A heterogeneous photocatalytic sulfate radical-based oxidation process for efficient degradation of 4-chlorophenol using TiO anchored on Fe oxides@carbon
| Autor: | Ali Akbar Babaei, Masoumeh Golshan, Babak Kakavandi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
021110 strategic
defence & security studies Reaction mechanism Environmental Engineering General Chemical Engineering Radical Advanced oxidation process 0211 other engineering and technologies Oxide 02 engineering and technology 010501 environmental sciences Heterogeneous catalysis Persulfate 01 natural sciences Catalysis chemistry.chemical_compound chemistry Photocatalysis Environmental Chemistry Safety Risk Reliability and Quality 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Process Safety and Environmental Protection. 149:35-47 |
| ISSN: | 0957-5820 |
| DOI: | 10.1016/j.psep.2020.10.028 |
| Popis: | A photocatalytic sulfate radical-based advanced oxidation process was studied to degrade 4-chlorophenol (4-CP) using persulfate (PS) catalyzing UV light and heterogeneous catalyst. In this regards, ferroferric oxide nanoparticles anchored on activated carbon (FOC) was applied as a supporter of TiO2 nanoparticles for fabricating of a recoverable photocatalyst (FOCT). Some analysis techniques including PL, UV–vis DRS, XRD, FESEM-EDS, BET, TEM and VSM were utilized to determine the optical, structural, textural and physicochemical characteristics of FOCT. The reaction mechanisms of PS activation and the generation of free radicals were described in details. Moreover, degradation intermediate products were identified and reaction pathway were proposed. It was found that photocatalytic activity and oxidation performance of pure TiO2 were improved after decoration on FOC. An excellent elimination efficiency was achieved in coupling of FOCT and UV irradiation with PS. Over 99 % of 4-CP (60 mg/L) and 49 % of TOC were removed by FOCT/UV/PS at optimum operational conditions. Furthermore, high PCP decontamination rate (> 86 %) was obtained, even at high concentrations (100 mg/L). During consecutive five runs of catalyst use, the degradation rate was decreased slightly to 88 % with a negligible decline in Fe and Ti leaching, demonstrating the excellent reusability and durability of FOCT in oxidation process. SO4 – and HO radicals were detected as main reactive species that involved in the degradation of 4-CP over FOCT/UV/PS system. Thanks to good performance and easy recovery of catalyst, FOCT/UV/PS hybrid system has a great potential for environmental remediation perspectives. |
| Databáze: | OpenAIRE |
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