Publications Internationales

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Author: search.filters.author.Cherfi, AbdelhamidHas files: No

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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