Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 392, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122315
Keywords
MIL-53(Fe); Advanced oxidation processes; Photocatalyst; Sulfate radical; Degradation pathway
Categories
Funding
- Sichuan Science and Technology Program [2019YFS0495]
- National Natural Science Foundation of China [21975057]
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This work demonstrates a facile route to assemble MIL-53(Fe) by solvothermal method. Sulfate radical-based advanced oxidation processes (SR-AOPs) coupling with photocatalysis based on MIL-53(Fe) were investigated under visible light. The catalytic effect of MIL-53(Fe) for the degradation of tetracycline hydrochloride (TC-HCl) was systematically studied, as well as the reusability of the catalyst and the effect of operating parameters. The results indicated that 99.7 % of TC (300 mg/L) could be degraded within 80 min in the SR-AOPs coupling with photocatalysis processes, as compared to 71.4 % for the SR-AOPs and only 17.1 % for the photocatalysis. The trapping experiments and electron spin-resonance spectroscopy (ESR) showed the photogenerated electrons of MIL-53(Fe) under visible light irritation were trapped by persulfate to generated sulfate radicals which effectively suppressed the recombination of photogenerated carriers. And also, the SO4-center dot could be formed by the conversion between Fe (III) and Fe (II) in MIL-53(Fe). Moreover, (OH)-O-center dot and O-center dot(2)- generated by the reaction increased significantly due to the increase of SO4-center dot which generated more 'OH and reduced photogenerated carrier recombination respectively. Thus, the degradation efficiency of TC-HCl was improved. Furthermore, the degradation pathway for TC-HCl was proposed using the theoretical calculations and liquid chromatography coupled with mass spectrometry.
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