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Adsorption Kinetics and Thermodynamics Study of Butylparaben on Activated Carbon Coconut Based

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Journal of Encapsulation and Adsorption Sciences 2018年第2期8卷 39-57页

作者： Patrick Atheba N’Guadi Blaise Allou Patrick Drogui albert trokourey Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada Laboratoire de Chimie Physique Université Félix Houphou&#235 t Boigny de Cocody-Abidjan Abidjan C&#244 te d’Ivoire Advanced Materials Group Materials Science and Technology Division CSIR-NEIST Jorhat India

In this work, low cost coconut biochar based activated carbon (CBAC) was used for adsorption of Butylparaben (BPB) from aqueous medium. The prepared CBAC was characterized using BET, Boehm analysis and the adsorption equilibrium, kinetics and thermodynamics studies of BPB adsorption were carried out. During batch adsorption runs, the effects of factors, such as contact time (0 - 300 min), CBAC dose (200 - 800 mg), pH (3 - 11) and solution temperatures (303 - 348 K) were investigated on BPB removal. Experimental results reveal that the BPB removal efficiency on CBAC is higher than 97% under acidic and neutral conditions. Equilibrium data were fitted by Langmuir, Freundlich and Temkin isotherm models with correlation coefficient more than 0.9. The pseudo-second order kinetic model was observed to fit well the adsorption data. Thermodynamic analysis shows positive values of standard Gibb’s free energy, suggesting the non-spontaneity of the process. The changes in enthalpy (0.2 ***-1) and entropy (19 ***-1) were found to be endothermic with an increase of randomness. The high adsorption efficiency of the synthesized coconut biochar materials with low cost indicates that it may be a promising adsorbent for removing organic compounds.

关键词： Coconut Shell Activated Carbon Adsorption Butylparaben Kinetics Isotherm

Estimation of Methane Emission from Kossihouen Sanitary Landfill and Its Electricity Generation Potential (Côte d’Ivoire)

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Journal of Power and Energy Engineering 2018年第7期6卷 22-31页

作者： Kouakou Adjoumani Rodrigue Kra Essi Kouadio Marc Cyril trokourey albert Laboratoire de Chimie Physique Université Félix Houphouet-Boigny Abidjan Cote d’Ivoire Laboratoire de Mécanique et des Sciences des Matériaux Institut National Polytechnique Felix Houphouet Boigny (INPHB) Yamous-soukro Cote d’Ivoire

In order to solve the problem of the management of municipal solid waste in Abidjan (Cote d’Ivoire), a sanitary landfill has been designed in Kossihouen. Despite the adverse greenhouse effects of the methane, this gas has a potential of electrical energy. The estimation of methane emissions from the waste can be an economic and useful way for more accurate control and management of waste disposal in Kossihouen. Therefore, conducting this study is essential. Methane emissions were estimated based on the methane generation constant K and the methane generation potential L0 using LandGEM 3.02. The results show that the quantity of methane emissions was 7.97E+07 m3/year. Based on this result, the methane content can generate 10% of total electricity consumed in Abidjan in 2026. This paper could serve as a source of scientific information for decision making on environmental sustainability in waste-to-energy projects in Cote d’Ivoire.

关键词： Methane LandGEM Kossihouen Landfill Gas

Distribution, Mobility, and Health Risks Assessment of Trace Metals in River Sediments from Intense Agricultural Activity Areas in West Africa

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Journal of Materials Science and Chemical Engineering 2024年第8期12卷 12-42页

作者： Ahbeauriet Ahmed Ouattara Maley-Pacôme Soro albert Brou Kouadio Horo Koné albert trokourey Dpartment des Sciences et Technique Universit Alassane Ouattara Bouak Cte dIvoire Laboratoire de Thermodynamique et de Physico-Chimie du Milieu Universit Nangui Abrogoua Abidjan Cte dIvoire Laboratoire de Chimie Physique Universit Flix Houphout Boigny Abidjan Cte dIvoire

The economy of West African countries is mainly based on agriculture. However, the trace metal(loid)s contamination status in rivers is relatively unknown in the region. In this work, 45 surface sediments collected from the Bandama, Comoé, and Bia Rivers in south and south eastern Côte d’Ivoire (West Africa), were analyzed for total metal concentrations and chemical speciation. The results showed that the river sediments were considerably contaminated by Cd and moderately contaminated by As, Cu, Pb, and Zn. Significant spatial variations were observed among the stations but not between the rivers. Metals Cd and Cu were likely to cause more ecological risks. The speciation analysis unravelled that the metal(loid)s partitioned mainly in the residual fraction, with the potential mobile fraction varying from 14% to 28%. The study calls for establishment of strict policies relative to the application of fertilizers and agrochemicals and mining activities to protect the environment and human health risks.

关键词： River Sediment Trace Metal (Loid)s Multivariate Analysis Potential Ecological Risk Assessments Sequential Extraction Geochemical Indices

Inhibition Performance of Some Sulfonylurea on Copper Corrosion in Nitric Acid Solution Evaluated Theoretically by DFT Calculations

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Open Journal of Physical Chemistry 2020年第3期10卷 139-157页

作者： Mougo André Tigori Amadou Kouyaté Victorien Kouakou Paulin Marius Niamien albert trokourey UFR Environnement Université Jean Lorougnon Guédé Daloa C&#244 te d’Ivoire Laboratoire de Chimie Physique Université Félix Houphou&#235 t Boigny Abidjan C&#244 te d’Ivoire

The theoretical study of chlorpropamide, tolazamide and glipizide was carried out by the Density Functional Theory (DFT) at B3LYP/6-31G(d) level. This study made it possible to determine the global reactivity parameters in order to better understand the interactions between the molecules studied and the copper surface. Then, the determination of local reactivity indices (Fukui functions and dual descriptor) on these molecules resulted in the precision on the most probable centers of nucleophilic and electrophilic attacks within each molecule. The results obtained, show that chloropropamide, tolazamide and glipizide can be good inhibitors against copper corrosion. Thus, the mechanism of copper corrosion inhibition of these compounds in nitric acid solution has been explained by means of theoretical calculations.

关键词： Chlorpropamide Tolazamide Glipizide Density Functional Theory Copper Corrosion

Experimental and Theoretical Investigations on Copper Corrosion Inhibition by Cefixime Drug in 1M HNO3Solution

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Journal of Materials Science and Chemical Engineering 2021年第5期9卷 11-28页

作者： N’guessan Yao Silvère Diki Nagnonta Hippolyte Coulibaly Ollo Kambiré albert trokourey Laboratoire de Constitution et Réaction de la Matière UFR SSMT Université Félix Houphou&#235 t-Boigny Abidjan C&#244 te d’Ivoire UFR Sciences et Technologies Université de Man Man C&#244 te d’Ivoire

Cefixime, a third-generation semi-synthetic cephalosporin antibiotic was used as a copper corrosion inhibitor in 1M HNO3 solution. The study was conducted through the weight loss technique at 298 - 318 K and theoretical studies based on quantum chemistry. The studied drug inhibited the corrosion of copper in 1M HNO3 over the cefixime concentration range (0.02 - 2 mM). The inhibition efficiency increased with an increase in the inhibitor concentration to reach 91.07% at 2 mM, but decreased with an increase in temperature. The thermodynamic functions related to the adsorption of cefixime on the copper surface and that of the metal dissolution were computed and analyzed. The results point out spontaneous adsorption, mainly through a physisorption mechanism following Langmuir adsorption isotherm model and an endothermic dissolution process. Quantum chemical calculations were also performed at B3LYP level with 6-31G (d, p) basis set and lead to molecular descriptors such as EHOMO (energy of the highest occupied molecular orbital), ELUMO (energy of the lowest unoccupied molecular orbital), ΔE (energy gap) and μ (dipole moment). The global reactivity descriptors such as χ (electronegativity), χ (global hardness), S (global softness), and ω (electrophilicity index) were derived using Koopman’s theorem and analyzed. The local reactivity parameters, including Fukui functions and dual descriptors were determined and discussed. Experimental and theoretical results were found to be in good agreement.

关键词： Cefixime Corrosion Langmuir Quantum Chemistry Weight Loss

Nicotinamide Inhibition Properties for Copper Corrosion in 3.5% NaCl Solution: Experimental and Theorical Investigations

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Journal of Materials Science and Chemical Engineering 2018年第3期6卷 100-121页

作者： Coulibaly Nagnonta Hippolyte Brou Yapi Serge Akpa Sagne Juan Creus trokourey albert Laboratoire de Chimie Physique (LCP) Université Félix Houphouet-Boigny d’Abidjan Abidjan Cote d’Ivoire Laboratoire de Chimie Organique et de Substances Naturelles (LCOSN) Université Félix Houphouet-Boigny d’Abidjan Abidjan Cote d’Ivoire Laboratoire des Sciences de l’Ingénieur pour l’Environnement (LaSIE) Université de La Rochelle La Rochelle France

This work reports the inhibition properties of nicotinamide (NAM) for copper protection during its applications in seawater systems such as water pipelines, shipbuilding, seawater desalination and heat exchange systems. The efficiency of NAM as a copper corrosion inhibitor in simulated seawater (3.5% NaCl solution) was investigated by Tafel extrapolation and linear polarization methods in the temperature range from 20℃ to 50℃. The corrosion parameters and the adsorption isotherms were determined using potentiodynamic polarization techniques. It was found that the inhibition efficiency (η) and the coverage rate (θ) increase up 80% at 25℃ for nicotinamide concentration of 10 mM but decrease as the temperature of the solution increases. Moreover, the obtained thermodynamic parameters using Langmuir model suggested a physical adsorption type. A correlation was found between the corrosion inhibition efficiency and the global theoretical parameters obtained by the functional density method B3LYP/ 6-31 + G (d, p). Local parameters such as condensed Fukui functions [f(r)] and condensed local softness [s(r)] indices have also been determined to obtain a chemical insight into atoms that have a significant tendency toward donation or acceptance of whole or fraction of electrons.

关键词： Nicotinamide Copper Corrosion Inhibition Electrochemical Techniques

Biochemical Methane Potential of Food Wastes from Akouedo Landfill, Côte d’Ivoire

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Green and Sustainable Chemistry 2018年第3期8卷 288-293页

作者： Kouadio Marc Cyril Kouakou Adjoumani Rodrigue Kra Essi trokourey albert Akichi Agboue Laboratoire de Chimie Physique Université Félix Houphou&euml t Boigny Abidjan C&ocirc te d’Ivoire Laboratoire de mécanique et des sciences des matériaux Institut National Polytechniques Felix Houphou&euml t Boigny (INPHB) Yamoussoukro C&ocirc te d’Ivoire

The determination of biochemical methane potential (BMP) is very important for the valorization of food wastes. This study is focused on the evaluation of the theoretical methane production from chemical oxygen demand (COD) of some food wastes, coming out Akouedo landfill. Almost all of the considered samples exhibited methane theoretical yields equal to about 402.5 - 507.8 mLCH4/gVS. These results indicate the suitability of all the studied food wastes from Akouedo landfill to be converted into energy.

关键词： Biochemical Methane Potential Food Wastes Akouedo Landfill Chemical Oxygen Demand

Preparation and Characterization of Activated Carbon Based on Wood (Acacia auriculeaformis, Côte d’Ivoire)

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Journal of Encapsulation and Adsorption Sciences 2019年第2期9卷 63-82页

作者： Drissa Ouattara Kra N’guadi Blaise Allou Patrick Atheba Patrick Drogui albert trokourey Laboratoire de Chimie Physique Université Félix Houphou&euml t Boigny de Cocody-Abidjan Abidjan C&ocirc te d’Ivoire Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada

The objective of this work is to prepare one of the best activated carbon (CA) based on wood (Acacia auriculeaformis). The chemical activation method was used for varying the chemical agent namely phosphoric acid H3PO4 (CAA), sodium hydroxide NaOH (CAB), and sodium chloride NaCl (CAS). The physico-chemical analysis of the three activated carbons indicated that, under the conditions of preparation, the activated carbons possess activation efficiencies lower than 50% (41.81% for CAA, 26.25% for CAB and 48.87% for CAS), low ash content (CAA: 5.00%, CAB: 14.90 and CAS: 6.60%) and iodine values ranging from 190.35 mg/g to 380.71 mg/g, suggesting that the good quality of the prepared activated carbon. The surface functional groups using Boehm test and the zero point charge (pHZPC) methods confirmed the acidic, basic and neutral character for CAA, CAB and CAS respectively (CAA: pHZPC = 4.8, CAB: pHZPC = 8.2, CAS: pHZPC = 6.8). The surface specific areas were determined through the liquid phase adsorption of acetic acid and methylene blue using the Langmuir method and BET analysis. Also, the porosity was determined. The BET surface areas of CAA, CAB and CAS were respectively 561.60 m2/g, 265.00 m2/g and 395.40 m2/g. The influence of chemical activation agent on pores formation was confirmed by scanning electron microscopic (SEM) analysis. CAA was selected as the best activated carbon because of its good surface area and good pore volume compared to those found in the literature. Therefore, its application as an adsorbent for effluents treatment could be explored. In addition, the best activating agent for coal from Acacia auriculeaformis was found to be phosphoric acid.

关键词： Activated Carbon Acacia auriculeaformis Chemical Activation Phosphoric Acid Sodium Hydroxide Sodium Chloride

Photocatalytic Degradation of Paraquat Herbicide Using a Fixed Bed Reactor Containing TiO2Nanoparticles Coated onto β-SiCAlveolar Foams

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American Journal of Analytical Chemistry 2019年第5期10卷 171-184页

作者： Ignace Christian M’Bra Grah Patrick Atheba Didier Robert Patrick Drogui albert trokourey Institut de Chimie et Procédés pour l’Energie l’Environnement et la Santé (ICPEES) CNRS-UMR7515 Université de Stras-bourg antenne de Saint-Avold Université de Lorraine Saint-Avold France Laboratoire de Chimie Physique UFR Sciences des Structures de la Matière et de la Technologie (SSMT) Université Félix Houphou&#235 t Boigny d’Abidjan C&#244 te d’Ivoire Institut National de la Recherche Scientifique (INRS-Eau Terre et environnement) Université du Québec Québec Canada

Photocatalytic degradation of paraquat (PQ) aqueous solutions was studied in a fixed bed photoreactor under UV irradiation at 368 nm. This contained β-SiC alveolar foams coated with TiO2 P25 by dip-coating method. SEM analyses revealed that the surface of the film did not exhibit cracks in the presence of TTIP as a binder in the TiO2 P25 suspension. The following parameters were studied in continuous mode operation: the flow rate in the reactor, the initial concentration of the paraquat, the pH of the solution, the weight of photocatalytic material with the number of foams in the reactor and the weight of the catalyst deposited onto the support. The results showed that by working under optimal operating conditions at natural pH (pH = 6.7), low paraquat (Co = 10 ppm), and flow (26 mL/min), we recorded approximately (43.16 ± 1.00)% oxidation of paraquat and a decrease in total organic carbon (TOC) of (27.13 ± 1.00)% after about 70 minutes. The apparent rate constant is in the order of (0.0656 ± 0.0010) min-1. In addition, by increasing the amount of β-SiC foams coated with TiO2, we improve the degradation of paraquat in the same order. The study of aging of the material showed its stability over time. However, photocatalytic activity was limited after 20 minutes of UV irradiation due to the limitation of the diffusion of the paraquat molecules towards the surface of the photocatalyst. As an outcome, we obtained an efficient TiO2/β-SiC material for photocatalytic degradation of organic compounds in water.

关键词： Photocatalytic Degradation Paraquat β-SiC Foam TiO2 P25 Water