ABSTRACT In the current study, a newly developed magnetic nanoadsorbent based on β‐cyclodextrin metal‐organic framework (Fe 3 O 4 @SiO 2 ‐β‐CD‐MOF) was fabricated and utilized as an efficient nanoadsorbent for the removal of Malachite green (MG) and Methyl violet (MV) dyes from aqueous solutions. The Fe 3 O 4 @SiO 2 ‐β‐CD‐MOF was characterized using various techniques such as FT‐IR, XRD, FESEM, EDS, and BET. Based on the BET method, the specific surface area of Fe 3 O 4 @SiO 2 ‐β‐CD‐MOF was found to be 98.6 m 2 /g. The main parameters, such as adsorbent dosage, temperature, contact time, pH value, and initial dye concentration, which could affect the adsorption process, were investigated. Moreover, the regeneration of the adsorbent was explored in six cycles. The dye adsorption kinetics, thermodynamics and isotherms were also studied. The obtained results indicate that the pseudo‐second‐order kinetic model and the Langmuir isotherm accurately describe the dye adsorption process on the Fe 3 O 4 @SiO 2 ‐β‐CD‐MOF. In addition, the maximum adsorption capacities for MG and MV were measured to be 229.02 and 180.49 mg/g, respectively. The R L values were below 1.0, which reveals that the adsorption of MG and MV was favorable. Additionally, the calculated enthalpy changes (ΔH°) revealed that the adsorption was endothermic for MV (positive ΔH°) and exothermic for MG (negative ΔH°).
Hanifehpour et al. (Fri,) studied this question.