Diatomite cross-linked β-Cyclodextrin polymers: A novel vision of diatomite adsorbent for the removal of bisphenol A

• Published in: Environmental technology & innovation Vol. 23; p. 101602
• Main Authors: Shi, Shengli, Ocampo-Pérez, Raul, Lv, Junping, Liu, Qi, Nan, Fangru, Liu, Xudong, Xie, Shulian, Feng, Jia
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2021
• Subjects: Adsorption; Bisphenol A; DA@[formula omitted]-CD polymers; Mass transfer simulation; Removal mechanism; Mass transfer simulation; Bisphenol A; Removal mechanism; Adsorption; DA@β-CD polymers
• ISSN: 2352-1864; 2352-1864
• DOI: 10.1016/j.eti.2021.101602

In this study, a novel environmentally friendly diatomite-cross-linked​ β-Cyclodextrin (DA@β-CD) adsorbent was synthesized by a one-step synthesis method for the removal of bisphenol A (BPA). The synthesized DA@β-CD exhibits higher removal capacities for BPA than DA, which is 1.4 to 2.5 times of DA. The factors of influencing DA@β-CD removal capacities, such as the dosage of DA@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 DA@β-CD system may be coordinated by three adsorption type pathways. Furthermore, the DA@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 DA@β-CD has the potential for practical applications as a green and environmentally friendly adsorbent. [Display omitted] •Novel DA@β-CD was prepared by a one-step synthesis method.•The composite of DA@β-CD exhibited a greater removal ability of BPA than DA under the same conditions.•Adsorption kinetics and mass transport of BPA were simulated by some mathematic models.•The adsorption mechanism and pathways of BPA in the DA@β-CD were proposed.