In this study, barium ferrite (BaFe12O19) containing metal-chelate microbeads, hard-mag-poly(ethylene glycol dimethacrylate-n-vinyl imidazole) [h-mag-poly(EGDMA–VIM)] (average diameter 53–212 μm), were synthesi- zed and characterized. Their usage as an adsorobent in removal of Cr(VI) ions from aqueous solutions was investigated. The h-mag-poly(EGDMA–VIM) microbeads were prepared by copolymerizing of ethylene glycol dimethacrylate (EGDMA) with n-vinyl imidazole (VIM) and were characterized by elemental analysis, scanning electron microscopy, X-ray powder diffractometry vibrating magnetization measurements and swelling studies. The adsorption potential of microbeads for Cr(VI) ions from aqueous solutions was investigated. They exhibited the highest Cr(VI) ions adsorption capacity at pH 2.0 and adsorbent dosage of 50 mg. To predict the adsorp- tion isotherms and to determine the characteristic parameters for process design, seven single and two para- meter isotherm models were applied to experimental data. Three error analysis methods were used to evaluate the experimental data. Correlation coefficient, standard error, and sum of squares error of the estimate were to find the best fitting isotherm.
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