Nanoparticles Composed of β-Cyclodextrin and Sodium p-Styrenesulfonate for the Reversible Symmetric Adsorption of Rhodamine B

Nanomaterials have been extensively employed for the efficient removal of the cationic dye rhodamine B (RhB) from aqueous solutions. However, challenges such as complex synthesis processes, limited adsorption capacity, and poor cycling stability remain to be addressed. In this research, a novel nanoparticle-based β-cyclodextrin and sodium p-styrenesulfonate composite (M-β-SCDP) was synthesized via a two-step method to enhance its adsorption capabilities for RhB from water. The modification resulted in a material enriched with active sites (−OH, −SO3−) and a mesoporous structure, greatly enhancing its adsorption capacity to 2392.34 mg·g−1 for RhB removal from water solutions. The M-β-SCDP exhibited excellent reversible symmetric adsorption, which remained stable after 10 regeneration cycles with no loss in adsorption capacity. The simple manufacturing process, along with its effective adsorption capabilities and outstanding reusability, indicates that M-β-SCDP has great potential for real-world use in efficiently treating RhB in water.