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Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater
We have explored the simultaneous degradation of cyanides and thiocyanate present in wastewaters from a cokemaking factory using photoassisted methods under varied illumination conditions (from simulated solar light to UV light). Overall, the photochemical degradation of cyanides was more efficient...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480199/ https://www.ncbi.nlm.nih.gov/pubmed/30965653 http://dx.doi.org/10.3390/molecules24071373 |
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author | Viña Mediavilla, Juan Jose Fernandez Perez, Begoña Fernandez de Cordoba, Maria C. Ayala Espina, Julia Ania, Conchi O. |
author_facet | Viña Mediavilla, Juan Jose Fernandez Perez, Begoña Fernandez de Cordoba, Maria C. Ayala Espina, Julia Ania, Conchi O. |
author_sort | Viña Mediavilla, Juan Jose |
collection | PubMed |
description | We have explored the simultaneous degradation of cyanides and thiocyanate present in wastewaters from a cokemaking factory using photoassisted methods under varied illumination conditions (from simulated solar light to UV light). Overall, the photochemical degradation of cyanides was more efficient than that of thiocyanates, regardless of the illumination conditions, the effect being more pronounced in the absence of a photocatalyst. This is due to their different degradation mechanism that in the case of thiocyanates is dominated by fast recombination reactions and/or charge transfer reactions to electron scavengers. In all cases, cyanate, ammonia, nitrates, and nitrites were formed at different amounts depending on the illumination conditions. The conversion yield under simulated solar light was almost complete for cyanides and quite high for thiocyanates after 6 h of illumination. Regarding toxicity, photochemical oxidation at 254 nm and under simulated solar light decreased significantly the toxicity of the pristine wastewater, showing a correlation with the intensity of the irradiation source. This indicate that simulated light can be effectively used to reduce the toxicity of industrial effluents, opening an interesting perspective for optimizing cyanide detoxification systems based on natural light. |
format | Online Article Text |
id | pubmed-6480199 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-64801992019-04-30 Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater Viña Mediavilla, Juan Jose Fernandez Perez, Begoña Fernandez de Cordoba, Maria C. Ayala Espina, Julia Ania, Conchi O. Molecules Article We have explored the simultaneous degradation of cyanides and thiocyanate present in wastewaters from a cokemaking factory using photoassisted methods under varied illumination conditions (from simulated solar light to UV light). Overall, the photochemical degradation of cyanides was more efficient than that of thiocyanates, regardless of the illumination conditions, the effect being more pronounced in the absence of a photocatalyst. This is due to their different degradation mechanism that in the case of thiocyanates is dominated by fast recombination reactions and/or charge transfer reactions to electron scavengers. In all cases, cyanate, ammonia, nitrates, and nitrites were formed at different amounts depending on the illumination conditions. The conversion yield under simulated solar light was almost complete for cyanides and quite high for thiocyanates after 6 h of illumination. Regarding toxicity, photochemical oxidation at 254 nm and under simulated solar light decreased significantly the toxicity of the pristine wastewater, showing a correlation with the intensity of the irradiation source. This indicate that simulated light can be effectively used to reduce the toxicity of industrial effluents, opening an interesting perspective for optimizing cyanide detoxification systems based on natural light. MDPI 2019-04-08 /pmc/articles/PMC6480199/ /pubmed/30965653 http://dx.doi.org/10.3390/molecules24071373 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Viña Mediavilla, Juan Jose Fernandez Perez, Begoña Fernandez de Cordoba, Maria C. Ayala Espina, Julia Ania, Conchi O. Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater |
title | Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater |
title_full | Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater |
title_fullStr | Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater |
title_full_unstemmed | Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater |
title_short | Photochemical Degradation of Cyanides and Thiocyanates from an Industrial Wastewater |
title_sort | photochemical degradation of cyanides and thiocyanates from an industrial wastewater |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480199/ https://www.ncbi.nlm.nih.gov/pubmed/30965653 http://dx.doi.org/10.3390/molecules24071373 |
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