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

Authors : Ali Rıza KUL, Adnan ALDEMİR, Salih ALKAN, Hasan ELİK, Meliha ÇALIŞKAN

Pages : 112-121

Doi:10.35208/ert.568992

View : 13 | Download : 7

Publication Date : 2019-09-30

Article Type : Research Paper

Abstract :In this study Juniperus excelsa shavings powder insert ignore into journalissuearticles values(JESP); was utilized as an adsorbent for the removal of Basic Blue 41 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(PFO);, pseudo second order insert ignore into journalissuearticles values(PSO); and intra-particle diffusion insert ignore into journalissuearticles values(IPD); models. Results indicated that experimental and calculated qe values are matched to each other. Thus the process fits PSO kinetic model with higher R 2 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 insert ignore into journalissuearticles values( ΔG );, enthalpy insert ignore into journalissuearticles values(ΔH); and entropy insert ignore into journalissuearticles values(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