Article ID Journal Published Year Pages File Type
237275 Powder Technology 2012 6 Pages PDF
Abstract

Mesoporous silica SBA-15 was synthesized for controlled release applications of the natural antibacterial, allyl isothiocyanate (AITC). Two different molar ratios of silica were used as 1.00 (SBA-15a) and 0.74 (SBA-15b). This 26% reduction gave the same parallel-sided cylindrical pore shapes, but increased the mean pore width 38% and pore volume 37%. Adsorption of AITC from vapor phase resulted in liquid adsorbed phase, confirmed by Fourier transform infrared spectroscopy. Both silica samples were filled to 100% capacity, with SBA-15b having a 39 mass% increase in amount adsorbed. More than 50% of the adsorbed phase was released by both samples in the first 12 h, with the desorption rate from SBA-15a > SBA-15b. After 24 h, the amount desorbed approached a maximum with 94% from SBA-15a and 87% from SBA-15b. Both sets of experimental desorption data were well-correlated by a diffusion from a plane sheet model incorporating intraparticle porosity. An effective diffusion coefficient for AITC was extracted from the model for SBA-15a as 4.40 × 10− 16 m2/s, and 3.00 × 10−16 m2/s for SBA-15b, a 32% decrease.

Graphical abstractSchematic showing parallel nature of SBA-15 pores with adsorption and controlled release of AITC.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Preparation of two types of SBA-15 giving uniform, parallel mesopores. ► Allyl isothiocyanate (AITC) is a naturally available antibacterial for food preservation. ► Adsorption capacity for AITC identified. ► Desorption as controlled release profile defined and modeled for both AITC-SBA-15 systems.

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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