Publications Scientifiques

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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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    Performance of Streptomyces rimosus biomass in biosorption of heavy metals from aqueous solutions
    (Elsevier, 2018) Sahmoune, Mohamed Nasser
    The removal of heavy metals by Streptomyces rimosus has been the subject of many investigations. This review paper focuses on the removal of heavy metals from aqueous solution through Streptomyces rimosus, produced from pharmaceutical industry as solid waste, as adsorbent, and discusses the effect of various process parameters like pH, temperature, metal concentration etc., on the metal removal efficiency of this bacterium. The paper also evaluates the different kinetic, equilibrium, and thermodynamic models used in Streptomyces rimosus sorption of heavy metals. Biomass characterization and sorption mechanisms as well as elution of metal ions are also discussed. The literature revealed that Streptomyces rimosus had a good affinity for binding lead and iron compared with other heavy metals. The adsorption of heavy metals is well described by Langmuir isotherm, which expresses the existence of monolayer adsorption. The kinetic data followed both pseudo first order and pseudo second order models. Thermodynamic studies showed spontaneous and exothermic nature of the sorption processes in most case. Dilute acids (HCl and H2SO4) are quite effective in desorption of heavy metals. Ion exchange played the chief role in the adsorption mechanism of metal, and carboxyl groups are mainly involved in this mechanism