کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6454339 | 1418815 | 2017 | 13 صفحه PDF | دانلود رایگان |
- Catalytic behaviors of Oxone-MnOx/silica towards ibuprofen (IBU) were revealed.
- System effects on IBU removal by Oxone-MnOx/SBA-15(O-MS) were shown.
- Reaction kinetics on IBU removal by Oxone-MnOx/silica was analyzed.
- Reaction mechanisms for IBU degradation by O-MS system were identified.
Heterogeneous processes activated persulfate for organic degradation is increasingly recognized as an environmentally important remediation technology. However, manipulating persulfate oxidation processes with desirable decontamination effectiveness is still underdeveloped. Towards this goal, we systematically investigated the catalytic behaviors of Oxone-MnOx/silica systems towards aqueous ibuprofen (IBU) degradation in terms of system effects, reaction kinetics and mechanisms. MnOx/SBA-15 (MS) demonstrated variable catalytic Oxone efficacies towards IBU removal at different solution pHs. Meanwhile, the catalyst supports and FeOx co-doping within MS also produced significant impacts on catalytic Oxone efficacy. Moreover, the catalytic Oxone efficacies of MS for IBU degradation were generally inhibited by humic acid, NO3â, HCO3â, SO42â and PO43â to different extents at low/high levels. Interestingly, Clâ at low concentrations (2Â mM) obviously inhibited IBU removal by Oxone-MS, while Clâ at high concentrations (20Â mM) greatly enhanced IBU removal. Kinetic studies implied that IBU removal by Oxone-MnOx/silica systems using two first-order kinetic models was closely related to the extents of the interferences of synthetic conditions and water chemistry components. The surface electron transfer between MnOx(OH)y species of MS and HSO5â of Oxone was responsible for the formation of reactive oxygen radicals, thus contributing to IBU degradation. Liquid chromatography-mass spectrometry was employed to identify oxidation products of IBU, and reaction pathways of IBU oxidation were accordingly proposed.
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Journal: Applied Catalysis B: Environmental - Volume 205, 15 May 2017, Pages 327-339