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The preparation of thin-walled multi-cavities β-cyclodextrin polymer and its static and dynamic properties for dyes removal

Chen, Jianxin, Liu, Mengling, Pu, Yunping, Wang, Chongbin, Han, Jian, Jiang, Minghuang, Liu, Kaili
Journal of environmental management 2019 v.245 pp. 105-113
Fourier transform infrared spectroscopy, absorptivity, adsorption, beta-cyclodextrin, gentian violet, heavy metals, ionic strength, kinetics, metal ions, models, nanoparticles, pH, polymerization, polymers, scanning electron microscopy, silica, sorption isotherms, temperature, transmission electron microscopy
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 (R2) of pseudo-second-order kinetic model reached 0.9984 and the adsorption isotherm was closer to the Langmuir model. As the temperature increased, the R2 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.