Adsorption of Basic Blue 41 using Juniperus excelsa: Isotherm, kinetics and thermodynamics studies

Year 2019, , 112 - 121, 30.09.2019

Ali Rıza Kul , Adnan Aldemir , Salih Alkan Hasan Elik , Meliha Çalışkan

https://doi.org/10.35208/ert.568992

Cited By: 7

Abstract

In this study Juniperus excelsa shavings powder (JESP)
was utilized as an adsorbent for the removal of Basic Blue 41 (BB 41) which is
one of the common basic dyes, from aqueous solution. The adsorption experiments
were carried out in a batch system and effects of initial concentration of dye,
interaction time and temperature were investigated. Langmuir, Freundlich and
Temkin adsorption isotherms were used to model equilibrium data. According to
the results, Freundlich isotherm model becomes more convenient option compared
with Langmuir and Temkin models. Freundlich model coefficients are raise as the
temperature rises, showing that the adsorption process becomes favorable higher
temperature. The kinetic parameters were determined by pseudo first order
(PFO), pseudo second order (PSO) and intra-particle diffusion (IPD) models.
Results indicated that experimental and calculated qe values are matched to
each other. Thus the process fits PSO kinetic model with higher R²
values than other two models. Kinetic constants become closer to both temperatures
and initial concentrations and qe values are increases with increasing
concentration of BB 41. Initial dye concentration elevates from 25 to 100 mg L^-1,
dye adsorption capacity onto JESP from 3.06 to 16.53 mg g^-1,
respectively. Thermodynamic parameters for instance free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) were
assessed. Enthalpy and entropy of this separation process are determined from
3081.91 J mol^-1 and 12.33 kJ mol^-1, respectively. The
negative values of ΔG° showed that
this separation process was endothermic and natural. The research results
demonstrate that JESP may be a substitute than pricey adsorbents for dye
removal.

Keywords

Basic Blue 41, dye adsorption, Juniperus excelsa, isotherm models, kinetic and thermodynamic parameters

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