期刊
POLYMER BULLETIN
卷 72, 期 9, 页码 2143-2155出版社
SPRINGER
DOI: 10.1007/s00289-015-1394-4
关键词
Composite hydrogel; Adsorption; Thermodynamic parameters; Mechanism
资金
- National Natural Science Foundation of China [21407125]
- Science And Technology Project from the Ministry of Housing and Urban-Rural Development of the People's Republic of China [2014-K7-007]
- Jiangsu Provincial Natural Science Foundation [BK2012251]
- Key Laboratory for Ecological-Environment Materials of Jiangsu Province [EML201202]
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [AE201069]
In the current study, in situ free radical polymerization was employed to prepare Cu2+-imprinted composite hydrogel (Cu2+-ICH). The cross-sectional morphology of the Cu2+-ICH evaluated by scanning electron microscopy indicated that the copper-loaded Cu2+-ICH became rougher and the pore size of the gel became smaller compared to the unloaded Cu2+-ICH. The ability of the Cu2+-ICH to adsorb Cu2+ from aqueous solutions was assessed using batch adsorption technique. The adsorption capacity increased with the initial concentration of Cu2+, but decreased as the temperature rose from 298 to 318 K. Thermodynamic parameters such as Gibbs free energy (Delta G (0)), enthalpy (Delta H (0)), and entropy (Delta S (0)) for the Cu2+ adsorption were evaluated. It was suggested that the adsorption process was a spontaneous, exothermic process that had positive entropy. Selectivity study indicated that ion imprinting technique resulted in excellent affinity of the Cu2+-ICH toward Cu2+. Finally, the adsorption mechanism was studied by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results indicated that copper adsorption was mainly through interactions with the amine and carbonyl groups.
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