Nadaroglu, HayrunnisaKalkan, EkremCelebi, NeslihanTasgin, Esen2024-10-042024-10-0420150009-85581471-8030https://doi.org/10.1180/claymin.2015.050.1.07http://hdl.handle.net/20.500.12403/36559th International Conference on the Occurrence, Properties and Utilization of Natural Zeolites -- JUN 08-13, 2014 -- Belgrade, SERBIAIn this study, a clinoptilolite modified with apolaccase was used to adsorb Reactive Black 5 (RB5) dye from aqueous solution using the batch procedure. The influences of pH, contact time, temperature and absorbent dosage on the adsorption were investigated. The optimum adsorption was obtained at pH = 6, contact time = 60 min, temperature = 25 degrees C and adsorbent dosages of 1.62 and 1.59 mg/50 mL per gram of clinoptilolite and of apolaccase-modified clinoptilolite (LMC), respectively). The adsorption experimental data fitted both the Langmuir and Freundlich isotherm models well. In addition, pseudo-first-order and pseudo-second-order kinetics were used to study the kinetics of RB5 dye adsorption onto natural clinoptilolite and LMC. Adsorption appears to follow pseudo-second-order kinetics with a high correlation coefficient. Thermodynamic parameters such as changes in the free energy (Delta G degrees), enthalpy (Delta H degrees) and entropy (Delta S degrees) of adsorption were calculated. The thermodynamic parameters indicate that the adsorption of RB5 dye onto LMC was less spontaneous, feasible and endothermic. The LMC can be used as an alternative low-cost adsorbent for the dye removal from aqueous solutions.eninfo:eu-repo/semantics/closedAccessReactive Black 5 dye removalapolaccase-modified clinoptiloliteadsorption isothermsadsorption kineticsConference Object501657610.1180/claymin.2015.050.1.072-s2.0-84946083208Q3WOS:000362443100008Q3