期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 51, 期 14, 页码 5216-5223出版社
AMER CHEMICAL SOC
DOI: 10.1021/ie202655x
关键词
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资金
- National Science Foundation for Young Scientists of China [21107076]
- doctoral scientific research foundation of Liaoning Province of China [20111048]
A new surface-ion-imprinted amino-functionalized silica gel sorbent was prepared by the surface imprinting technique with As(V) as the template, 3-(2-aminoethylamino)propyltrimethoxysilane as the functional monomer, silica gel as the support, and epichlorohydrin as the cross-linking agent and was characterized by FTIR, SEM, nitrogen adsorption, and the static adsorption-desorption experiment method. The results showed that the maximum static adsorption capacity of the imprinted silica gel sorbent was 16.1 mg.g(-1), the adsorption equilibrium could be reached in 20 mm, there was no influence of pH values on adsorption capacity of the imprinted silica gel sorbent in the range of 3.7-9.2, and the imprinted silica gel sorbent could be used repeatedly and indicated high selectivity even in the presence of the other metal ions. The Langmuir adsorption model was more favorable than the Freundlich adsorption model. Kinetic studies indicated that the adsorption followed a pseudosecond-order model. Various thermodynamic parameters such as Delta G degrees, Delta H degrees, and Delta S degrees were evaluated with results indicating that this system was a spontaneous and endothermic process.
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