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Equilibrium and Thermodynamic Investigation of Biosorption of Nickel from Water by Activated Carbon Made from Palm Kernel Chaff

Article scientifique 2020 Anglais

Résumé

Abstract Novel biosorbents were derived from a waste product of palm kernel oil extraction known a palm kernel chaff (PKC). One portion of the PKC was carbonized in a furnace and then activated chemically while the other half was activated without carbonization. Both were designated as CPKC and UPKC respectively. The two biosorbents so produced were then used to conduct batch equilibrium sorption studies at 30 ºC, 35 ºC and 40 ºC and pH 3.0 and 9.0. The Koble-Corrigan, Dubinin-Radushkevich and the Freundlich isotherms fitted the experimental data very well with R2 values of 0.97 to 1.0, 0.95 to 1.0 and 0.96 to 1.0 respectively. The linear type II Langmuir isotherm performed much better (0.96 ≤ R2 ≤ 1.0) than the nonlinear isotherm. The maximum sorption capacity was obtained as 120.6 mg/g using CPKC at pH 9.0 and 35ºC. The values of Langmuir separation coefficient (0.022 ≤ RL≤0.926) show that the sorption of nickel to PKC is favourable. The most favourable sorption condition was found for CPKC at pH 9 and temperature of 40 ºC. The values of sorption energy (8.21 ≤ E ≤ 14.27) and the isosteric heat of sorption (-133.09≤∆Hx≤-17.92) indicate that the mode of sorption is mostly ion exchange. Thermodynamic parameters also show that the process is exothermic and entropy-driven.

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Nnaji, C., Agim, E., Mama, C., Emenike, P., Ogarekpe, N. (2020). Equilibrium and Thermodynamic Investigation of Biosorption of Nickel from Water by Activated Carbon Made from Palm Kernel Chaff. https://doi.org/10.21203/rs.3.rs-124132/v1

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Auteur(s)

Chidozie Charles Nnaji Edward Agim Cordelia Nnennaya Mama PraiseGod Chidozie Emenike Nkpa Ogarekpe

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