Effect of the presence of inorganic ions and operational parameters on free cyanide degradation by ultraviolet C activation of persulfate in synthetic mining wastewater

dc.creatorSatizabal-Gómez, Valentina
dc.creatorCollazos-Botero, Manuel Alejandro
dc.creatorSerna-Galvis, Efraím A.
dc.creatorTorres-Palma, Ricardo A.
dc.creatorBravo-Suárez, Juan J.
dc.creatorMachuca-Martínez, Fiderman
dc.creatorCastilla-Acevedo, Samir Fernando
dc.date2021-09-06T17:03:08Z
dc.date2021-09-06T17:03:08Z
dc.date2021
dc.date.accessioned2023-10-03T19:02:54Z
dc.date.available2023-10-03T19:02:54Z
dc.identifierhttps://hdl.handle.net/11323/8636
dc.identifierhttps://doi.org/10.1016/j.mineng.2021.107031
dc.identifierCorporación Universidad de la Costa
dc.identifierREDICUC - Repositorio CUC
dc.identifierhttps://repositorio.cuc.edu.co/
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9167106
dc.descriptionThis work studied the influence of several parameters on free cyanide (CN−) degradation (50 mg L−1) by the UVC-activated persulfate (PS) at alkaline conditions (UVC/PS). Firstly, photolysis and alkaline activation of PS were evaluated. Then, the effect of initial PS concentration (0.2, 0.4, and 0.6 g L−1) and dissolved oxygen in solution (absence/presence) were studied. Lastly, the influence of phosphate, carbonate, and nitrate presence at different concentrations (50, 150, 350, and 500 mg L−1) on CN− elimination was tested. Additionally, the electric energy per order (EEO), a measure of the energy consumption in the process was determined, and a mechanistic view of CN− degradation was proposed. The results show that photolysis and alkaline activation of PS degraded 8 and 11% of CN−, respectively, whereas their combination presented a synergistic effect on CN− pollutant elimination. While oxygen had a vital role in photolysis due to the formation of 1O2 to oxidize CN− to CNO−, HO• and SO4•− were primarily responsible for CN− degradation by UVC/PS. It was also found that cyanide removal followed a pseudo-first-order kinetics whose apparent reaction rate constant (k) increased from 0.0104 to 0.0297 min−1 as the initial concentration of PS increased from 0.2 to 0.6 g L−1, indicating a strong dependency of the removal efficiency on the PS amount. Remarkably, cyanide degradation by the combined UVC/PS showed a high CN− conversion and selectivity even in the presence of high concentrations of phosphate, carbonate, and nitrate ions (500 mg L−1), which resulted in CN− removals higher than 80% after 60 min of degradation treatment. Furthermore, the EEO values were similar in the presence and absence of phosphate or carbonate; however, they decreased slightly with nitrate presence. All these results suggest the feasibility of the combined UVC/PS process for the elimination of cyanide such as that found in mining wastewater.
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dc.languageeng
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dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.sourceMinerals Engineering
dc.sourcehttps://www.sciencedirect.com/science/article/abs/pii/S0892687521002600
dc.subjectMining wastewater
dc.subjectPersulfate
dc.subjectAdvanced oxidation process
dc.subjectFree cyanide degradation
dc.subjectDissolved oxygen
dc.subjectInorganic ions
dc.titleEffect of the presence of inorganic ions and operational parameters on free cyanide degradation by ultraviolet C activation of persulfate in synthetic mining wastewater
dc.typeArtículo de revista
dc.typehttp://purl.org/coar/resource_type/c_6501
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