Noubactep, Chicgoua

[["dc.bibliographiccitation.firstpage","528"],["dc.bibliographiccitation.journal","Chemosphere"],["dc.bibliographiccitation.lastpage","530"],["dc.bibliographiccitation.volume","153"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2018-11-07T10:13:54Z"],["dc.date.available","2018-11-07T10:13:54Z"],["dc.date.issued","2016"],["dc.description.abstract","Research 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. (C) 2016 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.chemosphere.2016.03.088"],["dc.identifier.isi","000375628800061"],["dc.identifier.pmid","27037660"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40515"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1879-1298"],["dc.relation.issn","0045-6535"],["dc.title","Research on metallic iron for environmental remediation: Stopping growing sloppy science"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2085"],["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","Water"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Pembe-Ali, Zuleikha"],["dc.contributor.author","Mwamila, Tulinave Burton"],["dc.contributor.author","Lufingo, Mesia"],["dc.contributor.author","Gwenzi, Willis"],["dc.contributor.author","Marwa, Janeth"],["dc.contributor.author","Rwiza, Mwemezi J."],["dc.contributor.author","Lugodisha, Innocent"],["dc.contributor.author","Qi, Qinwen"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2021-09-01T06:43:01Z"],["dc.date.available","2021-09-01T06:43:01Z"],["dc.date.issued","2021"],["dc.description.abstract","There is escalating salinity levels on small islands due to uncontrolled groundwater extraction. Conventionally, this challenge is addressed by adopting optimal groundwater pumping strategies. Currently, on Unguja Island (Zanzibar), urban freshwater is supplied by desalination, which is expensive and energy-intensive. Hence, desalinization cannot be afforded by rural communities. This study demonstrates that the innovative Kilimanjaro Concept (KC), based on rainwater harvesting (RWH) can remediate seawater intrusion in Unguja, while enabling a universal safe drinking water supply. The reasoning is rooted in the water balance of the whole island. It is shown that if rainwater is systematically harvested, quantitatively stored, and partly infiltrated, seawater intrusion will be reversed, and a universal safe drinking water supply will be secured. Water treatment with affordable technologies (e.g., filtration and adsorption) is suggested. The universality of KC and its suitability for small islands is demonstrated. Future research should focus on pilot testing of this concept on Unguja Island and other island nations."],["dc.description.abstract","There is escalating salinity levels on small islands due to uncontrolled groundwater extraction. Conventionally, this challenge is addressed by adopting optimal groundwater pumping strategies. Currently, on Unguja Island (Zanzibar), urban freshwater is supplied by desalination, which is expensive and energy-intensive. Hence, desalinization cannot be afforded by rural communities. This study demonstrates that the innovative Kilimanjaro Concept (KC), based on rainwater harvesting (RWH) can remediate seawater intrusion in Unguja, while enabling a universal safe drinking water supply. The reasoning is rooted in the water balance of the whole island. It is shown that if rainwater is systematically harvested, quantitatively stored, and partly infiltrated, seawater intrusion will be reversed, and a universal safe drinking water supply will be secured. Water treatment with affordable technologies (e.g., filtration and adsorption) is suggested. The universality of KC and its suitability for small islands is demonstrated. Future research should focus on pilot testing of this concept on Unguja Island and other island nations."],["dc.identifier.doi","10.3390/w13152085"],["dc.identifier.pii","w13152085"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/89201"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-455"],["dc.relation.eissn","2073-4441"],["dc.title","Application of the Kilimanjaro Concept in Reversing Seawater Intrusion and Securing Water Supply in Zanzibar, Tanzania"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2953"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","FRESENIUS ENVIRONMENTAL BULLETIN"],["dc.bibliographiccitation.lastpage","2957"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Kobbe-Dama, Nathalie"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.contributor.author","Tchatchueng, Jean-Bosco"],["dc.date.accessioned","2018-11-07T09:29:29Z"],["dc.date.available","2018-11-07T09:29:29Z"],["dc.date.issued","2013"],["dc.description.abstract","The technology of using metallic iron (Fe-0) particles for water treatment is now 20 years old. In it original form, millimetre (mm Fe-0) and micrometer (mu m Fe-0) particles were used. This conventional material has been modified for efficiency improvement. Relevant modifications included: (i) reducing the particle size down to nano-dimensions (nm Fe-0), (ii) alloying Fe-0 with a second/third metallic element to generate bimetallic/trimetallic systems (e.g. Fe-0/Pd-0), (iii) mixing conventional Fe-0 with redox-active components like granular activated carbon, MnO2, Fe3O4, (iv) adding external Fe-II to Fe-0/H2O systems, and (v) using some combinations of tools (i) though (iv) (e.g. Fe-II/Fe3O4/Fe-0, nano Fe-0/Pd-0). Other metallic elements (e.g. Al-0, Mg-0, Zn-0) have also been tested. A critical look behind the mechanism of involved processes in Fe-0/H2O systems reveals that made modifications accelerate iron corrosion, and thus the production of secondary reducing agents (Fe-II, H/H-2). The net result is that the electrochemical Fe corrosion is not necessarily simultaneous to well-documented contaminant reduction. The research community has not yet considered this evidence as Fe-0 is still presented as an environmental reducing agent. The present article clarifies this key issue."],["dc.identifier.isi","000327108000021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31043"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1610-2304"],["dc.relation.issn","1018-4619"],["dc.title","METALLIC IRON FOR WATER TREATMENT: PREVAILING PARADIGM HINDERS PROGRESS"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","481"],["dc.bibliographiccitation.journal","Chemical Engineering Journal"],["dc.bibliographiccitation.lastpage","491"],["dc.bibliographiccitation.volume","259"],["dc.contributor.author","Phukan, Meghalim"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2018-11-07T10:04:19Z"],["dc.date.available","2018-11-07T10:04:19Z"],["dc.date.issued","2015"],["dc.description.abstract","The effect of the ionic charge on the efficiency of Fe-0/sand systems for dye discoloration was investigated in column studies. Tested systems for each dye were: (i) pure sand (0% Fe-0), (ii) pure Fe-0 (100% Fe-0), and (iii) Fe-0/sand (50% Fe-0 - vol/vol). Tested dyes were methylene blue (MB - cationic), Orange II (anionic) and reactive red 120 (RR 120 - anionic). Used dye concentration was 31 mu M and used Fe-0 mass was 100g. Each system was characterized by the time-dependent changes of the pH value, the iron breakthrough, the dye breakthrough, and the hydraulic conductivity (permeability). The experiments lasted for 93 days during which a total of 26.12 L of the dye solution flowed through each column (809.7 mu M dye in total). No significance changes in pH value, Fe breakthrough and permeability could be documented. In pure sand systems (0% Fe-0) 15, 21 and 140 mu M of RR 120, Orange II and MB were discolored respectively. The discoloration efficiency in Fe-0-based systems was 75% for MB and more than 95% for RR120 and Orange II. Results confirmed quantitative adsorptive MB discoloration and negligible adsorption of anionic dyes onto negatively charged sand. Quantitative discoloration of anionic dyes (Orange II, RR 120) in Fe-0/sand systems was attributed to high affinities of both species to positively iron corrosion products. UV-vis spectra of effluent solutions revealed a quantitative chemical reaction of RR 120 in the Fe-0/H2O system. The yellow-colored reaction products were not active in the range 800-200 nm and their breakthroughs were quantitative over the whole experimental duration. Results confirmed the ion-selective nature of the Fe-0/H2O system and are regarded as a cornerstone for the design of next generation Fe-0-based filtration systems. (C) 2014 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","German Ministry for Environment (BMU) [0325417]"],["dc.identifier.doi","10.1016/j.cej.2014.08.013"],["dc.identifier.isi","000343952400051"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38670"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1873-3212"],["dc.relation.issn","1385-8947"],["dc.title","Characterizing the ion-selective nature of Fe-0-based filters using azo dyes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","663"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Water SA"],["dc.bibliographiccitation.lastpage","670"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Noubactep, C."],["dc.date.accessioned","2018-11-07T08:39:03Z"],["dc.date.available","2018-11-07T08:39:03Z"],["dc.date.issued","2010"],["dc.description.abstract","Contaminant co-precipitation with continuously generated and transformed iron corrosion products has received relatively little attention in comparison to other possible removal mechanisms (adsorption, oxidation, precipitation) in Fe(0)/H(2)O systems at near neutral pH values. A primary reason for this is that the use of elemental iron (Fe(0)) in environmental remediation is based on the thermodynamic-founded premise that reducible contaminants are potentially reduced while Fe(0) is oxidised. However, co-precipitation portends to be of fundamental importance for the process of contaminant removal in Fe(0)/H(2)O systems, as the successful removal of bacteria, viruses and non reducible organic (e.g. methylene blue, triazoles) and inorganic (e.g. Zn) compounds has been reported. This later consideration has led to a search for the reasons why the importance of co-precipitation has almost been overlooked for more than a decade. Three major reasons have been identified: the improper consideration of the huge literature of iron corrosion by pioneer works, yielding to propagation of misconceptions in the iron technology literature; the improper consideration of available results from other branches of environmental science (e.g. CO(2) corrosion, electrocoagulation using Fe(0) electrodes, Fe or Mn geochemistry); and the use of inappropriate experimental procedures (in particular, mixing operations). The present paper demonstrates that contaminant co-precipitation with iron corrosion products is the fundamental mechanism of contaminant removal in Fe(0)/H(2)O systems. Therefore, the 'iron technology' as a whole is to be revisited as the 'know-why' of contaminant removal is yet to be properly addressed."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [626/2-2]"],["dc.identifier.isi","000283838500016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18895"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Water Research Commission"],["dc.relation.issn","0378-4738"],["dc.title","The fundamental mechanism of aqueous contaminant removal by metallic iron"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","353"],["dc.bibliographiccitation.journal","Chemical Engineering Journal"],["dc.bibliographiccitation.lastpage","362"],["dc.bibliographiccitation.volume","279"],["dc.contributor.author","Tepong-Tsinde, Raoul"],["dc.contributor.author","Phukan, Meghalim"],["dc.contributor.author","Nassi, Achille"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.contributor.author","Ruppert, Hans"],["dc.date.accessioned","2018-11-07T09:49:58Z"],["dc.date.available","2018-11-07T09:49:58Z"],["dc.date.issued","2015"],["dc.description.abstract","The effect of the chloride ions (Cl-) on the efficiency of Fe-0/sand systems for methylene blue (MB) discoloration was characterized in column studies for 4 months. Tested systems were: pure sand (0% Fe-0 reference) and Fe-0/sand (50% Fe-0-vol/vol). Tested Cl- concentrations were 0.0, 2.1, 21.1 and 42.2 mM. The used MB concentration was 16 mu M (5 mg L-1) and used Fe-0 mass was 100g. Discoloration experiments lasted for 89 days and was followed by a 26 days desorption experiment. Each system was characterized by the time-dependent changes of the pH value, the iron breakthrough, the MB breakthrough, and the hydraulic conductivity (permeability). During the discoloration experiments, a total of 17.4 L (184 pore volumes) of the MB solution flowed through each column (279.0 mu M dye or 87.2 mg). No significance changes in pH value and permeability could be documented. Discoloration and desorption results confirmed that sand is an excellent MB adsorbent (only 11% desorption in the reference system). In the absence of Cl-, 15 mg MB was discolored. Up to 18 mg of MB was discolored in the presence of Cl-. The same trend was observed in changes of the extent of iron release which was 7.3 mg at 0.0 mM Cl- and 16.2 mg at 42.2 mM Cl-. These results confirm that chloride ions enhance the kinetics of Fe-0 corrosion and thus the production of contaminant collectors (for MB co-precipitation). Results confirmed the suitability of MB as a powerful operative indicator for the characterization of processes in the Fe-0/H2O system. (C) 2015 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.cej.2015.04.129"],["dc.identifier.isi","000359873500040"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35612"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1873-3212"],["dc.relation.issn","1385-8947"],["dc.title","Validating the efficiency of the MB discoloration method for the characterization of Fe-0/H2O systems using accelerated corrosion by chloride ions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4569"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Fresenius Environmental Bulletin"],["dc.bibliographiccitation.lastpage","4577"],["dc.bibliographiccitation.volume","25"],["dc.contributor.author","Boroomand, Borhaneddin"],["dc.contributor.author","Vafaii, Fereydun"],["dc.contributor.author","Bahrololoom, Mohammad Ebrahim"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2018-11-07T10:19:44Z"],["dc.date.available","2018-11-07T10:19:44Z"],["dc.date.issued","2016"],["dc.description.abstract","This study tested the suitability of willow leaves as a biological sorbent for the removal of copper ions (Cu2+) from industrial effluents. Bath mode was used and the effects of the following parameters were investigated: adsorbent dosage (10 to 50 g/L), pH value (2.6 to 8.0), adsorbent particle size (non-crushed and powder) and equilibration time (5 to 120 minutes). The leaves were characterized by Fourier transform infrared spectroscopy (FTIR) before and after Cu2+ adsorption. The results revealed a higher efficiency of powdered adsorbents for Cu2+ removal. The highest adsorption efficiency was found to occur at pH 4.6 with 50 g/L powdered leaves for an experimental duration of 2 hours. The results of FTIR study revealed the presence of salicylic acid (in addition to cellulose) in willow leaves. These derivatives are probably responsible for Cu2+ chemical adsorption. Willow leaves were found to be an efficient and affordable adsorbent for wastewater treatment."],["dc.identifier.isi","000390641900013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41724"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.eissn","1018-4619"],["dc.relation.issn","1610-2304"],["dc.title","TESTING WILLOW LEAVES FOR THE REMOVAL OF Cu2+ FROM AQUEOUS EFFLUENTS"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","S0045653521033853"],["dc.bibliographiccitation.firstpage","132913"],["dc.bibliographiccitation.journal","Chemosphere"],["dc.bibliographiccitation.volume","291"],["dc.contributor.author","Konadu-Amoah, Bernard"],["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","2022-04-01T10:00:59Z"],["dc.date.available","2022-04-01T10:00:59Z"],["dc.date.issued","2022"],["dc.identifier.doi","10.1016/j.chemosphere.2021.132913"],["dc.identifier.pii","S0045653521033853"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/105568"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-530"],["dc.relation.issn","0045-6535"],["dc.rights.uri","https://www.elsevier.com/tdm/userlicense/1.0/"],["dc.title","Investigating the Fe0/H2O systems using the methylene blue method: Validity, applications, and future directions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","411"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","CLEAN - Soil Air Water"],["dc.bibliographiccitation.lastpage","421"],["dc.bibliographiccitation.volume","44"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.date.accessioned","2018-11-07T10:15:59Z"],["dc.date.available","2018-11-07T10:15:59Z"],["dc.date.issued","2016"],["dc.description.abstract","Filtration systems based on metallic iron (Fe-0 filters) have been successfully used for water treatment over the past two decades. Relevant Fe-0 filters expand from subsurface permeable reactive barriers (PRBs) to household filters. Fe-0 filters systems are shown efficient for the remediation of biological and chemical contamination. Properly designing a Fe-0 filter is finding a long-term balance between two major interdependent design parameters: (i) Fe-0 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 Fe-0 filters have been mostly pragmatic as: (i) reactive Fe-0 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 Fe-0 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 Fe-0 filters."],["dc.identifier.doi","10.1002/clen.201400304"],["dc.identifier.isi","000374541500011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40942"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1863-0669"],["dc.relation.issn","1863-0650"],["dc.title","Designing Metallic Iron Packed-Beds for Water Treatment: A Critical Review"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","365"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Carbon"],["dc.bibliographiccitation.lastpage","369"],["dc.bibliographiccitation.volume","35"],["dc.contributor.author","Avom, J."],["dc.contributor.author","Mbadcam, J. Ketcha"],["dc.contributor.author","Noubactep, Chicgoua"],["dc.contributor.author","Germain, P."],["dc.date.accessioned","2020-05-06T12:03:02Z"],["dc.date.available","2020-05-06T12:03:02Z"],["dc.date.issued","1997"],["dc.description.abstract","The adsorption of a ca. 5.4 x10-5 M aqueous solution of methylene blue has been examined on five activated carbon samples. The equilibrium concentrations (C,) were determined by spectrophotometry studies. The analysis of Freundlich adsorption isotherms obtained provides the adsorption capacity of each carbon sample."],["dc.identifier.doi","10.1016/S0008-6223(96)00158-3"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/64908"],["dc.language.iso","en"],["dc.relation.issn","0008-6223"],["dc.title","Adsorption of methylene blue from an aqueous solution on to activated carbons from palm-tree cobs"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dspace.entity.type","Publication"]]