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Removal of Copper Ions From Water Using Epichlorohydrin Cross-Linked β-Cyclodextrin Polymer: Characterization, Isotherms and Kinetics

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β-cyclodextrin (β-CD) cross-linked with epichlorohydrin to form water insoluble β-cyclodextrin polymer (β-CDP) has been shown to be an effective sorbent for sorption of organic particles, but the sorption of copper (Cu2+) in aqueous solutions by β-CDP has not been conducted. The objective of this study was to explore the sorption mechanism of β-CDP for copper. The effects of different experimental conditions such as pH, ionic strength, contact time, and temperature were inspected using a batch method. In addition, binding scheme was estimated by using Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), a scanning electron microscope (SEM), and Brunauer-Emmett-Teller (BET) analysis. The adsorption of Cu2+ was observed to be higher at pH 6.0. The kinetic study revealed that the adsorption is fitted well by the pseudo-second-order kinetic model. The maximum binding of Cu2+ was estimated to be 111.11 mg/g through the Langmuir isotherm model — much higher than the existing sorption technologies. Hence, the adsorption-desorption trends of epichlorohydrin cross-linked with β-CD, along with its good recyclability, establish an alternative, effective, and novel remediation technology for the removal of Cu2+ from aqueous solutions.
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Keywords: copper adsorption; epichlorohydrin; kinetics; water pollution; β-cyclodextrin

Document Type: Research Article

Affiliations: Environmental Adaptation Science, Division of Environmental Science Development, Graduate School of Environmental Science, Hokkaido University, 060-0810 Sapporo, Japan

Publication date: 01 April 2014

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