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Abstract
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In this study, magnetite/graphene oxide (MGO) nanocomposite was prepared and applied
for adsorption removal of Reactive Blue 19 (RB19). Optimization and modeling of the
removal of RB19 using MGO were performed through the response surface methodology
(RSM) based on central composite design (CCD). The MGO nanocomposite was synthesized
by coprecipitation method. The structure and morphology of the prepared nanocomposite
were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, scanning
electron microscopy, Brunauer–Emmett–Teller analysis and vibrating sample magnetometer
(VSM). Important factors influencing the adsorption of RB19 including pH, initial
concentration of RB19, adsorbent dosage, and contact time were considered as input variables
for RSM. The analysis of variance showed a high correlation coefficient (R2 = 0.954)
between experimental and predicted responses. The removal efficiency of dye was more
than 99% at the optimum condition proposed by RSM. Furthermore, the adsorption kinetic
studies revealed that the adsorption process followed the pseudo-second-order model.
Based on Langmuir isotherm model, the maximum adsorption capacity, qm, was calculated
to be 62.5 mg g−1.
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