Highly ordered metal ion imprinted mesoporous silica particles exhibiting specific recognition and fast adsorption kinetics
2013; Royal Society of Chemistry; Volume: 1; Issue: 24 Linguagem: Inglês
10.1039/c3ta10761b
ISSN2050-7488
AutoresChengcheng Kang, Weiming Li, Lei Tan, He Li, Chaohai Wei, Youwen Tang,
Tópico(s)Adsorption and biosorption for pollutant removal
ResumoWe prepared highly ordered metal ion imprinted mesoporous silica (IIMS) through co-condensation using a combination of molecular imprinting technology and traditional mesoporous materials. Copper ion is used as the template. Besides the periodic hexagonal structure, nano-sized wall thickness, and large surface area, it is found that the IIMS has highly specific recognition ability for the template. The imprinting factor of IIMS exhibits a maximum value of 3.7 at pH 2.5. The material shows fast binding kinetics for Cu2+ (complete equilibrium reach only within 5 min) and the saturation adsorption capacity reaches up to 0.39 mmol g−1. Homogeneous binding sites are confirmed by the Langmuir isothermal model and the Langmuir–Freundlich isothermal model. The heterogeneity index is 0.992 with a value similar to those found for molecularly imprinted polymers prepared using covalent imprinting. The recovery of the silica stays above 90% after six extraction–stripping cycles. Furthermore, the silica has significant potential for water treatment applications.
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