A Facile Route to Synthesizing Functionalized Mesoporous SBA-15 Materials with Platelet Morphology and Short Mesochannels

Abstract

A facile synthesis route for preparing SBA-15 silica of platelet shape and very short mesochannels (150-350 nm) was developed by introducing a small amount of Zr(IV) ions in the synthesis solution.The synthesis route can be easily extended to prepare platelet SBA-15 materials with various organic functional groups up to 1.87 mmol/g loading in one pot. In situ XRD and freeze-fracture replication TEM were found to be powerful techniques for studying the self-assembly processes. The platelet SBA-15 with short mesochannels in 150-350 nm was formed because of the fast self-assembly rate of P123 micelles and TEOS accelerated by the Zr(IV) ions in the synthesis solution. The platelet SBA-15 materials are superior to the conventional SBA-15 of rod or fiber morphologies in facilitating molecular diffusion and less possibility of pore blockage when used in the sorption or reactions of bulky molecules.

Adsorption of Pb(II) and Cu(II) metal ions on functionalized large-pore mesoporous silica

“…1-2 lm by adding salts such as KCl and NaCl and keeping the synthesis solution in static condition (Yu et al 2002(Yu et al , 2004Zhao et al 2000). Recently, SBA-15 mesoporous silica with very short mesopore channels in the sub-micrometer scale has also been synthesized (Kosuge et al 2004;Sayari et al 2004;Chen et al 2008Chen et al , 2012Zhang et al 2006;Linton and Alfredsson 2008;Sujandi and Park 2008;Wang et al 2005). These short-channel SBA-15 materials offer significant advantages in the faster rate and the larger capacity for adsorption of bulky molecules, as well as in enzyme immobilization.…”

Expanding mesoporosity of triblock-copolymer-templated silica under weak synthesis acidity

“…One is decreasing the particle size of the mesoporous silica to obtain short mesochannels. For example, Zhang et al [7,8] found that submicrometer-sized SBA-15 with highly ordered short pore channels could be prepared in the presence of some alkanes, and Chen et al [15] synthesized SBA-15 with platelet shape and very short mesochannels by adding small amount of zirconium ions to the synthesis mixture. Another way is to introduce secondary large-dimension porosity to the silica materials in addition to the meosporosity generated from the supermolecular templates.…”

Nanometric palladium confined in mesoporous silica as efficient catalysts for toluene oxidation at low temperature

“…The SC-10 and SC-80 materials are homogeneously dispersed short columns with average pore length of around 450 nm (Fig. 3C-F), a little longer than that of the platelet materials synthesized by Chen et al [13]. The short column morphology is very different from the conventional SBA-15, which possesses rod or fiber morphology (Fig.…”

“…As is known, mesoporous SBA-15 with different morphologies, such as fiber, rope, doughnut, sphere, gyroid and discoid, has been synthesized via different approaches [12]. Recently, a facile synthesis route for preparing SBA-15 type material with novel platelet mesostructure (pore length <350 nm) by introducing a small amount of Zr(IV) ions in the synthesis solution was reported by Cheng et al [13]. These materials may be superior to the conventional SBA-15 in facilitating molecular diffusion and less possibility of pore blockage, especially in the reactions of bulky molecules.…”