Abstract
An efficient adsorption system was developed for removal of hazardous Direct Blue 71 as a sample azo dye. The γ-Fe2O3@CuO adsorption system was synthesized based on a sol–gel combustion route and characterized by energy-dispersive X-ray (EDX) analysis, X-ray diffraction (XRD) analysis, vibrating-sample magnetometry (VSM), and field-emission scanning electron microscopy (FESEM) techniques. The response surface methodology with Box–Behnken design was used to evaluate the effects of pH, shaking time, and adsorbent dose on dye adsorption. The results showed that solution pH was the parameter with greatest effect on dye adsorption. Adsorption equilibrium was reached quickly, within 8 min. Study of isotherms revealed adsorption capacity of 45.7 mg g−1 according to the Freundlich model. Sorbent regeneration could be performed using methanol–NaOH (0.1 mol L−1) solution.
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Support of this study by the research council of Islamic Azad University, Arak Branch, through grant is gratefully acknowledged.
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Beyki, M.H., Alijani, H. & Fazli, Y. Optimization using response surface methodology for fast removal of hazardous azo dye by γ-Fe2O3@CuO nanohybrid synthesized by sol–gel combustion. Res Chem Intermed 43, 6245–6257 (2017). https://doi.org/10.1007/s11164-017-2987-3
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DOI: https://doi.org/10.1007/s11164-017-2987-3