Publications Nationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/14

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Subject: search.filters.subject.Adsorption

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    An heterotrophic autotrophic denitrification approach for nitrate removal from drinking water by alfa stems
    (ALJEST, 2022) Benrachedi, Abdellah Lokman; Selatnia, A.; Belouanas, O.; Benrachedi, K.
    Biological denitrification of drinking water was studiedin up-flow laboratory reactors packed with alfa stems served as the sole carbon source as well as the only physical support for the microorganisms. The highest rates of denitrification were observed in fresh reactors during their first week of operation and the efficiency of the process declined therafter. In the first part, we have analysed the influence ohhydrolyc and volumic load to value the capacity of nitrate prurification in a down flow submerged biofilter then with an experimental design approach, we have analysed the qualitative and quantita-tive aspects of the effects of some factors, concentration of nitrate (80-200 mgl-1 and velocity (0.31 mh-1 on different responses like the apparentrate of denitrification as well as concentration of nitrite, nitrate and chemical demand on oxygen (DCO)in the reactor outlet.
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    Flower‑Like Layered Double Hydroxides for the Adsorption of Azocarmine G: Kinetic, Isotherm, and Thermodynamic Studies
    (Springer, 2023) Meguellati, Zineb; Ghemmi, Naima; Brahimi, Razika
    The current research includes the adsorp- tion behavior of two flower-like layered double hydroxides (MgAl-LDH and MgFe-LDH) synthe- sized via co-precipitation method for the environ- mental remediation. The synthesized materials were characterized by several techniques like X-ray diffrac- tion (XRD), Fourier Transform Infrared spectrom- etry (FTIR), scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), differential ther- mogravimetry (DTG), and differential scanning calo- rimetry (DSC). The materials were also characterized by Brunauer-Emmett-Teller (BET) technique, and the obtained surface areas were 65.50 m2 ·g−1 and 51.43 m2 ·g−1 for MgAl-LDH and MgFe-LDH, respectively. The materials were tested for the adsorption removal of azocarmine G dye from aqueous medium; the experimental parameters, including the pH, the initial concentration, the adsorbent dose, and the time, were optimized to attain a maximum adsorption capacity of 105.9 mg·g−1 and 101.6 mg·g−1 for MgAl-LDH and MgFe-LDH, respectively, which confirms that the materials can be used for the effective dye removal. The kinetic study revealed that the pseudo-second order fitted well the adsorption process, and the iso- therms conformed well to the Langmuir model. The effect of temperature allowed to calculate the follow- ing thermodynamic parameters: ΔHMgAl°=12.083 KJ·mol−1 ; ΔHMgFe°=25.053 KJ·mol−1 ; ΔSMgAl°=43.81 JK−1 ·mol−1 ; and ΔSMgFe°=87.75 JK−1 ·mol−1 .
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    Etude du potentiel d’utilisation des déchets agroalimentaires, les grignons d’olives et les noyaux de date pour récupération et adsorption des métaux lourds
    (Université M'Hamed Bougara Boumerdes, 2015) Babakhouya, N.; Boughrara, S.; Abed, F.; Abai, N.; Midoune, S.
    La présente étude porte sur l’application d’un adsorbant naturel ‎préparé à base de grignon d’olives et de noyaux de dattes à ‎différents pourcentages dans le domaine de traitement des ‎effluents liquides industriels. Dans notre travail nous nous ‎sommes intéressés à son application pour le cadmium (métal ‎lourd). L’effet de plusieurs paramètres tel que le temps de contact, ‎la concentration initiale en ions de cadmium, et le pH de la ‎solution a été étudié en système en batch. Une modélisation des ‎isothermes d’adsorption a été effectuée à l’aide des models ‎d’isothermes de Langmuir, Freundlich et Temkin et leur ‎coefficient de corrélation obtenus, indiquent que le model de ‎Langmuir est favorable pour la plupart des proportions ‎d’adsorbants
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    Copper, Zinc And Nickel’s Removal By Bentonite Clay: Case Study In Mono And Multicomponent Systems
    (Université M'Hamed Bougara Boumerdes, 2019) Hamdache, F.; Chergui, A.; Halet, Farid; Yeddou, A.R.
    The main purpose of this work is the Copper, Zinc and Nickel’s removal from mono and multi-metal ions aqueous solution using an Algerian bentonite without treatment. The bentonite is characterized using SEM, XRD and X-ray fluorescence. The effect of initial pH and contact time are studied. Under mono and multicomponent systems, the kinetic studies performed at pH 5, indicate that the adsorption follows a pseudo second order model. For both systems, the isotherm data are well correlated with Langmuir model. Whereas the maximum adsorption capacities follow the sequence’s order Cu > Zn > Ni. In the case of multicomponent system, the Cu(II), Zn(II) and Ni(II) adsorptions capacities (58.82, 19.53 and 6.56 mg/g) are lower than the obtained ones for the monocomponent system (58.48, 49.02 and 31.74 mg/g). In addition to that, a mutual competitive effect is observed. Zn(II) and Ni(II) ions adsorption is also inhibited by Cu(II) ions with no change in the maximum Cu(II) adsorption capacity.
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    Preparation and Characterisation of adsorbent prepared from sewage sludge for removal of methylene blue
    (ALJEST, 2020) Djoumad, Sonia; Benrachedi, K.; Ladji, H.
    The objective of this study is to valorize an urban waste, the sludges from the wastewater treatment plant of Boumerdes/Algeria for the removal of methylene blue dye in aqueous solution by adsorption. The material made from this sludge has been characterized by various techniques: X-ray fluorescence microscopy (XRF), X- ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) to obtain information concerning their structures and their compositions.A systematic study of various parameters such as: effect of adsorbent dosage, contact time and initial dye concentration was carried out in order to optimize the ideal conditions for a good adsorption of the studied pollutant; especially the kinetics of adsorption.The exploitation of experimental results using different kinetic models and adsorption isotherms showed that the sludge has similar adsorption characteristics to those of activated carbon, which perfectly confirms the applicability of the activated sludge in the wastewater treatment.
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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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    Medicinal product (Paracetamol) removal by adsorption in aqueous solution; Investigation of kinetic parameters, equilibrium and mass transfer
    (Technology Publishing Group, 2022) Ouazene, Naima; Belhaneche-Bensemra, N.; Khelifi, A.; Benbatta, A.
    The adsorption behavior of the medicinal product, paracetamol, using commercial activated carbon in aqueous solution was investigated. In this work, the study of equilibrium, kinetics as well as the idenorder kinetics with R2 = 0.99 for the three studied concentrations. Two mathematical models were tested in order to determine the limiting step of the mass transfer of the paracetification of the mass transfer stages that occur in adsorption were carried out.It was found that the appropriate isotherm model for the equilibrium process was the Langmuir, and the monolayer adsorption capacity was found to be 104.17mg.g-1 at 298 K. The result of the adsorption kinetics shows that the adsorption maximum was reached at 60 min and follows the linear form of the pseudo second tamol adsorption process onto activated carbon. The results showed that the adsorption process was governed by external diffusion
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    Etude potentielle de mélange des adsorbants naturels (grignons d’olive et noyaux de dattes) pour l’adsorption du chrome
    (Aljest, 2016) Aksas, Hammouche; Cherifi-Nacy, H.; Babaci, N.; Louhab, K.
    Cette étude a pour objectif d’étudier le potentiel d’utilisation de matériaux naturels (mélange homogène de noyaux de dattes et de grignons d’olives) issus de l’activité d’agriculture pour le traitement des eaux usées, chargées en polluant métallique: le chrome. Ces deux matériaux ont été activés chimiquement par l’acide phosphorique, en les mélangeant à différents pourcentages, afin d’obtenir une solution solide homogène et d’améliorer leur capacité adsorptive. L’adsorption des ions du chrome est étudiée en milieu dispersé (batch) à la fois sur les matériaux pur et à l’état du mélange à différentes proportions, composées d’une quantité fixe en noyaux de dattes (ND), et des quantités du grignon d’olive (GO) variées. Les résultats d’adsorption du chrome montrent : qu’elle est maximale à un pH =5.6, croit avec la température et avec la concentration initiale du chrome dans la solution. Le modèle de Langmuir stimule mieux les isothermes d’adsorption du chrome que d’autres modèles étudiés (avec un coefficient de corrélation de 0.9988 pour (88% NDI, 12% GOI). L’adsorption du chrome augmente avec l’augmentation du taux du grignon d’olive dans le mélange d’adsorbant (grignon d’olive et noyau de date).
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    Feasibility study of adsorption of a textile dye on activated carbon prepared starting from the coffee grounds
    (Aljest, 2017) Mahdi, K.; Benrachedi, K.
    The activated carbon used in this study is prepared starting from the coffee ground whose abundance is important in our country and of which the use is often limited to food consummation. The physical characterization (porosity and surface) was determined by the adsorption of gas nitrogen to 77 K (BET), showed the presence of macropores (1.77 m2 /g), as well as the analysis by electronic scan microscopy MEB revealed the presence of a broad specific surface. The activated carbon obtained starting from the coffee ground was the object of an application to the aqueous medium for tests of elimination of a cation dye (methylene blue) used in the industry of textile, prepared synthetically. Several parameters were studied in order to optimize the ideal conditions for a good adsorption of the pollutant to study; in particular, the kinetics of adsorption, the effect of the initial concentration and the effect of the pH of the solution examined. The simulated isotherms of adsorption are very correctly described by the models of Langmuir and Freundlich. The percentage of discolouration reached is of: 99%. Therefore, one can conclude that this study showed that the coffee ground chemically activated can be used like new adsorbent for the water treatment contaminated by the textile dyes
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    Etude de l’adsorption des composés phénoliques sur des membranes polymères à base de poly (vinyl alcool) /β-cyclodextrine
    (Aljest, 2018) Ghemati, D.; Aliouche, D.
    L’objectif principal de ce travail est l’étude de d’adsorption des polluants aromatiques: 2- chlorophénol, 2-nitrophenol sur des membranes à base des polymères polyvinylalcool modifiées par la cyclodextrine. Pour cela des membranes à base de polyvinylalcool réticule avec le glutaraldehyde (PVA/GA) ont été préparés, puis l’incorporation de la β-Cyclodextrine dans ces membranes ((PVA / GA / β-CD) à différentes compositions (2, 4, 6, 8% β-CD) a été réalisé. La synthèse a été confirmée par analyse spectroscopique infra rouge (FTIR). Et le comportement du gonflement des membranes a été étudié. Enfin, Les expériences d’adsorption des composés phénoliques ont été réalisées dans des solutions aqueuses. Les résultats d’adsorption à différent pH indiquent que le maximum de la capacité d’adsorption est obtenu à pH