the treatment of organic dye wastewater.
Keywords—FeSO
4, FeCl
3, (NH
4)
2Fe(SO
4)
2, NH
4Fe(SO
4)
2, NaHSO
3, degradation, dye wastewater
Cite: Jinai Ma, Zhenhua Yu, Xiangyuan Yu, Junhao You, and Yang Hu, "Study on the Degradation of Methyl Orange in Wastewater by the Different Forms of Iron for Photocatalytic Activation of Sodium Bisulfite,"
International Journal of Engineering and Technology, vol. 17, no. 2, pp. 116-120, 2025.
Copyright © 2025 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
