Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems

Abstract The role of manganese dioxide (MnO2) in the process of water treatment using metallic iron (Fe0/H2O) was investigated in quiescent batch experiments for t ≤ 60 d. MnO2 was used as an agent to control the availability of solid iron corrosion products (FeCPs) while methylene blue (MB) was an...

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Auteurs principaux:	Viet Cao, Ghinwa Alyoussef, Nadège Gatcha-Bandjun, Willis Gwenzi, Chicgoua Noubactep
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2021
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/8f7fda09c0c54a41a7a6572a29b7dff7
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spelling	oai:doaj.org-article:8f7fda09c0c54a41a7a6572a29b7dff72021-12-02T16:51:38ZCharacterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems10.1038/s41598-021-89318-w2045-2322https://doaj.org/article/8f7fda09c0c54a41a7a6572a29b7dff72021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89318-whttps://doaj.org/toc/2045-2322Abstract The role of manganese dioxide (MnO2) in the process of water treatment using metallic iron (Fe0/H2O) was investigated in quiescent batch experiments for t ≤ 60 d. MnO2 was used as an agent to control the availability of solid iron corrosion products (FeCPs) while methylene blue (MB) was an indicator of reactivity. The investigated systems were: (1) Fe0, (2) MnO2, (3) sand, (4) Fe0/sand, (5) Fe0/MnO2, and (6) Fe0/sand/MnO2. The experiments were performed in test tubes each containing 22.0 mL of MB (10 mg L−1) and the solid aggregates. The initial pH value was 8.2. Each system was characterized for the final concentration of H+, Fe, and MB. Results show no detectable level of dissolved iron after 47 days. Final pH values varied from 7.4 to 9.8. The MB discoloration efficiency varies from 40 to 80% as the MnO2 loading increases from 2.3 to 45 g L−1. MB discoloration is only quantitative when the operational fixation capacity of MnO2 for Fe2+ was exhausted. This corresponds to the event where adsorption and co-precipitation with FeCPs is intensive. Adsorption and co-precipitation are thus the fundamental mechanisms of decontamination in Fe0/H2O systems. Hybrid Fe0/MnO2 systems are potential candidates for the design of more sustainable Fe0 filters.Viet CaoGhinwa AlyoussefNadège Gatcha-BandjunWillis GwenziChicgoua NoubactepNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (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 Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems
description	Abstract The role of manganese dioxide (MnO2) in the process of water treatment using metallic iron (Fe0/H2O) was investigated in quiescent batch experiments for t ≤ 60 d. MnO2 was used as an agent to control the availability of solid iron corrosion products (FeCPs) while methylene blue (MB) was an indicator of reactivity. The investigated systems were: (1) Fe0, (2) MnO2, (3) sand, (4) Fe0/sand, (5) Fe0/MnO2, and (6) Fe0/sand/MnO2. The experiments were performed in test tubes each containing 22.0 mL of MB (10 mg L−1) and the solid aggregates. The initial pH value was 8.2. Each system was characterized for the final concentration of H+, Fe, and MB. Results show no detectable level of dissolved iron after 47 days. Final pH values varied from 7.4 to 9.8. The MB discoloration efficiency varies from 40 to 80% as the MnO2 loading increases from 2.3 to 45 g L−1. MB discoloration is only quantitative when the operational fixation capacity of MnO2 for Fe2+ was exhausted. This corresponds to the event where adsorption and co-precipitation with FeCPs is intensive. Adsorption and co-precipitation are thus the fundamental mechanisms of decontamination in Fe0/H2O systems. Hybrid Fe0/MnO2 systems are potential candidates for the design of more sustainable Fe0 filters.
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	Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems
title_short	Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems
title_full	Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems
title_fullStr	Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems
title_full_unstemmed	Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems
title_sort	characterizing the impact of mno2 addition on the efficiency of fe0/h2o systems
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8f7fda09c0c54a41a7a6572a29b7dff7
work_keys_str_mv	AT vietcao characterizingtheimpactofmno2additionontheefficiencyoffe0h2osystems AT ghinwaalyoussef characterizingtheimpactofmno2additionontheefficiencyoffe0h2osystems AT nadegegatchabandjun characterizingtheimpactofmno2additionontheefficiencyoffe0h2osystems AT willisgwenzi characterizingtheimpactofmno2additionontheefficiencyoffe0h2osystems AT chicgouanoubactep characterizingtheimpactofmno2additionontheefficiencyoffe0h2osystems
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Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems

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