An efficient removal of RB5 from aqueous solution by adsorption onto nano-ZnO/Chitosan composite beads
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Date
2017
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Abstract
In this study, the removal of Reactive Black 5 (RB-5) by nano-ZnO/Chitosan composite beads (nano-ZnO/CT-CB) from aqueous solution was investigated. ZnO nanoparticles were prepared by the via the microwave-assisted combustion technique. And then nano-ZnO/Chitosan composite beads were prepared by polymerization in the presence of nano-ZnO and chitosan. Characterization of composite beads were conducted using SEM, TEM, FTIR, TGA and XRD. Several important parameters influencing the removal of RB 5 such as contact time, pH and temperature were investigated systematically by batch experiments. At optimum conditions of pH 4 and adsorbent concentration of 0.2 g, dye removal efficiency was found 76%. Langmuir, Freundlich and Temkin adsorption models were used to describe adsorption isotherms and constants. The maximum adsorption capacity (qm) by Langmuir isotherm has been found to be 189.44 mg/g. Isotherms have also been used to obtain the thermodynamic parameters such as free energy, enthalpy and entropy of adsorption. The positive value of the enthalpy change (32.7 kJ/mol) indicated that the adsorption is an endothermic process. The obtained results showed that the tested adsorbents are efficient and alternate low-cost adsorbent for removal of dyes from aqueous media. © 2016 Elsevier B.V.
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Adsorption , Chitosan , Coloring Agents , Hydrogen-Ion Concentration , Kinetics , Nanocomposites , Nanoparticles , Naphthalenesulfonates , Solutions , Temperature , Water , Water Pollutants, Chemical , Zinc Oxide , chitosan nanoparticle , dye , nanobead , nanocomposite , reactive black 5 , unclassified drug , zinc oxide nanoparticle , chitosan , coloring agent , nanocomposite , nanoparticle , naphthalenesulfonic acid derivative , Remazol black B , solution and solubility , water , water pollutant , zinc oxide , Article , chemical analysis , chemical reaction , chemical structure , enthalpy , entropy , infrared spectroscopy , nanotechnology , particle size , scanning electron microscopy , thermodynamics , thermogravimetry , thermostability , transmission electron microscopy , X ray diffraction , adsorption , chemistry , isolation and purification , kinetics , pH , solution and solubility , temperature , water pollutant