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Magnetic Graphene Oxide: Effect of Preparation Route on Reactive Black 5 Adsorption
Department of Petroleum and Natural Gas Technology, Technological Educational Institute of Kavala, Kavala GR–654 04, Greece
Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki GR–541 24, Greece
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki GR–541 24, Greece
* Author to whom correspondence should be addressed.
Received: 14 January 2013; in revised form: 21 March 2013 / Accepted: 25 March 2013 / Published: 28 March 2013
Abstract: In this study, the effect of preparation route of magnetic graphene oxide (mGO) on Reactive Black 5 (RB5) adsorption was investigated. The synthesis of mGO was achieved both with (i) impregnation method (mGOi nanoparticles), and (ii) co-precipitation (mGOp nanoparticles). After synthesis, the full characterization with various techniques (SEM, FTIR, XRD, DTA, DTG, VSM) was achieved revealing many possible interactions/forces of dye-composite system. Effects of initial solution pH, effect of temperature, adsorption isotherms and kinetics were investigated in order to conclude about the aforementioned effect of the preparation method on dye adsorption performance of the magnetic nanocomposites. The adsorption evaluation of the magnetic nanoparticles presented higher adsorption capacity of mGOp derivative (188 mg/g) and lower of mGOi (164 mg/g). Equilibrium experiments are also performed studying the effect of contact time (pseudo-first and -second order equations) and temperature (isotherms at 25, 45 and 65 °C fitted to Langmuir and Freundlich model). A full thermodynamic evaluation was carried out, calculating the parameters of enthalpy, free energy and entropy (ΔH0, ΔG0 and ΔS0).
Keywords: magnetic graphene oxide; preparation; impregnation; co-precipitation; adsorption; reactive dye
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Kyzas, G.Z.; Travlou, N.A.; Kalogirou, O.; Deliyanni, E.A. Magnetic Graphene Oxide: Effect of Preparation Route on Reactive Black 5 Adsorption. Materials 2013, 6, 1360-1376.
Kyzas GZ, Travlou NA, Kalogirou O, Deliyanni EA. Magnetic Graphene Oxide: Effect of Preparation Route on Reactive Black 5 Adsorption. Materials. 2013; 6(4):1360-1376.
Kyzas, George Z.; Travlou, Nikolina A.; Kalogirou, Orestis; Deliyanni, Eleni A. 2013. "Magnetic Graphene Oxide: Effect of Preparation Route on Reactive Black 5 Adsorption." Materials 6, no. 4: 1360-1376.