Abstract
Abstract Mesoporous silica microspheres were prepared by the polymerization-induced colloid aggregation (PICA) and pseudomorphic synthesis methods. The prepared microspheres have high specific surface area and MCM-41 type structure. In the PICA process, acidic silica sol was utilized as silica source and the effect of molar ration (formaldehyde/urea) was investigated. Moreover, the influences of reaction time and temperature were also studied. The specific surface area of porous and mesoporous silica microspheres were 186.4 m2/g and 900.4 m2/g, respectively. The materials were characterized by SAXS, FTIR, SEM, TEM and nitrogen sorption measurements. The prepared silica microspheres were functionalized by (3-Aminopropyl)triethoxysilane and then used to remove the lead from aqueous solution. The result indicates that the grafted silica microspheres have rapid adsorption capacity and good reproducibility. The adsorption data was fitted well with the Langmuir isotherm model, and the maximum adsorption capacities for MCM-41 silica microspheres were 102.7 mg/g.
Highlights
Mesoporous silica microspheres were prepared by the polymerization-induced colloid aggregation (PICA) and pseudomorphic synthesis methods
To prepare ordered mesoporous silica microspheres (MCM41 silica microspheres), the pseudomorphic synthesis method was used to rebuild the pore structure of PSMs
The results demonstrate that the type of lead ion adsorption on functionalized silica microspheres is monolayer fashion
Summary
Abstract: Mesoporous silica microspheres were prepared by the polymerization-induced colloid aggregation (PICA) and pseudomorphic synthesis methods. A variety of functional groups can be grafted or incorporated onto the surface of mesoporous channels to prepare highly effective adsorbents. The porous silica functionalized with various chelating agents have been widely applied as adsorbents, because of its high surface area, large uniform pores and tunable porous sizes. It has good mechanical strength, high thermal stability, stability under a wide pH range and does not swell [10]. Zhao et al successfully prepared mesoporous silica particles by polymerization-induced colloid aggregation (PICA) [28] These particles exhibited good chromatographic performance because of their large surface areas and good monodispersity.
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