Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 368, Issue -, Pages 234-242Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2019.01.042
Keywords
NO removal; AOP method; Hydroxyl radical; Oxychloride radical; Kinetics
Categories
Funding
- Natural Science Foundation of China [51708213]
- Natural Science Foundation of Hebei [E2018502058]
- National Key Research and Development Plan [2016YFC0203705, 2017YFC0210600]
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The key step for nitric oxide (NO) removal using oxidation method is to efficiently oxidize NO. This study developed a novel advanced oxidation process (AOP) of ultraviolet light (UV) catalysis of chlorite (NaC102) to oxidize NO. The production of nitric dioxide (NO2) and photo-production of chlorine dioxide (C102) were suppressed by adding ammonium hydroxide (NH4OH). The NO conversion efficiency was 98.1% using UV/ NaClO2-NH4OH. Electron spin resonance (ESR) tests confirmed the roles of hydroxyl radical (HO') and oxychloride radical (ClO2/Cl2O2) in the oxidation of NO. Kinetics analyses showed that NO flux was significantly enhanced by radical-induced (HO-/ClO) oxidation of NO. In the presence of UV, the overall reaction rates (k,,1*) were 3-8 times higher than those without UV. The Hatta number, namely the enhanced factor, was calculated in the range of 229-403 and 730-780 corresponding to without and with UV light, suggesting that NO oxidation belonged to fast and/or instantaneous reaction. Thus, the gas-film mass transfer resistance was the rate-determining step. N-containing product was determined as NH4+ and NO3- according to X-ray photoelectron spectroscopy ()CPS).
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