Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 386, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2019.112072
Keywords
Iron oxychloride; Hydrogen peroxide; Oxidant utilization; Fe(III)/Fe(II) cycle; Photo-Fenton; Formation rate of center dot OH
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Funding
- Wuhan International Science and Technology Cooperation Program [2018ZYYD025]
- Natural Science Foundation of Hubei [2017030209020255]
- [2018CFB682]
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FeOCl was prepared by a partial thermal decomposition method to effectively catalyze hydrogen peroxide under the visible light for the degradation of toxic organic wastewater. The combination of DRS and VB-XPS indicated that FeOCl is a narrow band gap catalyst with visible light absorption capacity (Eg = 1.63 eV). The degradation rate constant of RhB in FeOCl/H2O2/Vis system is about 13.4 times that of FeOCl/H2O2 system. Compared to other heterogeneous Photo-Fenton systems, the oxidant utilization efficiency in FeOCl/H2O2/Vis system is higher. In addition, FeOCl has stable Photo-Fenton activity in a wide pH range (3.0-9.0). The content of Fe(II) increased after 5 cycles reaction through the ESR and XPS characterization, which proves that the electron transfer of Fe(III)/Fe(II) was improved during the reaction. After quantitative analysis of the center dot OH generated in the reaction, the formation rate of center dot OH in FeOCl/H2O2/Vis system is increased about 30% compared with FeOCl/H2O2/dark system. These results indicate that visible light excites FeOCl to generate produces photogenerated electron-hole pairs, accelerating the cycle of Fe(III)/Fe(II), promoting the production rate of OH, and enhancing the catalytic efficiency of FeOCl.
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