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    Mass transfer processes in the adsorption of Lead (Pb2+) by apricot stone activated carbon (ASAC) : isotherms modeling and thermodynamic study
    (Springer, 2021) Abbas, Moussa
    In the present study, batch experiments were carried out to elucidate the potential of apricot stone activated carbon ASAC to remove Pb2+ ions from aqueous solution. ASAC was characterized by Bruanauer, Emmett and Teller surface area S = 80.08 (m2/g), Fourier transform infrared spectroscopy and scanning electron microscopy. The effects of various process parameters such as initial pH (2–14), adsorbent dose (5–45 g/L) initial metal ion concentration (20–0 mg/L), contact time (0–90 min), agitation speed (100–700 rpm) and temperature (298–323 k) were investigated in their respective range and their optimum conditions were ascertained. The adsorption kinetics were analyzed by the pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion kinetic models. It was found that the adsorption of the metal ions followed pseudo-second-order kinetic model. The Adsorption isotherms were modeled with Langmuir, Freundlich, Temkin, Hasley and Harkins models and their isotherm constants were calculated. The Freundlich model fits the data with a monolayer adsorption capacity of 166.813 mg/g at pH 8. The thermodynamic parameters such as the Gibbs free energy, enthalpy and entropy were calculated to predict the nature of adsorption process. The calculated thermodynamic parameters showed that the adsorption of Pb2+ ions on ASAC is endothermic (ΔH0 = 121.38 kJ/mol) and not spontaneous (ΔG0 > 0) in nature
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    Removal of toxic methyl green (Mg) in aqueous solutions by apricot stone activated carbon – equilibrium and isotherms modeling
    (Taylor & Francis, 2018) Abbas, Moussa; Aksil, Tounsia; Trari, Mohamed
    Apricot stone activated carbon (ASAC), was powdered, activated and to be used as effective adsor-bent to remove the dyes from aqueous solutions through batch experiments under operational factors namely, pH, contact time, adsorbent dose, initial dyes concentration and temperature. The physico-chemical, morphological and structural properties of the adsorbents were characterized by scan-ning electron microscope (SEM) and X-ray diffraction (XRD) instruments. Different kinetic modelsindicated that the adsorption is well described by the pseudo-second order model. The isotherms of methyl green (MG) adsorption on ASAC were obtained and correlated with various models. The smaller RMSE values for the Langmuir and Dubinin-Radushkevic models indicated the best fitting; the mono layer adsorption capacity of MG was found to be 148.478 mg g–1 at 21°C and 88.11 mg g–1 at 46°C at pH 10. The thermodynamic functions showed spontaneous and endothermic MG adsorption. In conclusion, the adsorbent prepared from apricot stone (ASAC) was found to very effective and suitable adsorbent for reactive dyes removal from aquatic environment, due to its simple and cheap preparation, easy availability and good adsorption capacity.
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    Removal of Methylene Blue in Aqueous Solution by Economic Adsorbent Derived from Apricot Stone Activated Carbon
    (Springer link, 2020) Abbas, Moussa; Trari, Mohamed
    Quantitative adsorption kinetic and equilibrium parameters for methylene blue (MB) used in the textile industry from aqueous solutions were reported in this study using pHPZC and UV-visible absorption spectroscopy. The effects of adsorbent dosage (1–10 g/l), agitation speed (100–1200 rpm), particule size (63 µm to 2 mm), initial dye concentration (4–15 mg/l), contact time, pH (2–14), and temperature (298–338 K) were determined to find the optimal conditions for adsorption. The FTIR spectroscopy is used to get information on interactions between the adsorbent and MB. The mechanism of adsorption of MB dyeing onto Apricot Stone Activated Carbon (ASAC) was investigated using the pseudo first-order, pseudo second-order kinetic, Elovich and intraparticles diffusion models. The adsorption isotherms of MB onto ASAC are determined and correlated with common isotherm equations. The smaller RMSE value obtained for the Langmuir model indicates the better curve-fitting and the monolayer adsorption capacity of MB is found to be 46.03 mg/g at 25 °C and 88.50 mg/g at 70 °C and pH 10. The evaluation of thermodynamics parameters such as the negative free energy ΔG° (+2.70025 to −1.76666 kJ/mol) and positive enthalpy change ΔH° (28.87613 kJ/mol) indicated a spontaneous and endothermic nature of the reaction with chemisorption process. This study in tiny batch gave rise to encouraging results, and we wish to achieve the adsorption tests in column mode under the real conditions applicable to the treatment of industrial effluents. The present investigation showed that ASAC is potentially a useful adsorbent for the heavy metals and dyes
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    Experimental investigation of activated carbon prepared from apricot stones material (ASM) adsorbent for removal of malachite green (MG) from aqueous solution
    (SAGE Publications, 2020) Abbas, Moussa
    The adsorption of malachite green onto activated carbon prepared from apricot stones material has been investigated at batch conditions. The effects of contact time (0–60min), initial pH (3–11), agitation speed (100–700 r/min), temperature (298–343K), adsorbent dose (1–10 g/L), and malachite green concentration (4.45–17.6mg/L) on the malachite green adsorption by apricot stones material have been studied. Malachite green removal increases over the contact time until equilibrium. The batch adsorption experiments were carried out to optimize the physical parameters on the malachite green removal efficiency. It has been found that 23.80mg/g at 25 C and 88.05mg/g at 70 C were removed. The kinetic parameters, rate constants and equilibrium adsorption capacities, were calculated and discussed for each kinetic model. The adsorption of malachite green onto apricot stones material is well described by the pseudo second-order equation. The experimental isotherm data were analyzed by different models; the adsorption follows the Langmuir model, providing a better fit of the equilibrium data. The thermodynamics parameters such as the negative free energy DG ( 0.191 to 4.447 kJ/mol) and positive enthalpy DH (50.86 kJ/mol) indicated the spontaneous and endothermic nature of the malachite green adsorption with a chemisorption process
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    Adsorption of malachite green (MG) onto apricot stone activated Carbon (ASAC)-Equilibrium, kinetic and thermodynamic studies
    (2017) Abbas, Moussa; Aksil, Tounsia
    The adsorption of malachite green (MG) onto apricot stone activated carbon (ASAC) in a batch adsorber and the effects of contact time, initial pH, agitation speed, adsorbent dosage and initial dye concentration on the MG adsorption by the ASAC have been studied. It was observed that under optimized conditions up to 23.94 mg/g at 25 oC and 88.5 mg/g at 70 oC could be removed from solution. Kinetic parameters; rate constants, equilibrium adsorptin capacities and correlation coefficients, for each kinetic equation were calculated and discussed. It was shown that the adsorption of MG onto ASAC could be described by the pseudo second-order equation. The experimental isotherm data were analyzed using the Langmuir, Freundlich, Temkin, Elovich and Redlich-Peterson equations. Adsorption of MG onto ASAC followed the Langmuir isotherm. The evaluation of thermodynamics parameters such as the negative Gibbs free energy and positive enthalpy change indicated respectively the spontaneous and endothermic nature of the reaction and the chimisorption of the sorption process
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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
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    Kinetic and equilibrium studies of cobalt adsorption on apricot stone activated carbon
    (Elsevier, 2014) Abbas, Moussa; Kaddour, S.; Trari, M.
    The activated carbon from apricot stone with H3PO4 and its ability to remove Co2+ are reported. The FTIR spectroscopy brings insights on interactions between the functional groups of the carbon and Co2+. Adsorption studies are carried in batch mode by varying the initial Co2+ concentration and pH. A comparison of two kinetic models on the overall adsorption rate shows that the system is described by the pseudo-second-order kinetic model. The Freundlich model fits the data with a monolayer adsorption capacity of 111.11 mg/g at pH 9. The enthalpy and free energy indicate an endothermic and not spontaneous process