ORIGINAL RESEARCH
Adsorption of Acid Red 88 Anionic Dye from Aqueous Solution onto ZnO/ZnMn2O4 Nanocomposite: Equilibrium, Kinetics, and Thermodynamics
Wojciech Konicki1, Daniel Sibera2, Urszula Narkiewicz2
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1Department of Environmental Protection, Maritime University of Szczecin,
H. Pobożnego St. 11, 70-507 Szczecin, Poland
2Institute of Chemical and Environment Engineering, West Pomeranian University of Technology,
Szczecin, 70-322, Pułaskiego St. 10, Poland
Submission date: 2016-08-09
Final revision date: 2017-02-09
Acceptance date: 2017-03-29
Online publication date: 2017-10-10
Publication date: 2017-11-07
Pol. J. Environ. Stud. 2017;26(6):2585-2593
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ABSTRACT
The adsorption of acid red 88 (AR88) anionic dye onto ZnO/ZnMn2O4 nanocomposite (ZnMn-NC) prepared by the hydrothermal method was carried out. The adsorbent was characterized by means of XRD, SEM, HRTEM, Raman spectroscopy, FTIR, BET, and zeta potential measurements. We investigated the influence of dye initial concentration, temperature, and pH on AR88 adsorption onto ZnMn-NC. Equilibrium data were analyzed by model equations such as Langmuir and Freundlich isotherms and were best represented by the Freundlich isotherm model. The experimental kinetic data were analyzed using pseudo first-order, pseudo second-order, and intraparticle diffusion kinetic models. The adsorption kinetics was best fitted to the pseudo second-order kinetic model. Thermodynamic parameters, change in free energy ΔGº, enthalpy ΔHº, and entropy ΔSº were also evaluated, indicating the spontaneous and exothermic character of the adsorption of AR88 onto ZnMn-NC.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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