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

Year 2019, Volume: 14 Issue: 4, 183 - 192, 30.12.2019

Adnan Aldemir , Ali Rıza Kul , Hasan Elik

Abstract

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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