Publications Scientifiques

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End date: 2019Subject: search.filters.subject.Characterization

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    Characterization of used engine oil and possibility of recovery
    (2018) Zerdane, Youghourta; Hachemi, M.; Tazrout, M.; Largeau, Jean-François
    The world today is facing major energy and climate challenges. The growth of global energy demand, the decline in fossil reserves and the dangerous disruption of the climate caused by pollution compels states and scientists to quickly adopt plans strengthened action on renewable energies and the treatment of different types of waste generated by human activity, such as used motor oils in order to preserve the environment and to find other sustainable and economically viable solutions. This work, based on a characterization study of used motor oil, has shown that these characteristics deteriorate after a certain time of use compared to a new oil and that they become polluting due to contamination by inorganic elements (metal). The high calorific value of the used oil can be considered as an important source of energy, hence the need to develop a process for the upgrading of this waste and for this purpose it is envisaged to explore later one of these ways which is pyrolysis
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    Study of the adsorption of methylene blue by natural materials (olive stone, date pit and their mixture) in fixed bed column
    (ALJEST, 2019) Abed, Fatma; Aksa, H.; Abai, N.; Babakhouya, N.
    The present study focuses on the recovery of two agro-food waste available in our country with significant quantities olive pomace and date pits for the removal of a synthetic dye which is methylene blue. Both materials were used in their native forms separated and mixed to improve their adsorptive capacity. A range of physico-chemical analysis was performed to characterize adsorbents used, among them: the FTIR spectroscopy and the scanning electron microscopy. The ability of adsorbents prepared to adsorbe methylene blue (MB) from the aqueous solution was investigated in a fixed bed column. The effects of several important parameters were studied, such as initial concentration of MB, flow rate and bed height. The corresponding breakthrough curves were calculated.
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    Application of Fourier Transform Infrared (FT-IR) Spectroscopy to the Study of the Modification of Epoxidized Sunflower Oil by Acrylation
    (Sage journals, 2012) Irinislimane, Ratiba; Belhaneche-Bensemra, Naima
    Commercial sunflower oil was epoxidized at the laboratory-scale. The epoxidized sunflower oil (ESFO) was modified following the acrylation reaction. Modification was carried out simultaneously using acrylic acid (AA) and triethylamine (TEA). To optimize the reaction conditions, the effects of four temperatures (40, 60, 80, and 100 °C), the ESFO:AA (100:100) ratio, and 0.2% TEA were investigated. The rate of conversion was analyzed with both FT-IR and titration of the oxirane ring. After that, the temperature with the highest conversion was selected and used throughout for all modification reactions. Then, four ratios (100:100, 100:90, 100:80, and 100:75) of ESFO:AA were analyzed at four different concentrations of TEA (0.2, 0.3, 0.4, and 0.5%) to determine the best estimate for both the ESFO:AA ratio and the catalyst concentration. Conversion rate was analyzed using FT-IR spectroscopy by measuring the concentrations of ester, carbonyl, and alcohol groups. Moreover, oxirane***ring concentration was estimated using the titration method (with gentian violet as indicator) and FT-IR spectroscopy (epoxy ring absorptions at 1270 cm−1 and 877 cm−1). Based on conversion yield, the optimum ESFO:AA ratio corresponds to 100:80; the best temperature reaction was at 60 °C, and the best TEA concentration was 0.2%. The critical amounts of reactants needed to reach maximum conversion were established. The final acid value of the acrylated ESFO after washing (pH = 7) was 2.1 mg potassium hydroxide (KOH) g−1. All results show that FT-IR spectroscopy is a simple, low-cost, rapid method for investigating the kinetics of a reaction
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    Activation et caractérisation d‘une zéolithe HY utilisée en qualité d’adsorbant
    (Aljest, 2018) Cherifi-Naci, Halima
    L’article traite la préparation des matériaux zéolithiques activés dotés d’un pouvoir adsorbant très important dans le domaine de l’environnement. Nous avons procédé à la caractérisation physico-chimique et à la détermination des conditions optimales d’Activation (Concentration : 5M à la température T=90°C, Temps d’activation= 4h, Quantité d’H2SO4 adsorbée=1,75meq/g d’argile, Capacité d’échange cationique : CEC=70meq/100g d’argile, Surface spécifique=950 m2/g) en vue d’obtenir des zéolithes HY activées très performantes utilisées en qualité d’adsorbants. Les zéolithes HY activées ont été caractérisées par les techniques suivantes : Fluorescence X (pourcentage atomique), Diffraction des rayons X, le Microscope électronique à balayage et par des analyses physico-chimiques (Capacité d’échange cationique, la masse volumique, l’indice d’acidité, la surface spécifique et le diamètre moyen des pores).D’après les résultats des diffractogrammes RX , les zéolithes HY activées ne subissent aucunes modifications chimiques ni la destruction de leur réseaux cristallins et la création d’une structure cristalline plus uniforme .Les diamètres moyen des pores des zéolithes activées : Zéolithe HY à5M/70°C,Zéolithe HY à5M/90°C,Zéolithe HY à7M/70°C sont de l’ordre de 14,74 ; 15,02 et 17,01 A°, respectivement et leurs surfaces spécifiques sont de l’ordre de 650 ; 950 et 995 m2/g, respectivement. Les propriétés physiques des matériaux zéolithiques étudiés montrent une augmentation de la surface spécifique, la masse volumique et la porosité (diamètre moyen des pores) après traitement de la zéolithe HY par différentes concentrations à l’acide sulfurique, ces résultats confirment l’amélioration de la structure microporeuse et la création d’un réseau de tamis moléculaire plus développé. Avec les propriétés structurales et texturales déterminées, on peut conclure que les zéolithes activées ainsi obtenues sont des matériaux très réactifs et peuvent être utilisés dans des processus de dépollution des eaux usées industrielles
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    Valorization of algerian leguminous: extraction and characterization of galactomannans
    (Aljest, 2018) Bouhadi, N.; Hachemi, N.; Kahlouche, A.; Djeziri, M.; Touabia, M.; Nouani, A.
    This study has an environmental objective based on the valorization of the seeds of legumes in order to obtain a clean nature, its seeds are considered as a good source of galactomannans which can replace other synthetic polysaccharides.They consists on the evaluation of physicochemical properties of galactomanans isolated from different seeds parts of two leguminous species widely known in Algeria: Gleditsia triacanthos and Ceratonia siliqua (carob), which represent an important source of polyscharids. The extraction gave an appreciable yield assessed at 12.97% of Gleditsia triacanthos and 11.45% of Ceratonia siliqua; values witch encourage their valorization. The physicochemical composition of the extracted galactomanans showed comparable characteristics in term of humidity; pH; °Brix and ashes. While; rheologic properties revealed that galactomanans solutions have a pseudo plastic nature. In the other hand; the functional properties analysis showed that the galactomanans obtained are soluble in water; the water absorption capacity was higher for Gleditsia triacanthos than Ceratonia siliqua with 20.62 and 5.98 respectively. Infrared analysis demonstrate that the same chemical structures of galactomanans were extracted from the two spices. NMR analysis allowed us to estimate the galactose / mannose ratio of the two extracts. This ratiois 1.25/1 and 3.63/1 of Gleditsia triacanthos and Ceratonia siliqua respectively
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    Study of the adsorption of methylene blue by natural materials (olive stone, date pit and their mixture) in fixed bed column
    (Aljest, 2019) Abed, F.; Louhab, K.; Abai, Nadjet; Babakhouya, N.
    The present study focuses on the recovery of two agro-food waste available in our country with significant quantities olive pomace and date pits for the removal of a synthetic dye which is methylene blue. Both materials were used in their native forms separated and mixed to improve their adsorptive capacity. A range of physico-chemical analysis was performed to characterize adsorbents used, among them: the FTIR spectroscopy and the scanning electron microscopy. The ability of adsorbents prepared to adsorbe methylene blue (MB) from the aqueous solution was investigated in a fixed bed column. The effects of several important parameters were studied, such as initial concentration of MB, flow rate and bed height. The corresponding breakthrough curves were calculated
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    Adsorption of copper (ii) from aqueous solutions on ‎antimony pillar/clay composite
    (Aljest, 2015) Cherifi, H .; Bougherara, S.; Louhab, K.
    The separation of copper from aqueous systems is studied for ‎environmental protection. In this paper was studied the elimination ‎of cooper from dilute aqueous solution by adsorption on a crude ‎and chemical modified clays (pillared layers clays).The kinetics ‎study of the adsorption of copper on the modified clay showed that ‎equilibrium is reached after 60 mn. A high adsorption ‎performance was recorded for the following optimum conditions at ‎the temperature T = 25°C and the solid/liquid ratio = 2, Initial ‎concentration of ion Cu2+ =40 mg /L, the amount of adsorbent ‎clay = 800 mg, pH = 6
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    A comparative study of raw and treated peach stones for the adsorption of hexavalent chromium: characterization, kinetic and thermodynamic modelling
    (2018) Khemmari, Fariza; Benrachedi, K.
    In the last years, much attention has been focused on the use of low-cost adsorbents for the removal of heavy metals from wastewater. The present study consists of comparing the adsorption of hexavalent chromium in aqueous solutions by two adsorbents: raw peach stones (RPS) and peach stones activated carbon (PSAC). The characterization of the adsorbents was done by using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Comparative study was carried out using adsorption parameters such as contact time, adsorbent dose and solution pH in a batch system. Results show that pH is key parameter for adsorption optimization. The time necessary to attain adsorption equilibrium was found 120 min for PSAC in the pH range 2-5.6 and 240 min for RPS at pH 2 with maximum removal percentage greater than 97% for both adsorbents. The adsorption process followed the pseudo-second order kinetics. Thermodynamic parameters revealed the spontaneous and endothermic nature of the adsorption process for both adsorbents. Investigations carried out proved that RPS and PSAC are good potential adsorbents for the treatment of toxic hexavalent chromium
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