Publications Scientifiques
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Item Valorization of peach stones to high efficient activated carbon : synthesis, characterization, and application for Cr(VI) removal from aqueous medium(Taylor & Francis, 2018) Khemmari, Fariza; Benrachedi, KhaledItem A comparative study of raw and treated peach stones for the adsorption of hexavalent chromium: characterization, kinetic and thermodynamic modelling(2018) Khemmari, Fariza; Benrachedi, K.In the last years, much attention has been focused on the use of low-cost adsorbents for the removal of heavy metals from wastewater. The present study consists of comparing the adsorption of hexavalent chromium in aqueous solutions by two adsorbents: raw peach stones (RPS) and peach stones activated carbon (PSAC). The characterization of the adsorbents was done by using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Comparative study was carried out using adsorption parameters such as contact time, adsorbent dose and solution pH in a batch system. Results show that pH is key parameter for adsorption optimization. The time necessary to attain adsorption equilibrium was found 120 min for PSAC in the pH range 2-5.6 and 240 min for RPS at pH 2 with maximum removal percentage greater than 97% for both adsorbents. The adsorption process followed the pseudo-second order kinetics. Thermodynamic parameters revealed the spontaneous and endothermic nature of the adsorption process for both adsorbents. Investigations carried out proved that RPS and PSAC are good potential adsorbents for the treatment of toxic hexavalent chromiumItem Removal of polyphenols from olive mill wastewater by adsorption on activated carbon prepared from peach stones(Cartimex, 2017) Ziati, Mounir; Khemmari, Fariza; Cherifi, Ouiza; Didouche, Yasmina-FadilaItem Removal of chromium from tannery wastewater by electrosorption on carbon prepared from peach stones : effect of applied potential(2017) Ziati, Mounir; Khemmari, Fariza; Kecir, Mohamed; Hazourli, SabirThe objective of this study is the removal of chromium from tannery wastewater by electrosorption on carbon prepared from lignocellulosic natural residue "peach stones' thermally treated. The followed steps for obtaining coal in chronological order were: cleaning, drying, crushing and finally its carbonization at 900°C. The characterization of the carbon material resulted in properties comparable to those of many coals industrially manufactured. The study of the dynamic adsorption of chromium on the obtained material resulted in a low removal rate (33.7%) without applied potential. The application of negative potentials of -0.7 V and -1.4 increases the adsorption of chromium up to 90% and 96% respectively. Whereas a positive potential of +1.4V allows desorption of the contaminant of 138%