The preparation of thin-walled multi-cavities β-cyclodextrin polymer and its static and dynamic properties for dyes removal. (1st September 2019)

• Record Type: Journal Article
• Authors: Chen, Jianxin; Liu, Mengling; Pu, Yunping; Wang, Chongbin; Han, Jian; Jiang, Minghuang; Liu, Kaili
• Is Part Of: Journal of environmental management. Volume 245(2019)
• Page Start: 105
• Page End: 113
• Publication Date: 2019-09-01
• Subjects: Hβ-CDs -- Dyes removal -- Ionic strength -- Desorption-regeneration -- Fixed-bed; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2019.04.125
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Thin-walled multi-cavities β-cyclodextrin polymers (Hβ-CDs) were prepared by the suspension polymerization method using SiO2 nanoparticles as a template. The components and morphology structure of Hβ-CDs were characterized by FTIR, BET, SEM, and TEM. The adsorption performances of the prepared nano-adsorbent Hβ-CDs on crystal violet (CV), heavy metal ions, some cationic, neutral, and anionic dyes were investigated. The influences of the pH and ionic strength on CV adsorption by the Hβ-CDs were explored. The correlation coefficient ( R 2 ) of pseudo-second-order kinetic model reached 0.9984 and the adsorption isotherm was closer to the Langmuir model. As the temperature increased, the R 2 of the Freundlich isotherm model rose. Compared to anionic ones and heavy metal ions, Hβ-CDs had a better adsorption efficiency for cationic dyes. Dynamic adsorption also indicated the thin-walled multi-cavities structure was beneficial for improving absorptivity and application of β-cyclodextrin polymers. In addition, the Hβ-CDs exhibited potentially applicable for the regeneration and reuse with the removal efficiency of CV was as high as 89% in the fourth cycle. Graphical abstract: Image 10123 Highlights: Thin-walled multi-cavities β-CD polymers were successfully structured and prepared. Static and dynamic adsorption indicted the effect of the thin-walled multi-cavities structure for β-CD polymers. High ionic strength was beneficial to dyes adsorption. Adsorption-degradation cycles were successfully designed.