Russian Journal of Applied Chemistry

, Volume 91, Issue 11, pp 1856–1866 | Cite as

Biochar-Based Magnetic Nanocomposite for Dye Removal from Aqueous Solutions: Response Surface Modeling and Kinetic Study

  • A. A. Akbarnezhad
  • F. SafaEmail author
Sorption and Ion Exchange Processes


In this study, a biochar-based magnetic nanocomposite (BMNC) was synthesized and employed as adsorbent for Eriochrome Black T (EBT) removal from aqueous solutions. The biochar was prepared from oleaster stones and composited with iron oxide nanoparticles produced through chemical co-precipitation technique. The magnetic nanocomposite was characterized by X-ray diffraction analysis, Fourier transform infrared spectrometry, and scanning electron microscopy. The experiments were carried out using the Box-Behnken experimental design (BBD) with four input variables of adsorbent dosage (0.4–2.4 g L–1), solution pH (3–9), contact time (30–50 min), and ionic strength (0.02–0.1 M). An initial EBT concentration of 50 mg L–1 was taken as the fixed input parameter. Regression analysis resulted in a quadratic response surface model whose statistical significance was verified by analysis of variance. The model predicted the optimum conditions for EBT removal from aqueous solution (adsorbent dosage of 2.29 g L–1, pH 3.39, contact time of 48.6 min and ionic strength of 0.1 M) and removal efficiency of 98.11% was achieved. Results of the study showed that the dye adsorption onto the magnetic nanocomposite followed the pseudo-second order kinetic model.


adsorption biochar magnetic nanocomposite Box-Behnken design kinetics 


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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Department of ChemistryRasht Branch, Islamic Azad UniversityRashtIran

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