Abstract
Abstract Mesoporous silica functionalized with (3-aminopropyl)trimethoxysilane was used as a selective adsorbent for free fatty acids (FFAs) and chlorophyll in olive oil. A series of mesoporous silica with 2, 5 and 10 nm pore diameters was modified with 3-aminopropyltrimethoxysilane via a post-synthetic reaction. The structural characteristics were confirmed by powder X-ray diffraction, electron microscopy and nitrogen-sorption analyses, and the adsorption capacity, selectivity, composition and thermal stability of olive oil were investigated. The adsorption of FFAs and chlorophyll depended on the surface functionalization and pore size, respectively. We discovered that aminopropyl-functionalized silica with a 5 nm pore size selectively adsorbed FFAs and chlorophyll without adsorbing other ingredients and changing the fatty acid composition ratio. The adsorption results obtained using regenerated silica also showed that this material can be used several times without severe performance degradation.
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