ABSTRACT. In this study, Ricinodendron heudelotii (akpi) shells are used as precursor to prepare activated carbon via chemical activation using phosphoric acid. The characterization of the obtained activated carbon is performed using X-ray diffraction (XRD), Boehm titration method and adsorption of acetic acid. The results show that the prepared activated carbon has a microstructure and a higher specific surface area (1179 m 2 /g), suggesting that the acid treatment has a significant positive influence on its sorption properties. The maximum adsorption capacity and pollutant elimination efficiency are found to be 43.48 mg/g and 90%, respectively. These results suggest that this low cost agent is an efficient tool to remove organic pollutants especially imidacloprid from wastewater.
H3PO4 activated corncob carbon was used for removal of methyl orange. Characterization of the prepared carbon showed that it has many pores with a specific surface area equal to 714 m2 g-1. During this study, the concentration of methyl orange was monitored using a UV-visible spectrophotometer. The kinetic study of the adsorption of methyl orange on activated carbon was performed and the adsorption rate was found to be consistent with pseudo-second order kinetics with 240 min as the equilibrium time. The equilibrium adsorption revealed that the experimental data better fit the Langmuir isotherm model for methyl orange removal. It is noted that for optimal removal of 10 mg L-1 methyl orange in a 25 mL volume, 0.3 g of activated carbon and a pH equal to 2.04 are required. The maximum monolayer adsorption capacity for methyl orange removal was found to be 107.527 mg g-1. Analysis of thermodynamic parameters showed that the adsorption process of methyl orange on activated carbon is physisorption, spontaneous and endothermic.
<p>In the present study, adsorption experiments were carried out to investigate the removal of rhodamine B from an aqueous solution using chemically activated carbon from corn cobs, a cheaper adsorbent. The characteristics of carbon were determined using X-ray diffraction, SEM, iodine number, pHpzc, and the Boehm titration method. The results show that the prepared activated carbon is amorphous, microporous, and generally acidic on the surface. The kinetic study of the adsorption of rhodamine B on this carbon was carried out, and the rate of sorption was found to conform to pseudo-second-order kinetics with 80 min as equilibrium time. The equilibrium adsorption revealed that the experimental data fitted better to the Langmuir isotherm model for removing rhodamine B. The interaction rhodamine B-activated carbon is mainly chemisorption type. The optimal conditions of rhodamine B removal onto the carbon of this study are mass of carbon = 0.3 g and pH = 3.15. The maximum monolayer adsorption capacity for rhodamine B removal was found to be 5.92 mg.g<sup>-1</sup>. This study has shown that the prepared activated carbon makes it possible to effectively clean up wastewater contaminated by rhodamine B with a removal efficiency of up to 99.60% for 300 mg of AC in 25 mL of the rhodamine B solution (5 mg.L<sup>-1</sup>).</p>
The purpose of this work is to prepare better activated carbons from the shells of Ricinodendron Heudelotii by chemical activation with sulfuric acid (H 2 SO 4 ) and sodium hydroxide (NaOH). The process was optimized by a full factorial design (2 K ) based on the analysis of the external specific surface area of sixteen ( 16) activated carbons prepared according to the parameters of the preparation. This active analysis reveals that under the preparation conditions, good carbons are obtained for a sodium hydroxide concentration equal to 1 M, an impregnation time of 24 h and carbonization at 500˚C for 1 h. The external specific surface of this carbon is 358 m 2 •g −1 . The characteristics of this prepared carbon are as follows: a pH at zero point charge (pHpzc) of 8.2, a predominantly amorphous structure, a basic character and a low ash content (4.2%). It also has surface functions; the lactonic and carbonyl groups (C=O) at 1600 cm −1 and the carboxylate groups (O-H or C-O) at 1340 cm −1 .
The shells of RicinodendronHeudelotii, an agricultural waste, were used to prepare magnetic activated carbon. To do this, activated carbon was prepared by chemical activation with NaOH. By co-precipitation with iron II and iron III ions, magnetic carbon (MG-AC) is obtained. These materials were characterized using scanning electron microscopy (SEM), nitrogen gas adsorption measurements at -196°C, energy dispersive X-ray fluorescence and a vibrating sample magnetometer. The results showed that MG-AC had 86.5% Fe2O3 and higher magnetic properties with a magnetic saturation of 75 emu.g-1. The Brunauer-Emmett-Teller (BET) surface area and pore volume of MG-AC were determined as 86.52 m2.g-1and 0.168 cm3.g-1 respectively. The removal of methylene blue on these two materials (AC and MG-AC) was done in the absence and in the presence of hydrogen peroxide. In the absence of , methylene blue adsorbs on these materials according to a pseudo order 2 kinetics with rates of 0.0047 and 0.0039 g.mg-1.min-1 respectively for AC and MG-AC. This adsorption can be described by the Langmuir model with maximum adsorption amounts of 13.4 and 9.6 mg.g-1 respectively for AC and MG-AC. The addition of leads to the production of hydroxyl radicals thanks to the presence of iron on MG-AC. Over 4 cycles of use Activated Carbon based on RicinodendronHeudelotii removed 99.6% of MB in the 1st cycle and only 5.23% due to the considerable loss of mass, while MG-AC removed this dye at 94.6% in the first cycle and 68.44% in the 4th cycle. There is therefore less loss of mass during the regeneration of MG-AC which still remains efficient after 4 cycles.
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