Publications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13

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Author: search.filters.author.Cherfi, Abdelhamid

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    A full factorial design‐based desirability function approach to investigate the transport of Ni2+, Co2+, Cr3+ and Zn2+ through polymer inclusion membranes
    (Desalination Publications, 2023) Cherfi, Abdelhamid; Maache-Rezzoug, Zoulikha; Rezzoug, Sid-Ahmed
    In the present study, the full factorial design methodology was used to investigate and optimize the operating conditions of a membrane process involving polymer inclusion membranes (PIMs), for the competitive removal of Ni2+, Co2+, Cr3+ and Zn2+ from aqueous solutions. The effects of three parameters: initial concentration of metals (X1), extractant content (X2) and membrane thickness (X3) were investigated on the matter fluxes crossing the PIMs (Ji), the amount of metal ions fixed within them (τf), and transferred through them (τt). The study revealed that: (1) the selectivity order of metal ions crossing the synthesized PIMs is: Zn > Ni > Cr > Co, (2) the order of significance of the effects is: X1 > X2 > X3, (3) X1 and X2 have positive effect on J, τf and τt while X3 has a negative effect on J and τt, and (4) the estimated models for the responses fit the experimental data adequately (deter-mination coefficient: R2 = 84.70%–99.99%; standard deviation: SD = 0.0021 – 1.58). The desirability function-based optimization indicated that: Jmax and τtmax are obtained for X1max (200 ppm), X2max (60% w/w) and X3min (50 µm), for a desirability value of 0.93 and 0.81, respectively, while τfmax is obtained for X1max, X2max and X3max (65 µm), for a desirability value of 0.93.
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    Technical-economic study of PVC-based formulations intended to industrial 3-wire electric cables, using a full factorial design methodology
    (2023) Cherfi, Abdelhamid; Dehak-Oughlissi, Karima; Ben Meddour, Touhami
    In the present study, full factorial designs were used to model and optimize the mechanical properties of PVC-based formulations constituting three-core power cables: sheathing, insulation and stuffing, while respecting the standards in force, and aiming for a minimum cost. The effects of 4 parameters: plasticizer content (X1), filler content (X2), stabilizing agent content (X3) and the kind of plasticizer were investigated on the following properties: Density (D), Hardness (H), Elongation at break (EB) and Fracture resistance (FR), as well as the price (DA/kg of formulation). The desirability-based optimization gave the following values: EB = 214.72%, FR = 19.94 MPa and Price = 116.71 DA/kg for the sheathing; EB = 198.11%, FR = 4.38 MPa and Price = 61.73 DA/kg for the stuffing; EB = 207.84%, FR = 19.35 MPa and Price = 102.73 DA/kg for the insulation. The study revealed also that the order of significance of the effects on the mechanical properties was: X1>X2>X3 and that the use of cheapest plasticizer did not affect greatly the mechanical properties
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    Adsorption of the Coomassie Brilliant Blue (BBC) onto apricot stone activated carbon : kinetic and thermodynamic study
    (Elsevier, 2014) Kaddour, Samia; Abbas, Moussa; Aksil, Tounsia; Cherfi, Abdelhamid
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    Risk assessment of heavy metals via consumption of vegetables collected from different supermarkets in La Rochelle, France
    (Springer, 2016) Cherfi, Abdelhamid; Cherfi, Malika; Maache-Rezzoug, Zoulikha; Rezzoug, Sid-Ahmed
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    Health risk assessment of heavy metals through consumption of vegetables irrigated with reclaimed urban wastewater in Algeria
    (Elsevier, 2015) Cherfi, Abdelhamid; Achour, Mohamed; Cherfi, Malika; Otmani, Samia; Morsli, Assia
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    Kinetic and equilibrium studies of coomassie blue G-250 adsorption on apricot stone activated carbon
    (2015) Abbas, Moussa; Cherfi, Abdelhamid; Kaddour, Samia; Aksil, Tounsia; Trari, Mohamed
    The preparation of Activated Carbon from Apricot Stone (ASAC) with H3PO4 and its ability to remove the Coomassie Blue (CB) used in textile industry from aqueous solutions are reported in this study. The FTIR spectroscopy is used to get information on interactions between the adsorbent and CB. A series of contact time experiments were undertaken in stirred batch adsorber to assess the effect of the system variables. The results were discussed and showed that ASAC can be used in the wastewater treatment. A comparison of two models on the overall adsorption rate showed that the kinetic of adsorption was better described by the pseudo-second order model. The adsorption isotherms of CB onto ASAC are determined and correlated with common isotherms equations. The smaller RMSE values obtained for the Freundlich model indicate the better curve fitting; the monolayer adsorption capacity of CB is found to be 10.09 mg/g at temperature 22.5 °C and 98.022 mg/g at temperature 50 °C and pH ~ 2. The thermodynamic parameters indicate the spontaneous and exothermic nature of the adsorption process. The positive value of the entropy (ΔS) clearly that the randomness in decreased at the solid-solution interface during the CB adsorption onto ASAC, indicating that some structural exchange may occur among the active sites of the adsorbent and the ions. The activation energy (66.161 kJ/ mol) indicates that the chemical adsorption was predominant
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    Adsorption in simple batch experiments of Coomassie blue G-250 by apricot stone activated carbon—Kinetics and isotherms modelling
    (Taylor & Francis, 2015) Abbas, Moussa; Cherfi, Abdelhamid; Kaddour, Samia; Aksil, Tounsia
    The preparation of an activated carbon from apricot stones (ASAC) with H3PO4 activation and its ability to remove the Coomassie blue (CB) from aqueous solutions are reported in this study. The spectroscopy method is used to get information on interactions between the functional groups of the adsorbent and the CB. Batch adsorption experiments were first undertaken to assess the effect of various parameters on the removal efficiency of CB. It was observed that under optimized conditions up to 98.022 mg/g could be removed from solution at 50°C. The equilibrium experimental data were analysed using Langmuir and Freundlich isotherm equations. An error-based statistic study showed that the isotherm data are well described by the Freundlich model. The suitability of the kinetic models for the adsorption of CB onto ASAC was also investigated. It was found that the adsorption kinetics of the dye obeyed pseudo-second-order kinetic model. The evaluation of thermodynamics parameters such as activation energy of adsorption (Ea: 66.161 kJ/mol) predicted the chemisorption nature of the sorption process. The negative Gibbs free energy (−ΔG° = 15.21–19.27 kJ/mol) and negative enthalpy change (ΔH° = −55.088 kJ/mol) indicated, respectively, the spontaneous and exothermic nature of the reaction