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Effects of water matrices on the degradation of naproxen by reactive radicals in the UV/peracetic acid process
Abstract
The UV/peracetic acid (UV/PAA) process as a novel advanced oxidation process has been reported to produce carbon-centered radicals (RC•) for Naproxen (NAP) degradation, which is a representative of naphthyl structure substances. Real water matrices, such as carbonate and bicarbonate ions (CO32-/HCO3-), humic acid (HA), and chloride ion (Cl-), may react with these reactive radicals and change their contributions to NAP degradation. The results showed that RC• contributed 60.8% and •OH contributed 39.2% to NAP degradation in pure water by a competition method. CO32-/HCO3- (0-20 mM) showed minimal effect on NAP degradation in the UV/PAA process, meanwhile, it has observable inhibition effect on NAP degradation in the UV/H2O2 process (mainly of •OH) and minimal effect in the UV/PAA process with tert-butanol (TBA) (mainly of RC•). Results suggested that CO32-/HCO3- could react with •OH yielding CO3•- with low reactivity to NAP, CO3•- could further react with PAA to produce RC•. This speculation was confirmed by the increased contribution of RC• to NAP degradation with the increase of CO32-/HCO3- concentration through the competition method. HA (0-5 mg/L) had a higher scavenging capacity for RC• than •OH because HA with naphthyl structure was likely to be attacked by RC•. Cl- (0-200 mM) had little effect on NAP degradation in the UV/PAA and UV/H2O2 processes, while exerted an observable inhibition on NAP degradation in the UV/PAA process with TBA. This finding suggested that Cl- could react with RC• to produce Cl•, which could further convert into HOCl•-, and then excess •OH was formed. The new knowledge on the conversion of reactive radicals obtained in this study provides an important basis for facilitating further research on the UV/PAA advanced oxidation.
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Buxton, G. V., Greenstock, C. L., Helman, W. P., & Ross, A. B. (1988) · Journal of Physical and Chemical Reference Data · doi:10.1063/1.555805 · Cited by 12,332
Cited by
Cobalt/Peracetic Acid: Advanced Oxidation of Aromatic Organic Compounds by Acetylperoxyl Radicals
Kim, J., Du, P., Liu, W., Luo, C., Zhao, H., & Huang, C.-H. (2020) · Environmental Science & Technology · doi:10.1021/acs.est.0c00356 · Cited by 452
Accurate Removal of Toxic Organic Pollutants from Complex Water Matrices
Cai, J., Niu, B., Xie, Q., Lu, N., Huang, S., Zhao, G., & Zhao, J. (2022) · Environmental Science & Technology · doi:10.1021/acs.est.1c07824 · Cited by 189
Metadata
- Authors
- Chen, S., Cai, M., Liu, Y., Zhang, L., & Feng, L.
- Venue
- Water Research
- Publisher
- Elsevier BV
- Published
- 2019-03
- Volume
- 150
- Pages
- 153-161
- ISSN
- 0043-1354 (ISSN-L)
- OpenAlex
- W2901708805
- Cited by
- 406
- References
- 1
- FWCI
- 6.26
- Type
- journal article
- Language
- en
- Open access
- closed
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- Chen, S., Cai, M., Liu, Y., Zhang, L., & Feng, L. (2019). Effects of water matrices on the degradation of naproxen by reactive radicals in the UV/peracetic acid process. Water Research. https://doi.org/10.1016/j.watres.2018.11.044
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