Preparation of magnetic β-cyclodextrin ionic liquid composite material with different ionic liquid functional group substitution contents and evaluation of adsorption performance for anionic dyes

In this study, we successfully prepared two magnetic graphene oxide composites, specifically (mGO(@)ILs(1)-beta CD and mGO(@)ILs(2)-beta CD), with different ionic liquid functional group substitution contents on the 13-cyclodextrin (beta-CD). Structural characterization of the composite material was performed using Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy, specific surface area and pore volume measurements. Comparison of the adsorption performance of the two materials for anionic dyes (lemon yellow (LY), sunset yellow (SY), and ponceau 4R (P4R)) in simulated wastewater. Effect of initial pH value, contact time were studied and discussed in terms of affinity and adsorption efficiency. The adsorption of the anionic azo dye by two adsorbent followed Langmuir adsorption isotherm models and pseudo-second-order kinetics. Noticeably, the maximum adsorption capacity based on the Langmuir model showed that mGO(@)ILs (2)-beta CD was better than mGO(@)ILs(1)-beta CD. Additionally, the adsorbent maintains excellent adsorption capacity after five cycles of adsorption-desorption and has remarkable selective separability. The results showed that the high-density substitution content of the ionic liquid functional groups on beta-cyclodextrin in mGO(@)ILs(2)-beta CD is helpful to improve the adsorption capacity and efficiency.

Automated summary

Two magnetic graphene oxide composites with different ionic liquid functional group substitution contents on beta-cyclodextrin were successfully prepared in this study, with mGO(@)ILs(2)-beta CD showing better adsorption performance. The composite material maintained excellent adsorption capacity after adsorption-desorption cycles and exhibited remarkable selective separability. High-density substitution content of ionic liquid functional groups on beta-cyclodextrin in mGO(@)ILs(2)-beta CD was found to improve adsorption capacity and efficiency.