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- 저자 : Esta A. Idohou (검색결과 1 건)
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Jacques K. Fatombi,Esta A. Idohou,Sèmiyou A. Osseni,Ignace Agani,David Neumeyer,Marc Verelst,Robert Mauricot,Taofiki Aminou 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
Activated carbon (AC) obtained from peanut shell, chitosan (CH) obtained from crab shell, and prepared chitosan/activated carbon (CH/AC) composite were studied in a batch system for the adsorption of indigo carmine (IC) from aqueoussolution. Characterizations of AC, CH, and CH/AC were investigated by FTIR, SEM, XRD, zero-point charge pHpzc,thermal analysis, surface area BET, and pore-size distribution. Adsorbent weight (0.01-0.1 g), initial pH solution (2-10),initial indigo carmine concentration (10-50 mg/l) and contact time (0-60 min) were used as parameters in the adsorptionequilibrium experiments. Pseudo-second-order kinetic model was found to describe the adsorption process better thanpseudo-first-order kinetic model. Langmuir, Freundlich, and Temkin isotherms applied to the adsorption data reveal that ACand CH/AC best fitted Langmuir and Freundlich models when CH data fitted Temkin model with maximum adsorptioncapacities of 82.64 mg/g for AC, 96.15 mg/g for CH, and 208.33 mg/g for CH/AC at 30 oC. Thermodynamic parameters suchas standard Gibbs free energy (ΔGo), standard enthalpy (ΔHo), and standard entropy (ΔSo) were -23.42 kJ/mol, 10.66 kJ/mol,and 112.40 J/K/mol, respectively for CH/AC. The negative value of ΔGo and a positive value of ΔHo indicate that theremoval of indigo carmine by CH/AC is spontaneous and an endothermic process.
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