Novel High-efficiency adsorbent consisting of magnetic Cellulose-based ionic liquid for removal of anionic dyes

Abstract

Exploiting a high-efficiency and environmental-protection absorbent to catch organic dyes from aqueous solution is a practical exploration to carry out the vision of Green and Sustainable Development. In this paper, we studied a functionalized porous magnetic cellulose-based ionic liquid adsorbent (FSIL@CP) to rapidly and vastly uptake anionic dyes. The FSIL@CP composites consisted of two parts, namely synthesis of Fe3O4 nanoparticles grafted by imidazole ionic liquid and subsequent formation of porous magnetic cellulose microspheres modified by amino-rich polyethyleneimine. The structure of FSIL@CP was characterized by SEM, TEM, XRD, XPS, BET, TGA, VSM and FTIR. The adsorption performances of the FSIL@CP towards anionic dyes were evaluated via the experiments of various influence factors, adsorption kinetics, isotherm and thermodynamics. The maximun adsorption capacities for Congo red (CR) and Methyl blue (MB) reached 1299.3 and 1068.1 mg g−1, respectively, which is better than other similar adsorbents reported in the literature. The adsorption kinetics and isotherm models were well-fitted to pseudo-second-order model and Langmuir isotherm, and the adsorption process followed multiple-stage intraparticle diffusion with spontaneous feature. The adsorbent can be rapidly and easily separated from aqueous solution under external magnetic field. The regeneration performance of the adsorbent is excellent and could be repeatedly used. From the results, the FSIL@CP adsorbent offers an effective, inexpensive and reusable/sustainable system for removal and remediation of anionic dyes such as CR and MB in dye wastewater.