A B S T R AC TActivated carbon was prepared from Algerian date pits using physicochemical activation method consisted of zinc chloride (ZnCl 2 ) treatment and carbon dioxide (CO 2 ) gasifi cation. The activated carbon produced was characterized by BET surface area, porosity development (total pore volume and micropore fraction). Adsorption of Orange G dye (OG) from water was studied using the prepared activated carbon. A three-factor central composite design (CCD) combined with response surface modeling (RSM) was employed for maximizing OG removal from aqueous solution by the activated carbon based on 20 different experimental data obtained in a batch study, the effects of various parameters such us agitation time, initial dye concentration and adsorbent dosage were studied. The signifi cant factors on experimental designs response were identifi ed from the analysis of variance (ANOVA). FTIR spectral result indicated all the functional groups were involved in the adsorption process. SEM results showed that the surface of the activated carbon was turned from dark to light color after dye adsorption.
ab s t r ac tSeveral active carbons were prepared starting from Algerian date pits by chemical activation with the ZnCl 2 , by physical activation with the CO 2 , and by a method combined in the presence of ZnCl 2 /CO 2 . The active carbons obtained were followed by the evaluation of the yield and the physisorption of nitrogen at 77 K. Activated carbon particles were analyzed by scanning electron microscope (SEM). Indeed, it showed that mesoporous active carbon can be obtained at a lower cost by chemical impregnation in ZnCl 2 with 800°C followed by activation with CO 2 . Thus, techniques combining the chemical method (ZnCl 2 ) and the physical method (CO 2 ) help to widen the pores allowing the conversion of the micropores into mesopores. Dye contamination in wastewater can lead to a variety of environmental problems. Colored water can affect plant life and thus an entire ecosystem can be destroyed by contamination of various dyes in water. The produced AC was tested against methylene blue and Congo red. This test was conducted to check the ability of the produced activated carbon. The mesoporous carbons showed high adsorption capacity of methylene blue and Congo red.
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