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Updated: Feb 15, 2026

A Facile and Efficient Approach for the Production of Reversible Disulfide Cross-linked Micelles
Published on: December 23, 2016
Characterization of EDTA-cross-linked β-cyclodextrin grafted onto Fe-Al hydroxides as an efficient adsorbent for
Ningning Liu1, Yunhai Wu1, Haitao Sha2
1Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Ministry of Education, Hohai University, Xikang Road #1, Nanjing 210098, China.
Abstract:
The synthesis process of Fe-Al hydroxides coated with ethylenediaminetetraacetic acid (EDTA)-cross-linked β-cyclodextrin polymer (FA-ECD) and its utilization in the adsorption of methylene blue (MB) were investigated. The FA-ECD before and after adsorption was characterized by scanning electron microscopy (SEM), Brunauer-Emmet-Teller (BET) analysis, Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric (TG) analysis, and X-ray diffraction (XRD). In addition, the EDTA and β-cyclodextrin contents were determined quantitatively. The optimization of several variables such as contact time, pH, initial concentration, and adsorbent dosage achieved the maximum removal percentages in mild conditions. The results revealed that the adsorption process mainly depended on the pH value and the optimal adsorption capacity of the MB was 60.71 mg/g at pH 8. Subsequently, the experimental equilibrium data at different temperatures were fitted with the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models; the Freundlich model provided the best results. In addition, the pseudo-second-order kinetic model best described the adsorption of the MB. The thermodynamic analysis proved that the adsorption process was endothermic and spontaneous.
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