Journal
WATER SCIENCE AND TECHNOLOGY
Volume 74, Issue 8, Pages 1946-1952Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2016.381
Keywords
benzoic acid; hydroxyl radical; peroxomonosulfate; sulfate radical; zero-valent copper
Funding
- National Natural Science Foundation of China [51508353, 51408349]
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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-center dot) and hydroxyl radical (center dot 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.
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