Rapid degradation of tetracycline hydrochloride by heterogeneous photocatalysis coupling persulfate oxidation with MIL-53(Fe) under visible light irradiation
| Autor: | Xiaoqiong Feng, Weiquan Cai, Junhui Chen, Jiabin Zhou, Ying Zhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Light Health Toxicology and Mutagenesis Iron 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences Photochemistry 01 natural sciences Catalysis law.invention Tetracycline Hydrochloride Magazine law Environmental Chemistry Spectroscopy Waste Management and Disposal Metal-Organic Frameworks 0105 earth and related environmental sciences 021110 strategic defence & security studies Chemistry Sulfates Tetracycline Persulfate Photochemical Processes Pollution Sodium Compounds Anti-Bacterial Agents Photocatalysis Degradation (geology) Oxidation-Reduction Water Pollutants Chemical Visible spectrum |
| Zdroj: | Journal of hazardous materials. 392 |
| ISSN: | 1873-3336 |
| Popis: | 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− could be formed by the conversion between Fe (Ⅲ) and Fe (Ⅱ) in MIL-53(Fe). Moreover, OH and O2− generated by the reaction increased significantly due to the increase of SO4− 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. |
| Databáze: | OpenAIRE |
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