Abstract
In this study, a novel environmentally friendly diatomite-cross-linked β-Cyclodextrin ([email protected]β-CD) adsorbent was synthesized by a one-step synthesis method for the removal of bisphenol A (BPA). The synthesized [email protected]β-CD exhibits higher removal capacities for BPA than DA, which is 1.4 to 2.5 times of DA. The factors of influencing [email protected]β-CD removal capacities, such as the dosage of [email protected]β-CD, the pH, and temperature were investigated. Adsorption isotherms and kinetics followed the Langmuir (Radj2=0.9942) and fitted well with pseudo-second-order (Radj2=0.9995–0.9999) and Langmuir-type kinetic models (Radj2=0.9825–0.9984). The intraparticle diffusion and external mass transfer models (EMTM) indicated that the mass transfer of BPA was controlled by external mass transport. The mechanism of removal of BPA in the [email protected]β-CD system may be coordinated by three adsorption type pathways. Furthermore, the [email protected]β-CD is stable and easy to regenerate with the alkaline solution, and the removal is maintained at 91.15% after three cycles. These results demonstrated that the [email protected]β-CD has the potential for practical applications as a green and environmentally friendly adsorbent.
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