Isotherm, Kinetic and Thermodynamic Investigation into Methylene Blue Adsorption onto Pinecone Powder

In this study, the usage of pine cone powder as an adsorbent for removing methylene blue from aqueous solution was investigated. Within this scope adsorption experiments were performed and the results showed that the Freundlich isotherm model was a more convenient option compared to the Langmuir and Temkin models. The results also determined that the pseudo second order kinetic model demonstrated higher correlation coefficients (R2) values compared to the pseudo first order and intra-particle diffusion models. Initial dye concentration was found to shift from 100 to 300 mg/l, while adsorption capacity onto the pine cone powder changed from 40.99 to 95.24 mg/g, 41.56 to 97.93 mg/g, and 43.51 to 101.41 mg/g for 298 K, 308 K and 318 K, respectively. The thermodynamic parameters for the instant free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) of this separation process were found by referring to -1595,11 J/mol, 2465,83 J/mol and 12,77 J/mol, respectively. The negative ΔG◦ values revealed that this separation process was endothermic and natural.

Keywords:

dye adsorption, isotherm, kinetic thermodynamic, pine cone, methylene blue,

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Journal of International Environmental Application and Science-Cover

ISSN: 1307-0428
Yayın Aralığı: Yılda 4 Sayı
Başlangıç: 2006
Yayıncı: Selçuk Üniversitesi

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