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Open AccessFeature PaperArticle

The Suitability of Methylene Blue Discoloration (MB Method) to Investigate the Fe0/MnO2 System

1
Faculty of Natural Sciences, Hung Vuong University, Nguyen Tat Thanh Street, Viet Tri 35120, Phu Tho, Vietnam
2
Angewandte Geologie, Universität Göttingen, Goldschmidtstraße 3, D-37077 Göttingen, Germany
3
Department of Chemistry, Faculty of Science, University of Maroua, BP 46 Maroua, Cameroon
4
Biosystems and Environmental Engineering Research Group, Department of Soil Science and Agricultural Engineering, University of Zimbabwe, P.O. Box MP167, Mt. Pleasant, Harare, Zimbabwe
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Centre for Modern Indian Studies (CeMIS), Universität Göttingen, Waldweg 26, 37073 Göttingen, Germany
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Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania
*
Author to whom correspondence should be addressed.
Academic Editor: José A. Peres
Processes 2021, 9(3), 548; https://doi.org/10.3390/pr9030548
Received: 22 February 2021 / Revised: 4 March 2021 / Accepted: 15 March 2021 / Published: 19 March 2021
The typical time-dependent decrease of the iron corrosion rate is often difficult to consider while designing Fe0-based remediation systems. One of the most promising approaches is the amendment with manganese dioxide (Fe0/MnO2 system). The resulting system is a very complex one where characterization is challenging. The present communication uses methylene blue discoloration (MB method) to characterize the Fe0/MnO2 system. Shaken batch experiments (75 rpm) for 7 days were used. The initial MB concentration was 10 mg L−1 with the following mass loading: [MnO2] = 2.3 g L−1, [sand] = 45 g L−1, and 0 < [Fe0] (g L−1) ≤ 45. The following systems where investigated: Fe0, MnO2, sand, Fe0/MnO2, Fe0/sand, and Fe0/MnO2/sand. Results demonstrated that MB discoloration is influenced by the diffusive transport of MB from the solution to the aggregates at the bottom of the test-tubes. Results confirm the complexity of the Fe0/MnO2/sand system, while establishing that both MnO2 and sand improve the efficiency of Fe0/H2O systems in the long-term. The mechanisms of water decontamination by amending Fe0-based systems with MnO2 is demonstrated by the MB method. View Full-Text
Keywords: manganese oxides; MB method; reactivity materials; water treatment; zero-valent iron manganese oxides; MB method; reactivity materials; water treatment; zero-valent iron
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MDPI and ACS Style

Cao, V.; Alyoussef, G.; Gatcha-Bandjun, N.; Gwenzi, W.; Noubactep, C. The Suitability of Methylene Blue Discoloration (MB Method) to Investigate the Fe0/MnO2 System. Processes 2021, 9, 548. https://doi.org/10.3390/pr9030548

AMA Style

Cao V, Alyoussef G, Gatcha-Bandjun N, Gwenzi W, Noubactep C. The Suitability of Methylene Blue Discoloration (MB Method) to Investigate the Fe0/MnO2 System. Processes. 2021; 9(3):548. https://doi.org/10.3390/pr9030548

Chicago/Turabian Style

Cao, Viet; Alyoussef, Ghinwa; Gatcha-Bandjun, Nadège; Gwenzi, Willis; Noubactep, Chicgoua. 2021. "The Suitability of Methylene Blue Discoloration (MB Method) to Investigate the Fe0/MnO2 System" Processes 9, no. 3: 548. https://doi.org/10.3390/pr9030548

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