Synthesis and Characterization of Hybrid Mesoporous Materials Prepared with Triblock-Copolymer and Bridged Silsesquioxane

摘要

In this study functionalized SBA-15 mesoporous silica materials have been synthesized through a simple co-condensation approach of bis-[3-(trimethoxyosilyl)propyl] amine (BTPA) and tetraethyl orthosilicate (TEOS) using xylene like swelling agent, amphihilic triblock-copolymer (PEO-PPO-PEO) Pluronic P123 as structural directing agent under acidic condition, and inorganic salt has been used to improve mesostructure ordering and tailor framework porosity. The influence of amount of BTPA on the structural properties of the resultant materials was investigated. The resultant materials have been characterized by powder X-ray diffraction, FT-IR, ²⁹ Si MAS NMR, ¹³C CP MAS NMR, SEM and elemental analysis. In order to examine the potential of these materials as adsorbents for heavy metals Hg (II) adsorption experiments were also performed. The results from ²⁹ Si MAS NMR and elemental analysis showed that with increasing the amount of BTPA in the synthesis mixture leads to increasing the incorporation of organic groups in the silica framework. Adsorption of Hg (II) ions from aqueous solutions showed high adsorption capacities suggested that these materials have good potential to be used as adsorbents for Hg (II) ions in acid solutions.