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Author: search.filters.author.Louhab, K.Subject: search.filters.subject.Chromium

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    Effect of chemical treatment of the biomass fongic on the capacity of adsorption of the chromium
    (European Journal of Scientific Research, 2006) Sahmoune, Mohamed Nasser; Louhab, K.; Addad, J.; Goma, B.
    Heavy metals are present in different types of industrial effluent, being responsable for environmental pollution. Biosorption by the biomass fungic is a promising alternative method to treat industrial effluents, mainly because of its low cost and high metal binding capacity. In this paper we studied the effect of treatment at different concentration NaOH of the biomass fungic on the caracteristics of the biomass (morphology of the fungic biomass), and the capacity of adsorption of chromium. The analysis of the thermodynamic, the kinetics of adsorption, the spectra of infra-red spectra and the electron micrographs of the M.E.B. watch that these treatments, although resulting in apreciable weight reduction, also enhanced their capacity adsorption for chromium, while increasing the sorption kinetics. © EuroJournals Publishing, Inc. 2006
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    Thermodynamic of chromium sorption on biomass fungi from aqueous solution
    (2006) Louhab, K.; Addad, J.; Barr, S.; Goma, B.
    The thermodynamics of chromium ions sorption from aqueous solution on biomass fungi have been investigated. The experimental data was analysed by Langmiur and Scatchard isotherms. The equilibrium sorption capacity of chromium ions was determined from Langmiur and Scatchard equation at different temperature. Bad correlation coefficients were obtained for the Langmiur adsorption equilibrium constant. Various thermodynamics parameters, Δ H°ads, Δ S°ads and equilibrium constant values were computed at different temperature. The results show that the sorption of the chromium ions on biomass fungi is spontaneous and exothermic nature process, the thermodynamics parameters are dependent of the temperature and the equilibrium sorption capacity
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    Speciation of chromium in bottom ash obtained by the incineration of the leather waste shavings
    (2006) Louhab, K.; Akssas, H.
    The evolution of bottom ash morphology and chromium metals behavior during incineration of a leather waste shavings at different incineration temperature have been studied. The Cr, Ca, Mg, Cl rates in bottom ashes, flay ashes and emitted gases in different incineration temperature of the tannery wastes are also determined. The morphology of the bottom ashes obtained by incineration at different temperature from the leather waste shavings was examined by MEB. The result show that the temperature and the length of incineration influence on the structure of the bottom ash and on the chromium in the bottom ash
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    Effect of calcium competition on chromium adsorption by fungi biomass
    (2006) Louhab, K.; Sahmoune, Mohamed Nasser; Addad, J.; Bar, S.
    The kinetics and thermodynamic of adsorption of a mono-solute of chromium ions and of a bi-solute of chromium and calcium ions by fungi biomass (Streptomycine rimosus) was investigated in a batch system. The experimental data were analyzed based by Langmuir isotherm and a Pseudo second order mechanism, in the both the mono-and bi-solute adsorption systems, in order to predict the rate constant of adsorption, the equilibrium capacity. The results indicate that the adsorption mechanism is described by Langmuir isotherm and a Pseudo-second-order. The equilibrium adsorption capacity and the equilibrium rate constant increased with an increase in the initial chromium concentration in both mono-and bi-solute adsorption systems. The adsorption capacity of chromium decreased with an increase in calcium concentration