(CNT)/Fe3 O4 were synthesized as a promising magnetic material for the pre-concentration and separation of Cr(III) from aqueous solutions. The results of Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) con- firmed that β-CDTs is grafted onto CNT/ Fe3 O4 nanoparticles. Batch adsorption experiments were carried out to determine the effect of various parameters: i.e., the initial metal ion concentration, pH, contact time and dose of adsorbent. Four factors and three levels—according to the Taguchi’s (L 16 ) orthogonal array— were used to assess and optimize the adsorption conditions. The Langmuir, Freundlich and Temkin iso- therms have been used to analyze the experimental equilibrium data. The experimental results were compared to equilibrium isotherm equations, Langmuir isotherm was found to have the best fit. The obtained results suggest strong practical applications of β-CDTs modified carbon nanotube (CNT)/Fe3O 4 with different nanomaterials used as sensors, novel adsorbents and also in drug delivery and catalysis.
