Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation

Among the halogenated aromatic compounds, as toxic and carcinogenic materials, 4-chloro-hydroxybenzene (4CHB) has been known as a priority pollutant that is present in industrial effluents at high concentrations. Unlike previous studies that have used nanoscale zero valent iron (nZVI) for activation...

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Autores principales:	Abdolmotaleb Seidmohammadi, Ghorban Asgari, Raheleh Amiri, Ghasem Azarian
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	4-chloro-hydroxybenzene Advance oxidation process Persulfate activation UV-LEDs Fe (II) Renewable energy sources TJ807-830 Environmental engineering TA170-171
Acceso en línea:	https://doaj.org/article/f5e849fc5d204bf1b4106f588def3f89
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spelling	oai:doaj.org-article:f5e849fc5d204bf1b4106f588def3f892021-11-10T04:42:46ZOxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation2666-790810.1016/j.clet.2021.100337https://doaj.org/article/f5e849fc5d204bf1b4106f588def3f892021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666790821002974https://doaj.org/toc/2666-7908Among the halogenated aromatic compounds, as toxic and carcinogenic materials, 4-chloro-hydroxybenzene (4CHB) has been known as a priority pollutant that is present in industrial effluents at high concentrations. Unlike previous studies that have used nanoscale zero valent iron (nZVI) for activation of S2O82− in various catalytic processes, in the present study, Fe2+ was used in UV-LEDs/S2O82−/Fe2+ process to remove 4CHB from aqueous solutions. Moreover, the effects of various parameters, including contact time, solution pH, 4CHB concentration, Fe2+ concentration, and S2O82− concentration were evaluated on the process efficiency. Results showed that under optimal conditions (including contact time 90 min, 4CHB concentration 30 mg/L, S2O82− 1.27 mM, and Fe (II) concentration 0.3 mM), the removal efficiency of 4CHB and chemical oxygen demand (COD) using the UV-LEDs/S2O82−/Fe2+ process were 98% and 58%, respectively. The calculated synergistic effect (SE) for the UV-LEDs/S2O82−/Fe2+ process was obtained to be 1.88, which is higher than 1, indicating the SE of iron ions and UV-LED radiation in the activation of S2O82− and production of persulfate and hydroxyl radicals for 4CHB removal. Voltammetric experiments demonstrated that 4CHB was completely degraded, and there was no electroactive intermediate in the solution after 120 min of reaction. While longer contact time was required to mineralize 4CHB and other intermediates. In this regard, increasing the retention time to 120 min improved the COD removal efficiency up to 69%. Based on the results of this study, it can be concluded that the use of Fe+2 under UV-LED irradiation can be used as an efficient, cost-effective, and practical process for 4CHB removal. Therefore, this process does not require much time and cost to produce nZVI or other iron species.Abdolmotaleb SeidmohammadiGhorban AsgariRaheleh AmiriGhasem AzarianElsevierarticle4-chloro-hydroxybenzeneAdvance oxidation processPersulfate activationUV-LEDsFe (II)Renewable energy sourcesTJ807-830Environmental engineeringTA170-171ENCleaner Engineering and Technology, Vol 5, Iss , Pp 100337- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	4-chloro-hydroxybenzene Advance oxidation process Persulfate activation UV-LEDs Fe (II) Renewable energy sources TJ807-830 Environmental engineering TA170-171
spellingShingle	4-chloro-hydroxybenzene Advance oxidation process Persulfate activation UV-LEDs Fe (II) Renewable energy sources TJ807-830 Environmental engineering TA170-171 Abdolmotaleb Seidmohammadi Ghorban Asgari Raheleh Amiri Ghasem Azarian Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation
description	Among the halogenated aromatic compounds, as toxic and carcinogenic materials, 4-chloro-hydroxybenzene (4CHB) has been known as a priority pollutant that is present in industrial effluents at high concentrations. Unlike previous studies that have used nanoscale zero valent iron (nZVI) for activation of S2O82− in various catalytic processes, in the present study, Fe2+ was used in UV-LEDs/S2O82−/Fe2+ process to remove 4CHB from aqueous solutions. Moreover, the effects of various parameters, including contact time, solution pH, 4CHB concentration, Fe2+ concentration, and S2O82− concentration were evaluated on the process efficiency. Results showed that under optimal conditions (including contact time 90 min, 4CHB concentration 30 mg/L, S2O82− 1.27 mM, and Fe (II) concentration 0.3 mM), the removal efficiency of 4CHB and chemical oxygen demand (COD) using the UV-LEDs/S2O82−/Fe2+ process were 98% and 58%, respectively. The calculated synergistic effect (SE) for the UV-LEDs/S2O82−/Fe2+ process was obtained to be 1.88, which is higher than 1, indicating the SE of iron ions and UV-LED radiation in the activation of S2O82− and production of persulfate and hydroxyl radicals for 4CHB removal. Voltammetric experiments demonstrated that 4CHB was completely degraded, and there was no electroactive intermediate in the solution after 120 min of reaction. While longer contact time was required to mineralize 4CHB and other intermediates. In this regard, increasing the retention time to 120 min improved the COD removal efficiency up to 69%. Based on the results of this study, it can be concluded that the use of Fe+2 under UV-LED irradiation can be used as an efficient, cost-effective, and practical process for 4CHB removal. Therefore, this process does not require much time and cost to produce nZVI or other iron species.
format	article
author	Abdolmotaleb Seidmohammadi Ghorban Asgari Raheleh Amiri Ghasem Azarian
author_facet	Abdolmotaleb Seidmohammadi Ghorban Asgari Raheleh Amiri Ghasem Azarian
author_sort	Abdolmotaleb Seidmohammadi
title	Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation
title_short	Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation
title_full	Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation
title_fullStr	Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation
title_full_unstemmed	Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation
title_sort	oxidative removal of 4-chloro-hydroxybenzene using catalyzed s2o82− with fe2+ under uv-led irradiation
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/f5e849fc5d204bf1b4106f588def3f89
work_keys_str_mv	AT abdolmotalebseidmohammadi oxidativeremovalof4chlorohydroxybenzeneusingcatalyzeds2o82withfe2underuvledirradiation AT ghorbanasgari oxidativeremovalof4chlorohydroxybenzeneusingcatalyzeds2o82withfe2underuvledirradiation AT rahelehamiri oxidativeremovalof4chlorohydroxybenzeneusingcatalyzeds2o82withfe2underuvledirradiation AT ghasemazarian oxidativeremovalof4chlorohydroxybenzeneusingcatalyzeds2o82withfe2underuvledirradiation
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Oxidative removal of 4-chloro-hydroxybenzene using catalyzed S2O82− with Fe2+ under UV-LED irradiation

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