Degradation of α-nitroso-β-naphthol by UVA-B activated peroxide, persulfate and monopersulfate oxidants in water
Authorized Users Only
2019
Authors
Lu, ChaoYao, Jun
Šolević Knudsen, Tatjana

Amde, Meseret
Gu, Jihai
Liu, Jianli
Li, Hao
Zhang, Junyang
Article (Published version)

Elsevier
Metadata
Show full item recordAbstract
Flotation reagents, especially new chelating agents represented by α-nitroso-β-naphthol, are the main components of cobalt mining drainage. This study reports the degradation of α-nitroso-β-naphthol by simulated UVA-B (280–400 nm) activated systems using three common oxidants, hydrogen peroxide, sodium persulfate and potassium monopersulfate at a laboratory scale using a photoreactor. Parameters which can affect the degradation process were investigated and comparison of the degradation performance of the three systems were made. Based on the results, UVA-B/sodium persulfate system exhibited best performance towards the removal of α-nitroso-β-naphthol with a lower cost of oxidant and energy consumption compared to the others. The removal efficiency was found to increase as the oxidant dosage and the UVA-B power increases. Only potassium monopersulfate could be activated by bicarbonate and chloride ions, and SO4 2− has insignificant effect on the removal efficiency of α-nitroso-β-naphth...ol for all systems while NO3 − inhibited the degradation of α-nitroso-β-naphthol. In the UVA-B/hydrogen peroxide system, the hydroxyl radical had a leading role in the degradation of α-nitroso-β-naphthol, while in the other two systems, the degradation of α-nitroso-β-naphthol was mainly caused by the hydroxyl and sulphate radicals. Ten major intermediates from α-nitroso-β-naphthol degradation in the three oxidation systems were identified by gas chromatography and mass spectrometry. In summary, this report could be a great input in developing UVA-B activated oxidants-based treatment technologies. The UVA-B/sodium persulfate system is strongly recommended for its consideration in the treatment of mine impacted wastewaters. UVA-B/SPS is the most efficient, economical and energy-saving technique for the degradation of αNβN compared to UVA-B/HP and UVA-B/PMS systems.
Keywords:
α-Nitroso-β-naphthol / UVA-B activated oxidant / Advanced oxidation processes / Kinetics / Intermediate productsSource:
Journal of Cleaner Production, 2019, 238, 117942-Publisher:
- Elsevier
Projects:
- Grants from the National Natural Science Foundation of China (41430106, 41720104007, 41573080, 41711530030, 41711530150)
- Project of the Ministry of Science and Technology of China (S2016G2135)
- Geochemical investigations of sedimentary rocks - fossil fuels and environmental pollutants (RS-176006)
Note:
- The peer-reviewed version: http://cer.ihtm.bg.ac.rs/handle/123456789/3152
DOI: 10.1016/j.jclepro.2019.117942
ISSN: 0959-6526