A highly efficient advanced oxidation process for the degradation of benzoic acid (BA) during activation of peroxomonosulfate (PMS) by nanoscale zero-valent copper (nZVC) in acidic solution is reported. BA degradation was almost completely achieved after 10 min in the nZVC/PMS process at initial pH 3.0. PMS could accelerate the corrosion of nZVC in acidic to release Cu+ which can further activate PMS to produce reactive radicals. Both sulfate radical (SO4−•) and hydroxyl radical (•OH) were considered as the primary reactive oxidant in the nZVC/PMS process with the experiments of methyl (MA) and tert-butyl alcohol quenching. Acidic condition (initial pH ≤ 3.0) facilitated BA degradation and pH is a decisive factor to affect the oxidation capacity in the nZVC/PMS process. Moreover, BA degradation in the nZVC/PMS process followed the pseudo-first-order kinetics, and BA degradation efficiency increased with the increase of the nZVC dosage.
Radicals induced from peroxomonosulfate by nanoscale zero-valent copper in the acidic solution
Peng Zhou, Bei Liu, Jing Zhang, Yongli Zhang, Gucheng Zhang, Chenmo Wei, Juan Liang, Ya Liu, Wei Zhang; Radicals induced from peroxomonosulfate by nanoscale zero-valent copper in the acidic solution. Water Sci Technol 28 October 2016; 74 (8): 1946–1952. doi: https://doi.org/10.2166/wst.2016.381
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