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Chicgoua Noubactep   Dr.  Senior Scientist or Principal Investigator 
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Chicgoua Noubactep published an article in May 2018.
Top co-authors
P Dietrich

68 shared publications

Richard Crane

35 shared publications

Interface Analysis Centre, University of Bristol, Bristol, UK

Antoine Ghauch

33 shared publications

Faculty of Arts and Sciences, Department of Chemistry, American University of Beirut, Beirut, Lebanon

Günther Meinrath

13 shared publications

Sabine Caré

6 shared publications

Publication Record
Distribution of Articles published per year 
(1970 - 2018)
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Article 0 Reads 0 Citations Avoiding the Use of Exhausted Drinking Water Filters: A Filter-Clock Based on Rusting Iron Arnaud Igor Ndé-Tchoupé, Mesia Lufingo, Rui Hu, Willis Gwenz... Published: 02 May 2018
Water, doi: 10.3390/w10050591
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Efficient but affordable water treatment technologies are currently sought to solve the prevalent shortage of safe drinking water. Adsorption-based technologies are in the front-line of these efforts. Upon proper design, universally applied materials (e.g., activated carbons, bone chars, metal oxides) are able to quantitatively remove inorganic and organic pollutants as well as pathogens from water. Each water filter has a defined removal capacity and must be replaced when this capacity is exhausted. Operational experience has shown that it may be difficult to convince some low-skilled users to buy new filters after a predicted service life. This communication describes the quest to develop a filter-clock to encourage all users to change their filters after the designed service life. A brief discussion on such a filter-clock based on rusting of metallic iron (Fe0) is presented. Integrating such filter-clocks in the design of water filters is regarded as essential for safeguarding public health.
Article 1 Read 2 Citations Metallic iron for water treatment: leaving the valley of confusion Susanne Makota, Arnaud I. Nde-Tchoupe, Hezron T. Mwakabona, ... Published: 31 July 2017
Applied Water Science, doi: 10.1007/s13201-017-0601-x
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Researchers on metallic iron (Fe0) for environmental remediation and water treatment are walking in a valley of confusion for 25 years. This valley is characterized by the propagation of different beliefs that have resulted from a partial analysis of the Fe0/H2O system as (1) a reductive chemical reaction was considered an electrochemical one and (2) the mass balance of iron has not been really addressed. The partial analysis in turn has been undermining the scientific method while discouraging any real critical argumentation. This communication re-establishes the complex nature of the Fe0/H2O system while recalling that, finally, proper system analysis and chemical thermodynamics are the most confident ways to solve any conflicting situation in Fe0 environmental remediation.
Article 2 Reads 4 Citations Research on metallic iron for environmental remediation: Stopping growing sloppy science Chicgoua Noubactep Published: 01 June 2016
Chemosphere, doi: 10.1016/j.chemosphere.2016.03.088
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Highlights•Packed-beds of metallic iron are a good technology for water treatment.•Fe(0) is mostly regarded as an environmental reducing agent (electron source).•Fe(0) is the electron source only if it oxide scale at its surface is conductive.•On the contrary Fe(II) and H species present within the oxide scale are reducing agents.•Contaminant reduction in Fe(0)/H2O systems is a chemical reaction. AbstractResearch on using metallic iron (Fe(0)) for environmental remediation has boomed during the passed two decades. Achieved results have established filtration on Fe(0) packed beds as an efficient technology for water treatment at several scales. However, the further development of Fe(0)-based filtration systems is impaired by useless discussion on the mechanism of contaminant removal. However, the whole discussion becomes superfleous while properly considering the difference between a chemical and an electrochemical reaction. This note ends the discussion and suggests practical ways to avoid the further propagation of the mistake. Graphical abstract
Article 2 Reads 5 Citations Predicting the Hydraulic Conductivity of Metallic Iron Filters: Modeling Gone Astray Chicgoua Noubactep Published: 20 April 2016
Water, doi: 10.3390/w8040162
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Since its introduction about 25 years ago, metallic iron (Fe0) has shown its potential as the key component of reactive filtration systems for contaminant removal in polluted waters. Technical applications of such systems can be enhanced by numerical simulation of a filter design to improve, e.g., the service time or the minimum permeability of a prospected system to warrant the required output water quality. This communication discusses the relevant input quantities into such a simulation model, illustrates the possible simplifications and identifies the lack of relevant thermodynamic and kinetic data. As a result, necessary steps are outlined that may improve the numerical simulation and, consequently, the technical design of Fe0 filters. Following a general overview on the key reactions in a Fe0 system, the importance of iron corrosion kinetics is illustrated. Iron corrosion kinetics, expressed as a rate constant kiron, determines both the removal rate of contaminants and the average permeability loss of the filter system. While the relevance of a reasonable estimate of kiron is thus obvious, information is scarce. As a conclusion, systematic experiments for the determination of kiron values are suggested to improve the database of this key input parameter to Fe0 filters.
Article 1 Read 2 Citations No Scientific Debate in the Zero-Valent Iron Literature Chicgoua Noubactep Published: 19 January 2016
CLEAN - Soil, Air, Water, doi: 10.1002/clen.201400780
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Since the 1930s, the modern science of aqueous iron corrosion has been established by scientists like J. O'M. Bockris, M. Cohen, U. R. Evans, Y. M. Kolotrykin, G. Okamoto, M. Pourbaix, H. H. Uhlig, or K. J. Vetter. Yet, the electrochemical nature of aqueous iron corrosion is seriously questioned by flawed science. Especially, metallic iron (Fe0) was mistakenly introduced in the 1990s as an environmental reducing agent. Fe0 was then successfully used in subsurface permeable reactive barriers to treat contaminated groundwater. This commentary recalls that observed contaminant degradation/reduction is not the cathodic reaction simultaneous to iron oxidative dissolution. It is concluded that the Fe0 remediation community is working against creativity and innovation.
Article 2 Reads 8 Citations Designing Metallic Iron Packed-Beds for Water Treatment: A Critical Review Chicgoua Noubactep Published: 18 January 2016
CLEAN - Soil, Air, Water, doi: 10.1002/clen.201400304
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Filtration systems based on metallic iron (Fe0 filters) have been successfully used for water treatment over the past two decades. Relevant Fe0 filters expand from subsurface permeable reactive barriers (PRBs) to household filters. Fe0 filters systems are shown efficient for the remediation of biological and chemical contamination. Properly designing a Fe0 filter is finding a long-term balance between two major interdependent design parameters: (i) Fe0 reactivity, and (ii) filter permeability. Other relevant design parameters include (i) aqueous flow velocity, (ii) bed thickness, and (iii) water chemistry. Water chemistry includes nature and extent of contamination. To date, attempts to design more sustainable Fe0 filters have been mostly pragmatic as: (i) reactive Fe0 has failed to be considered as in situ generator of contaminant collectors (and “secondary” reducing agents), and (ii) the volumetric expansive nature of iron corrosion has been overlooked. On the other hand, valuable design criteria were available in the hydrometallurgical literature (cementation using elemental metals) prior to the advent of Fe0 filters. As a consequence the literature is full of seemingly controversial results which are easily conciliated by the physico–chemistry of the system. The present review is limited at identifying some misconceptions and demonstrating their proliferation. Tools for better analyses are recalled. Recent X-ray tomography data are used as illustration of how valuable data are insufficiently discussed. It is hoped that the present contribution will boost systematic research for the design of more sustainable Fe0 filters.