Coupling of heterogeneous advanced oxidation processes and photocatalysis in efficient degradation of tetracycline hydrochloride by Fe-based MOFs: Synergistic effect and degradation pathway
By Y. Zhang, Jiabin Zhou, Xin Chen, Luoshan Wang, Weiquan Cai. Chemical Engineering Journal, 2019
552 citations recorded by the source corpus.
Abstract In this work, a Fe-based metal organic frameworks (MIL-88A) has been synthesized through a hydrothermal method and adopted as a high-efficiency catalyst for photocatalysis (PC) coupled with sulfate radical-based advanced oxidation processes (SR-AOPs) to degrade tetracycline hydrochloride (TC-HCl) under visible light irradiation. The effects of MIL-88A/persulfate (PS) molar ratio, initial solution pH and catalyst dosage were studied. The results indicated that the combining of the photocatalysis and SR-AOPs could remarkably enhance TC degradation and 200 mg/L 100 mL TC could be degraded completely at 0.25 g/L MIL-88A, unadjusted pH value and 4 mM PS in 80 mins. The results of scavenging experiments and ESR analysis demonstrated that SO4−• and •O2– radicals were the predominant radicals for the TC degradation. The significant improvement of degradation rate in MIL-88A/PS/Vis process is attributed to the following two factors: (1) as a photocatalyst, MIL-88A could be excited by visible light, therefore photogenerated electrons (e−) on the conduction band (CB) of MIL-88A could be trapped by PS to generate SO4−• radicals. In this process, PS acted as an electron acceptor and the electron/hole recombination was suppressed leading to the enhanced photocatalyst efficiency; (2) The PS can be activated not only by photoelectrons but also Fe (III) in MIL-88A leads to the generation of SO4−• radicals more rapidly and easily. A possible mechanism and degradation pathway for TC was proposed based on the trapping/ESR experiments and liquid chromatography-mass spectrometry (LC-MS) analysis. This work proposed a new idea and method in combining two oxidation processes in degradation of organic pollutants thus could be potentially used in environmental purification.
Subfields: Inorganic Chemistry, Renewable Energy, Sustainability and the Environment, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/946b6092ff927a7fcb3824bde8cc7b0be0665b94
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In Inorganic Chemistry
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Citations in the corpus
- Photocatalysis-activated SR-AOP over PDINH/MIL-88A(Fe) composites for boosted chloroquine phosphate degradation: Performance, mechanism, pathway and DFT calculations (2021, methodology): “Among various Fe-MOFs, environment friendly MIL-88A(Fe) constructed from Fe3+ and fumaric acid was previously used to activate PDS for RhB degradation [19] and TC degradation [16].”