Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6465309 | Chemical Engineering Journal | 2017 | 10 Pages |
â¢Co-OMC catalyst possesses high specific surface area and uniform pore size.â¢Co-OMC presents higher reactivity than CoFe2O4 and Co3O4 for PMS activation.â¢The catalytic activity of Co-OMC was not affected by HCO3â and humic acid.â¢The degradation rate of phenol with initial pH 11.0 was much higher than pH â¤Â 9.â¢O2â and 1O2 rather than OH and SO4â are the main reactive oxygen species.
CoOx-doped ordered mesoporous carbon (Co-OMC) was synthesized and employed as an efficient activator of peroxymonosulfate (PMS) for the degradation of refractory pollutants. Co-OMC possessed high BET specific surface area (723Â m2/g) and uniform pore size distribution (â¼4Â nm) because of its ordered mesoporous structure. 20Â mg/L phenol could be completely degraded with the addition of 0.1Â g/L Co-OMC and 1Â mMÂ PMS in 60Â min. In addition, the catalytic activity of Co-OMC for PMS activation was much higher than some efficient catalysts such as Co3O4, CoFe2O4 and OMC. Besides, Co-OMC showed remarkable efficiency for the destruction of seven representative pollutants. Results indicated that the catalytic activity of Co-OMC increased with the calcination temperature increasing, which may be caused by the higher defect degree at higher calcination temperature. In addition, various practical parameters such as PMS concentration, initial pH, anion, nature organic matter and reaction temperature were systematically investigated using phenol as the target pollutant. The electron-spin resonance and radical quenching experiments results demonstrated that reactive oxygen species (ROS), such as SO4â, OH, O2â and 1O2, were involved in the degradation of phenol, and their generation strongly depended on the solution pH. Based on these results, a catalytic mechanism for PMS activation was proposed: O2â and 1O2 were responsible for the degradation of phenol when initial pH was 6, but the role of SO4â and OH was limited; while SO4â and OH were the major reactive species when initial pH was 11.0.
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