Preparation, Characterization, and Adsorption Kinetics of Magnetic Chitosan/Nano-Corn Straw Cellulose Composite for the Adsorption of Cr6+

In this study, we have synthesized a novel composite material by integrating corn straw cellulose with magnetic chitosan, resulting in the formation of magnetic chitosan/nano-corn straw cellulose composite (MCS/NCCE). The structure was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses. Using a systematic single-factor experimental design, coupled with a comprehensive investigation into adsorption kinetics and isotherm studies, we have identified the optimal conditions for adsorption efficacy. The adsorption kinetics align with the Sips isotherm model, indicating that the adsorption of Cr⁶⁺ encompasses not only uniform monolayer adsorption but also non-uniform multilayer adsorption. This suggests the presence of multiple active sites on the adsorbent surface. Furthermore, the robustness of the MCS/NCCE was demonstrated through its ability to maintain an adsorption rate of 75% even after four consecutive cycles of use. This study significantly contributes to the valorization of agricultural by-products, such as corn straw, by exploring innovative pathways for their utilization and promoting the circular economy through the recycling of waste materials. The development of MCS/NCCE not only advances the field of environmental science but also aligns with the growing demand for eco-friendly and cost-effective solutions in the management of heavy metal pollution.