Noubactep, Chicgoua

[["dc.bibliographiccitation.firstpage","8338"],["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","Sustainability"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Huang, Zhe"],["dc.contributor.author","Nya, Esther Laurentine"],["dc.contributor.author","Rahman, Mohammad Azizur"],["dc.contributor.author","Mwamila, Tulinave Burton"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2021-09-01T06:43:02Z"],["dc.date.available","2021-09-01T06:43:02Z"],["dc.date.issued","2021"],["dc.description.abstract","Rainwater harvesting (RWH) is generally perceived as a promising cost-effective alternative water resource for potable and non-potable uses (water augmentation) and for reducing flood risks. The performance of RWH systems has been evaluated for various purposes over the past few decades. These systems certainly provide economic, environmental, and technological benefits of water uses. However, regarding RWH just as an effective alternative water supply to deal with the water scarcity is a mistake. The present communication advocates for a systematic RWH and partial infiltration wherever and whenever rain falls. By doing so, the detrimental effects of flooding are reduced, groundwater is recharged, water for agriculture and livestock is stored, and conventional water sources are saved. In other words, RWH should be at the heart of water management worldwide. The realization of this goal is easy even under low-resource situations, as infiltration pits and small dams can be constructed with local skills and materials."],["dc.description.abstract","Rainwater harvesting (RWH) is generally perceived as a promising cost-effective alternative water resource for potable and non-potable uses (water augmentation) and for reducing flood risks. The performance of RWH systems has been evaluated for various purposes over the past few decades. These systems certainly provide economic, environmental, and technological benefits of water uses. However, regarding RWH just as an effective alternative water supply to deal with the water scarcity is a mistake. The present communication advocates for a systematic RWH and partial infiltration wherever and whenever rain falls. By doing so, the detrimental effects of flooding are reduced, groundwater is recharged, water for agriculture and livestock is stored, and conventional water sources are saved. In other words, RWH should be at the heart of water management worldwide. The realization of this goal is easy even under low-resource situations, as infiltration pits and small dams can be constructed with local skills and materials."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.3390/su13158338"],["dc.identifier.pii","su13158338"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/89204"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-455"],["dc.relation.eissn","2071-1050"],["dc.relation.orgunit","Abteilung Angewandte Geologie"],["dc.rights","CC BY 4.0"],["dc.title","Integrated Water Resource Management: Rethinking the Contribution of Rainwater Harvesting"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","12069"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Alyoussef, Ghinwa"],["dc.contributor.author","Gatcha-Bandjun, Nadège"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2021-08-12T07:45:00Z"],["dc.date.available","2021-08-12T07:45:00Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract Metallic iron (Fe 0 ) has shown outstanding performances for water decontamination and its efficiency has been improved by the presence of sand (Fe 0 /sand) and manganese oxide (Fe 0 /MnO x ). In this study, a ternary Fe 0 /MnO x /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 Fe 0 /H 2 O systems using MB as an operational tracer of reactivity. The premise was that, in the short term, both MnO 2 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 MnO x 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 Fe 0 /MnO x /sand system, while establishing that both MnO x and sand improve the efficiency of Fe 0 /H 2 O systems in the long-term. This study establishes the mechanisms of the promotion of water decontamination by amending Fe 0 -based systems with reactive MnO x ."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.1038/s41598-021-91475-x"],["dc.identifier.pii","91475"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/88350"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-448"],["dc.relation.eissn","2045-2322"],["dc.rights","CC BY 4.0"],["dc.title","The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","548"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Processes"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Alyoussef, Ghinwa"],["dc.contributor.author","Gatcha-Bandjun, Nadège"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2021-06-01T09:42:41Z"],["dc.date.available","2021-06-01T09:42:41Z"],["dc.date.issued","2021"],["dc.description.abstract","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."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.3390/pr9030548"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85321"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.publisher","MDPI"],["dc.relation.eissn","2227-9717"],["dc.relation.orgunit","Abteilung Angewandte Geologie"],["dc.rights","CC BY 4.0"],["dc.title","The Suitability of Methylene Blue Discoloration (MB Method) to Investigate the Fe0/MnO2 System"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","977"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Processes"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Yang, Huichen"],["dc.contributor.author","Ndé-Tchoupé, Arnaud Igor"],["dc.contributor.author","Hu, Rui"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2021-04-14T08:23:45Z"],["dc.date.available","2021-04-14T08:23:45Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.3390/pr8080977"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17509"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81036"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","MDPI"],["dc.relation.eissn","2227-9717"],["dc.rights","CC BY 4.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Tracing the Scientific History of Fe0-Based Environmental Remediation Prior to the Advent of Permeable Reactive Barriers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3120"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","Water"],["dc.bibliographiccitation.volume","14"],["dc.contributor.affiliation","Cao, Viet; 1Faculty of Natural Sciences, Hung Vuong University, Nguyen Tat Thanh Street, Viet Tri 35120, Phu Tho, Vietnam"],["dc.contributor.affiliation","Bakari, Omari; 2Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania"],["dc.contributor.affiliation","Kenmogne-Tchidjo, Joseline Flore; 3Department of Chemistry, Faculty of Sciences, University of Yaoundé I, Yaoundé P.O. Box 812, Cameroon"],["dc.contributor.affiliation","Gatcha-Bandjun, Nadège; 4Faculty of Science, Department of Chemistry, University of Maroua, Maroua P.O. Box 46, Cameroon"],["dc.contributor.affiliation","Ndé-Tchoupé, Arnaud Igor; 5School of Earth Science and Engineering, Hohai University, Fo Cheng Xi Road 8, Nanjing 211100, China"],["dc.contributor.affiliation","Gwenzi, Willis; 6Grassland Science and Renewable Plant Resources, Faculty of Organic Agricultural Science, University of Kassel, Steinstrasse 19, D-37213 Witzenhausen, Germany"],["dc.contributor.affiliation","Njau, Karoli N.; 2Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania"],["dc.contributor.affiliation","Noubactep, Chicgoua; 2Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Bakari, Omari"],["dc.contributor.author","Kenmogne-Tchidjo, Joseline Flore"],["dc.contributor.author","Gatcha-Bandjun, Nadège"],["dc.contributor.author","Ndé-Tchoupé, Arnaud Igor"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Njau, Karoli N."],["dc.contributor.author","Noubactep, Chicgoua"],["dc.contributor.editor","Paulino, Alexandre T."],["dc.date.accessioned","2022-11-01T10:17:31Z"],["dc.date.available","2022-11-01T10:17:31Z"],["dc.date.issued","2022"],["dc.date.updated","2022-11-11T13:11:42Z"],["dc.description.abstract","Science denial relates to rejecting well-established views that are no longer questioned by scientists within a given community. This expression is frequently connected with climate change and evolution. In such cases, prevailing views are built on historical facts and consensus. For water remediation using metallic iron (Fe0), also known as the remediation Fe0/H2O system, a consensus on electro-chemical contaminant reduction was established during the 1990s and still prevails. Arguments against the reductive transformation concept have been regarded for more than a decade as ‘science denial’. However, is it the prevailing concept that denies the science of aqueous iron corrosion? This article retraces the path taken by our research group to question the reductive transformation concept. It is shown that the validity of the following has been questioned: (i) analytical applications of the arsenazo III method for the determination of uranium, (ii) molecular diffusion as sole relevant mass-transport process in the vicinity of the Fe0 surface in filtration systems, and (iii) the volumetric expansive nature of iron corrosion at pH > 4.5. Item (i) questions the capability of Fe0 to serve as an electron donor for UVI reduction under environmental conditions. Items (ii) and (iii) are inter-related, as the Fe0 surface is permanently shielded by a non-conductive oxide scale acting as a diffusion barrier to dissolved species and a barrier to electrons from Fe0. The net result is that no electron transfer from Fe0 to contaminants is possible under environmental conditions. This conclusion refutes the validity of the reductive transformation concept and calls for alternative theories."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2022"],["dc.identifier.doi","10.3390/w14193120"],["dc.identifier.pii","w14193120"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/116828"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-605"],["dc.publisher","MDPI"],["dc.relation.eissn","2073-4441"],["dc.rights","CC BY 4.0"],["dc.title","Conceptualizing the Fe0/H2O System: A Call for Collaboration to Mark the 30th Anniversary of the Fe0-Based Permeable Reactive Barrier Technology"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","58"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Processes"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Huang, Zhe"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Nya, Esther Laurentine"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2021-04-14T08:29:36Z"],["dc.date.available","2021-04-14T08:29:36Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.3390/pr9010058"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17809"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82943"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","MDPI"],["dc.relation.eissn","2227-9717"],["dc.rights","CC BY 4.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Kanchan Arsenic Filters and the Future of Fe0-Based Filtration Systems for Single Household Drinking Water Supply"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","9814"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Alyoussef, Ghinwa"],["dc.contributor.author","Gatcha-Bandjun, Nadège"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2021-07-05T15:00:32Z"],["dc.date.available","2021-07-05T15:00:32Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract The role of manganese dioxide (MnO 2 ) in the process of water treatment using metallic iron (Fe 0 /H 2 O) was investigated in quiescent batch experiments for t ≤ 60 d. MnO 2 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) Fe 0 , (2) MnO 2 , (3) sand, (4) Fe 0 /sand, (5) Fe 0 /MnO 2 , and (6) Fe 0 /sand/MnO 2 . 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 MnO 2 loading increases from 2.3 to 45 g L −1 . MB discoloration is only quantitative when the operational fixation capacity of MnO 2 for Fe 2+ 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 Fe 0 /H 2 O systems. Hybrid Fe 0 /MnO 2 systems are potential candidates for the design of more sustainable Fe 0 filters."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.1038/s41598-021-89318-w"],["dc.identifier.pii","89318"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87848"],["dc.language.iso","en"],["dc.notes.intern","DOI Import DOI-Import GROB-441"],["dc.relation.eissn","2045-2322"],["dc.rights","CC BY 4.0"],["dc.title","Characterizing the impact of MnO2 addition on the efficiency of Fe0/H2O systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","641"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Water"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Hu, Rui"],["dc.contributor.author","Yang, Huichen"],["dc.contributor.author","Tao, Ran"],["dc.contributor.author","Cui, Xuesong"],["dc.contributor.author","Xiao, Minhui"],["dc.contributor.author","Amoah, Bernard Konadu"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Lufingo, Mesia"],["dc.contributor.author","Soppa-Sangue, Naomi Paloma"],["dc.contributor.author","Ndé-Tchoupé, Arnaud Igor"],["dc.contributor.author","Gatcha-Bandjun, Nadège"],["dc.contributor.author","Sipowo-Tala, Viviane Raïssa"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2020-12-10T18:47:25Z"],["dc.date.available","2020-12-10T18:47:25Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.3390/w12030641"],["dc.identifier.eissn","2073-4441"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78760"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.publisher","MDPI"],["dc.relation.eissn","2073-4441"],["dc.rights","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Metallic Iron for Environmental Remediation: Starting an Overdue Progress in Knowledge"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","217"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Applied Water Science"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Konadu-Amoah, Bernard"],["dc.contributor.author","Hu, Rui"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Tao, Ran"],["dc.contributor.author","Yang, Huichen"],["dc.contributor.author","Ndé-Tchoupé, Arnaud I."],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Ruppert, Hans"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2022-08-12T12:13:44Z"],["dc.date.available","2022-08-12T12:13:44Z"],["dc.date.issued","2022-08-02"],["dc.date.updated","2022-08-07T03:11:44Z"],["dc.description.abstract","Metallic iron (Fe0) has been increasingly used to remove toxics from water over the past three decades. However, the idea that metallic iron (Fe0) is not an environmental reducing agent has been vigorously refuted. Researchers presenting their findings in a scientific journal have to accept the burden of proving that their argument has any validity. This 30-year-lasting discussion within the Fe0 remediation community is alien to electro-chemists, as it is a century-old knowledge. Nevertheless, the peer-reviewed literature on “remediation using Fe0” seems to be dominated by evaluators thinking that Fe0 is a reducing agent. This communication challenges the view that Fe0 donates any electron to any dissolved species. The sole goal is to reconcile a proven efficient technology with its scientific roots and enable the design of better Fe0 remediation systems."],["dc.identifier.citation","Applied Water Science. 2022 Aug 02;12(9):217"],["dc.identifier.doi","10.1007/s13201-022-01738-9"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/112720"],["dc.language.iso","en"],["dc.rights","CC BY 4.0"],["dc.rights.holder","The Author(s)"],["dc.subject","Electrochemical dissolution kinetics"],["dc.subject","Groundwater remediation"],["dc.subject","Permeable reactive barrier"],["dc.subject","Water treatment"],["dc.subject","Zero-valent iron"],["dc.title","Realizing the potential of metallic iron for the mitigation of toxics: flee or adapt?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Frontiers in Environmental Chemistry"],["dc.bibliographiccitation.volume","2"],["dc.contributor.affiliation","Hu, Rui; \r\n\r\n1\r\nSchool of Earth Science and Engineering, Hohai University, Nanjing, China"],["dc.contributor.affiliation","Ndé-Tchoupé, Arnaud Igor; \r\n\r\n1\r\nSchool of Earth Science and Engineering, Hohai University, Nanjing, China"],["dc.contributor.affiliation","Cao, Viet; \r\n\r\n2\r\nFaculty of Natural Sciences, Hung Vuong University, Ho Chi Minh, Vietnam"],["dc.contributor.affiliation","Gwenzi, Willis; \r\n\r\n3\r\nBiosystems and Environmental Engineering Research Group, Department of Soil Science and Agricultural Engineering, University of Zimbabwe, Harare, Zimbabwe"],["dc.contributor.affiliation","Noubactep, Chicgoua; \r\n\r\n4\r\nDepartment of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania"],["dc.contributor.author","Hu, Rui"],["dc.contributor.author","Ndé-Tchoupé, Arnaud Igor"],["dc.contributor.author","Cao, Viet"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2022-06-16T09:04:34Z"],["dc.date.available","2022-06-16T09:04:34Z"],["dc.date.issued","2021"],["dc.date.updated","2022-09-04T01:58:18Z"],["dc.description.abstract","The suitability of remediation systems using metallic iron (Fe0) has been extensively discussed during the past 3 decades. It has been established that aqueous Fe0 oxidative dissolution is not caused by the presence of any contaminant. Instead, the reductive transformation of contaminants is a consequence of Fe0 oxidation. Yet researchers are still maintaining that electrons from the metal body are involved in the process of contaminant reduction. According to the electron efficiency concept, electrons from Fe0 should be redistributed to: i) contaminants of concern (COCs), ii) natural reducing agents (e.g., H2O, O2), and/or iii) reducible co-contaminants (e.g. NO3-). The electron efficiency is defined as the fraction of electrons from Fe0 oxidation which is utilized for the reductive transformations of COCs. This concept is in frontal contradiction with the view that Fe0 is not directly involved in the process of contaminant reduction. This communication recalls the universality of the concept that reductive processes observed in remediation Fe0/H2O systems are mediated by primary (e.g., FeII, H/H2) and secondary (e.g., Fe3O4, green rusts) products of aqueous iron corrosion. The critical evaluation of the electron efficiency concept suggests that it should be abandoned. Instead, research efforts should be directed towards tackling the real challenges for the design of sustainable Fe0-based water treatment systems based on fundamental mechanisms of iron corrosion."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.3389/fenvc.2021.677813"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/111277"],["dc.language.iso","en"],["dc.relation.eissn","2673-4486"],["dc.relation.issn","2673-4486"],["dc.relation.orgunit","Abteilung Angewandte Geologie"],["dc.rights","CC BY 4.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Metallic Iron for Environmental Remediation: The Fallacy of the Electron Efficiency Concept"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]