Optimization by Response Surface Methodology of the Adsorption of Anionic Dye on Superparamagnetic Clay/Maghemite Nanocomposite
Shokoofe Rezaei, Soraya Rahpeima, Javad Esmaili, Vahid Javanbakht
Российский журнал прикладной химии
https://doi.org/10.1134/S1070427221040145
Magnetic nanoparticles and clay minerals combine to form a class of advanced nanocomposites that would possess exceptional adsorption, magnetism, and stability. In this work, an environmentally friendly nanocomposite was successfully fabricated by functionalizing natural clay. Bentonite сlay/meghemite nanocomposite was synthesized by the co-precipitation method and used to Methyl Orange pollutant removal as a toxic anionic dye from aqueous solutions. Physical and structural characteristics of the synthesized adsorbent were assessed using different techniques including Fourier transform infrared spectrometer, scanning electron microscopy, vibrating sample magnetometry, and X-ray diffraction. The saturation magnetization of maghemite and bentonite/maghemite nanocomposite are 50.9 and 28.5 emu g–1, respectively. The average size of the synthesized maghemite nanoparticles calculated by the Scherer equation was 16.60 nm. Different kinetic and thermodynamic models and isotherms of the adsorption process were also investigated. The adsorption capacity became equilibrium after 120 min. The consistency of the adsorption process with the pseudo-second-order kinetic model was confirmed by studying its kinetic data. Investigating the equilibrium isotherm data at different temperatures showed better compatibility with the Freundlich model. The negative values of ΔG and positive values of ΔH obtained from adsorption thermodynamic study revealed that Methyl Orange adsorption from aqueous samples is spontaneous and endothermic. The optimal parameters for Methyl Orange removal by synthesized adsorbent were determined by MINITAB 17 under response surface methodology (RSM). The maximum adsorption capacity of dye adsorption of 56.79 mg g–1 was obtained under optimum conditions of pH = 4, adsorbent dose of 1 g L–1 and dye concentration of 90 mg L–1.
- ACECR Institute of Higher Education (Isfahan Branch), 84175-443, Isfahan, IranShokoofe Rezaei, Soraya Rahpeima, Javad Esmaili & Vahid Javanbakht
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