CI
Maître de Conférences
Activité scientifique
Profil chercheur
Enseignant-chercheur à l’Université de Yaoundé I. Grade : Maître de Conférences.
Publications scientifiques
Germain Dionmbete, Jean-Baptiste Tarkwa, Franck William Tatchemo Boyom, Serge Nzali, Elie Acayanka, Georges Y. Kamgang
Plasma Chemistry and Plasma Processing
Elie Acayanka, Jean-Baptiste Tarkwa, Emilie Lucresse N. Nguetcha, Line N. Leundjeu, Franck William Tatchemo Boyom, Georges Y. Kamgang
Journal of Water Process Engineering
Suzie Anne Voufouo, Jean-Baptiste Tarkwa, Elie Acayanka, Wilfrid Fokoue Fokou, Franck W. Boyom‐Tatchemo, Georges Y. Kamgang
BioNanoScience
Nehemie Miloh, Jean-Baptiste Tarkwa, Berthelot Sop-Tamo, Claude F. G. Mbafou, Patrick M. Kouotou, Elie Acayanka et 1 autre(s)
Journal of Water Chemistry and Technology
A self-floating amphiphilic biosorbent (SFAB) was prepared by dispersing the plasma-modified water hyacinth (WH) (Eichhornia crassipes) fibers on the beeswax support. The synthesis process takes advantage of the functionalising properties of plasma with polar groups (–OH, –CO, –COOH) and the binding effect of beeswax. The characteristics of the obtained biosorbent exhibited significant changes in surface chemistry and roughness confirmed by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and energy dispersive X-ray spectroscopy (EDX). The resulting functionalised material offers appropriate anchoring sites for pollutants leading to a biomaterial with hydrophilic and lipophilic properties. The removal performance of the SFAB outperforms the natural biomass fibers taking alone, with an uptake capacity of 20.83 mg/g for merbromin (MB) (50 mg/L) and 19.90 mg/g for Green Naphthol B (GNB) (50 mg/L), based on the successfully fitted general-order kinetic model. The effects of some key adsorption parameters were optimised, and the equilibrium data (298–323 K) were best fitted by the Liu isotherm reaching 47.20 and 36.40 mg/g of uptake amounts for MB and GNB, respectively at 298 K. The removal mechanism is governed by π–π interplay, hydrophobic interaction, and hydrogen bonding effects.
Germain Dionmbete, Nehemie Miloh, Jean-Baptiste Tarkwa, Elie Acayanka, Albert Brandt Poupi Mbouopda, Franck W. Boyom‐Tatchemo et 1 autre(s)
Biomass Conversion and Biorefinery
Claude F. G. Mbafou, Brice Takam, Franck W. Boyom‐Tatchemo, Jean-Baptiste Tarkwa, Elie Acayanka, Georges Y. Kamgang et 2 autre(s)
Environmental Science and Pollution Research
Chesseu M. Darryle, Elie Acayanka, Brice Takam, Leundjeu N. Line, Georges Y. Kamgang, Samuel Laminsi et 2 autre(s)
Journal of Water Process Engineering
Brice Takam, Jean-Baptiste Tarkwa, Elie Acayanka, Serge Nzali, Darryle M. Chesseu, Georges Y. Kamgang et 1 autre(s)
Environmental Science and Pollution Research
Elie Acayanka, Jean-Baptiste Tarkwa, Brice Takam, Daouda Abia, Serge Nzali, Georges Y. Kamgang et 1 autre(s)
Mini-Reviews in Organic Chemistry
In their search for an alternative to commercial adsorbents, much research is turned to the local biomass-based materials such as agricultural residues and assimilated derivatives. However, natural biomass due to its low specific surface area must first undergo several pre-treatments. Among the newly emerging electric techniques for environmental applications, those who operate at atmospheric pressure (Non-thermal plasma) have recently found many breakthrough applications arising from their easy use with no extra additional reagents and their high reactivity. The Non-thermal plasma treatment of biomass is one of the promising developed approaches mainly due to significant effects including the formation of micro and macrospores, the increase of surface roughness, and surface functionalization. The most used plasma is non-thermal, so as not to denature the biomass, likewise the hot plasma can burn and/or destroy high contains carbon biomaterials. Especially, the gliding arc plasma obtained using moisten air as feeding gas, which is known to induce acidifying and oxidizing effects in an aqueous target. The primary species HO• radicals [E° (HO•/H 2 O) = 2.85 V/SHE] mainly formed in the arc will be with the dimer H 2 O 2 [E°(H 2 O 2 /H 2 O) = 1.76 V/SHE] the determining agents for the chemical reactions induced. Exposure of a target to this kind of environment is likely to promote great surface transformations. This approach has some advantages: (i) the merit of not using commercial chemical reagents, the reactive species being in situ generated; (ii) the risks related to the manipulation of the products, the plasma reactor is robust and can be modulated to treat large quantity; (iii) the efficiency of the bi-functionality of the plasma (acidifier and oxidative). In this review, we will highlight the main changes induced by exposure of biomass to plasma treatment and also make a comparative study between chemically and plasma-activated materials in the removal of various pollutants from aqueous solution; and finally, we summarize the findings in the existing literature.
Elie Acayanka, Jean-Baptiste Tarkwa, Katia Nchimi Nono, Suzie Anne Voufouo, Antoine Tiya-Djowe, Georges Y. Kamgang et 1 autre(s)
Surfaces and Interfaces
Albert Poupi Mbouopda, Elie Acayanka, Serge Nzali, Georges Y. Kamgang, Estella B. Njoyim Tamungang, Samuel Laminsi et 1 autre(s)
Desalination and Water Treatment
Brice Takam, Elie Acayanka, Georges Y. Kamgang, Merlin T. Pedekwang, Samuel Laminsi
Environmental Science and Pollution Research
Albert Poupi Mbouopda, Elie Acayanka, Franck W. Boyom‐Tatchemo, Georges Y. Kamgang, A.M. Nzeufa, Samuel Laminsi et 1 autre(s)
Materials Chemistry and Physics
Elie Acayanka, Duclair S. kuete, Georges Y. Kamgang, Serge Nzali, Samuel Laminsi, Peter T. Ndifon
Plasma Chemistry and Plasma Processing
Daouda Abia, Serge Nzali, Elie Acayanka, Georges Y. Kamgang, Samuel Laminsi, P.M. Ghogomu
Journal of Industrial and Engineering Chemistry
Moïse Fouodjouo, Samuel Laminsi, Georges Y. Kamgang, Michele T. Mengue, Nito Ângelo Debacher
Journal of the Brazilian Chemical Society
The present work focused on the mineralization of herbicide glyphosate (N-(phosphonomethyl) glycine) (C3H8NO5P) in aqueous phase by Glidarc plasma following the orthophosphates released and the reduction of the total organic carbon (TOC). Furthermore, the effect of initial concentration, pH and the degradation process of glyphosate in the presence of Fe2+ were also examined. The results showed that the efficiency of degradation increased with the presence of ferrous ions as catalysts in aqueous medium and also the release of orthophosphate is more efficient in acid medium with pH range of 3.5-6.3. The kinetics of the release of orthophosphate and the TOC removal obey the first order rate law. The ninhydrin and orthophosphates tests showed that the degradation of glyphosate in water by Glidarc plasma was mainly by OH and NO attacked with C–N and C–P bond cleavage leading to complete mineralization.
Murielle Naïtali, Jean‐Marie Herry, Eugen Hnatiuc, Georges Y. Kamgang, Jean‐Louis Brisset
Plasma Chemistry and Plasma Processing
Nehemie Miloh, Verdiane K. Kengne, Elie Acayanka, Patrick M. Kouotou, Georges Y. Kamgang
Water Air & Soil Pollution
Jean-Baptiste Tarkwa, Elie Acayanka, Bo Jiang, Nihal Oturan, Georges Y. Kamgang, Samuel Laminsi et 1 autre(s)
Applied Catalysis B: Environmental
Moïse Fouodjouo, Samuel Laminsi, Georges Y. Kamgang, Michele T. Mengue, Nito Ângelo Debacher
Figshare
The present work focused on the mineralization of herbicide glyphosate (N-(phosphonomethyl) glycine) (C3H8NO5P) in aqueous phase by Glidarc plasma following the orthophosphates released and the reduction of the total organic carbon (TOC). Furthermore, the effect of initial concentration, pH and the degradation process of glyphosate in the presence of Fe2+ were also examined. The results showed that the efficiency of degradation increased with the presence of ferrous ions as catalysts in aqueous medium and also the release of orthophosphate is more efficient in acid medium with pH range of 3.5-6.3. The kinetics of the release of orthophosphate and the TOC removal obey the first order rate law. The ninhydrin and orthophosphates tests showed that the degradation of glyphosate in water by Glidarc plasma was mainly by OH and NO attacked with C–N and C–P bond cleavage leading to complete mineralization.
Profil chercheur
Publications scientifiques
3 publications
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Collaborations
