Characterizing the impact of pyrite addition on the efficiency of Fe0/H2O systems
Abstract The role of pyrite (FeS2) in the process of water treatment using metallic iron (Fe0) was investigated. FeS2 was used as a pH-shifting agent while methylene blue (MB) and methyl orange (MO) were used as an indicator of reactivity and model contaminant, respectively. The effect of the final...
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2021-01-01
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doaj-48b82dce7f2e4fafb107ea91353bf4d72021-01-31T16:24:16ZengNature Publishing GroupScientific Reports2045-23222021-01-0111111310.1038/s41598-021-81649-yCharacterizing the impact of pyrite addition on the efficiency of Fe0/H2O systemsRui Hu0Xuesong Cui1Minhui Xiao2Willis Gwenzi3Chicgoua Noubactep4School of Earth Science and Engineering, Hohai UniversitySchool of Earth Science and Engineering, Hohai UniversitySchool of Earth Science and Engineering, Hohai UniversityDepartment of Soil Science and Agricultural Engineering, Biosystems and Environmental Engineering Research Group, Faculty of Agriculture, University of ZimbabweDepartment of Applied Geology, University of GöttingenAbstract The role of pyrite (FeS2) in the process of water treatment using metallic iron (Fe0) was investigated. FeS2 was used as a pH-shifting agent while methylene blue (MB) and methyl orange (MO) were used as an indicator of reactivity and model contaminant, respectively. The effect of the final pH value on the extent of MB discoloration was characterized using 5 g L−1 of a Fe0 specimen. pH variation was achieved by adding 0 to 30 g L−1 of FeS2. Quiescent batch experiments with Fe0/FeS2/sand systems (sand loading: 25 g L−1) and 20 mL of MB were performed for 41 days. Final pH values varied from 3.3 to 7.0. Results demonstrated that MB discoloration is only quantitative when the final pH value was larger than 4.5 and that adsorption and co-precipitation are the fundamental mechanisms of decontamination in Fe0/H2O systems. Such mechanisms are consistent with the effects of the pH value on the decontamination process.https://doi.org/10.1038/s41598-021-81649-y |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Rui Hu Xuesong Cui Minhui Xiao Willis Gwenzi Chicgoua Noubactep |
spellingShingle |
Rui Hu Xuesong Cui Minhui Xiao Willis Gwenzi Chicgoua Noubactep Characterizing the impact of pyrite addition on the efficiency of Fe0/H2O systems Scientific Reports |
author_facet |
Rui Hu Xuesong Cui Minhui Xiao Willis Gwenzi Chicgoua Noubactep |
author_sort |
Rui Hu |
title |
Characterizing the impact of pyrite addition on the efficiency of Fe0/H2O systems |
title_short |
Characterizing the impact of pyrite addition on the efficiency of Fe0/H2O systems |
title_full |
Characterizing the impact of pyrite addition on the efficiency of Fe0/H2O systems |
title_fullStr |
Characterizing the impact of pyrite addition on the efficiency of Fe0/H2O systems |
title_full_unstemmed |
Characterizing the impact of pyrite addition on the efficiency of Fe0/H2O systems |
title_sort |
characterizing the impact of pyrite addition on the efficiency of fe0/h2o systems |
publisher |
Nature Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2021-01-01 |
description |
Abstract The role of pyrite (FeS2) in the process of water treatment using metallic iron (Fe0) was investigated. FeS2 was used as a pH-shifting agent while methylene blue (MB) and methyl orange (MO) were used as an indicator of reactivity and model contaminant, respectively. The effect of the final pH value on the extent of MB discoloration was characterized using 5 g L−1 of a Fe0 specimen. pH variation was achieved by adding 0 to 30 g L−1 of FeS2. Quiescent batch experiments with Fe0/FeS2/sand systems (sand loading: 25 g L−1) and 20 mL of MB were performed for 41 days. Final pH values varied from 3.3 to 7.0. Results demonstrated that MB discoloration is only quantitative when the final pH value was larger than 4.5 and that adsorption and co-precipitation are the fundamental mechanisms of decontamination in Fe0/H2O systems. Such mechanisms are consistent with the effects of the pH value on the decontamination process. |
url |
https://doi.org/10.1038/s41598-021-81649-y |
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