The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems

Abstract Metallic iron (Fe0) has shown outstanding performances for water decontamination and its efficiency has been improved by the presence of sand (Fe0/sand) and manganese oxide (Fe0/MnOx). In this study, a ternary Fe0/MnOx/sand system is characterized for its discoloration efficiency of methyle...

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Autores principales:	Viet Cao, Ghinwa Alyoussef, Nadège Gatcha-Bandjun, Willis Gwenzi, Chicgoua Noubactep
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0514b6b7d08644ceb1683693dcb47d77
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spelling	oai:doaj.org-article:0514b6b7d08644ceb1683693dcb47d772021-12-02T17:48:00ZThe key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems10.1038/s41598-021-91475-x2045-2322https://doaj.org/article/0514b6b7d08644ceb1683693dcb47d772021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91475-xhttps://doaj.org/toc/2045-2322Abstract Metallic iron (Fe0) has shown outstanding performances for water decontamination and its efficiency has been improved by the presence of sand (Fe0/sand) and manganese oxide (Fe0/MnOx). In this study, a ternary Fe0/MnOx/sand system is characterized for its discoloration efficiency of methylene blue (MB) in quiescent batch studies for 7, 18, 25 and 47 days. The objective was to understand the fundamental mechanisms of water treatment in Fe0/H2O systems using MB as an operational tracer of reactivity. The premise was that, in the short term, both MnO2 and sand delay MB discoloration by avoiding the availability of free iron corrosion products (FeCPs). Results clearly demonstrate no monotonous increase in MB discoloration with increasing contact time. As a rule, the extent of MB discoloration is influenced by the diffusive transport of MB from the solution to the aggregates at the bottom of the vessels (test-tubes). The presence of MnOx and sand enabled the long-term generation of iron hydroxides for MB discoloration by adsorption and co-precipitation. Results clearly reveal the complexity of the Fe0/MnOx/sand system, while establishing that both MnOx and sand improve the efficiency of Fe0/H2O systems in the long-term. This study establishes the mechanisms of the promotion of water decontamination by amending Fe0-based systems with reactive MnOx.Viet CaoGhinwa AlyoussefNadège Gatcha-BandjunWillis GwenziChicgoua NoubactepNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Viet Cao Ghinwa Alyoussef Nadège Gatcha-Bandjun Willis Gwenzi Chicgoua Noubactep The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems
description	Abstract Metallic iron (Fe0) has shown outstanding performances for water decontamination and its efficiency has been improved by the presence of sand (Fe0/sand) and manganese oxide (Fe0/MnOx). In this study, a ternary Fe0/MnOx/sand system is characterized for its discoloration efficiency of methylene blue (MB) in quiescent batch studies for 7, 18, 25 and 47 days. The objective was to understand the fundamental mechanisms of water treatment in Fe0/H2O systems using MB as an operational tracer of reactivity. The premise was that, in the short term, both MnO2 and sand delay MB discoloration by avoiding the availability of free iron corrosion products (FeCPs). Results clearly demonstrate no monotonous increase in MB discoloration with increasing contact time. As a rule, the extent of MB discoloration is influenced by the diffusive transport of MB from the solution to the aggregates at the bottom of the vessels (test-tubes). The presence of MnOx and sand enabled the long-term generation of iron hydroxides for MB discoloration by adsorption and co-precipitation. Results clearly reveal the complexity of the Fe0/MnOx/sand system, while establishing that both MnOx and sand improve the efficiency of Fe0/H2O systems in the long-term. This study establishes the mechanisms of the promotion of water decontamination by amending Fe0-based systems with reactive MnOx.
format	article
author	Viet Cao Ghinwa Alyoussef Nadège Gatcha-Bandjun Willis Gwenzi Chicgoua Noubactep
author_facet	Viet Cao Ghinwa Alyoussef Nadège Gatcha-Bandjun Willis Gwenzi Chicgoua Noubactep
author_sort	Viet Cao
title	The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems
title_short	The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems
title_full	The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems
title_fullStr	The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems
title_full_unstemmed	The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems
title_sort	key role of contact time in elucidating the mechanisms of enhanced decontamination by fe0/mno2/sand systems
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0514b6b7d08644ceb1683693dcb47d77
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The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems

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