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FAST SEPARATION OF SULFANILAMIDES USING MACROPOROUS SILICA SPHERES AS THE SEPARATION MEDIA

One of the outstanding challenges in the field of porous materials is the design and synthesis of hierarchical porous structures with fast mass transport efficiency. Here, a kind of macroporous silica particles was synthesized by phase separation and sol-gel transition in emulsion media. After proper post-treatment, the silica microspheres with high mechanical strength can be attained. The silica microspheres thus obtained were characterized by scanning electron microscope and nitrogen sorption measurement. It can be found that hierarchically porous structure of macropores and mesopores, and high surface area (up to 256 m2 g−1) was characterized. After modification with octadecyl trichlorosilane, its application in fast reversed-phase chromatography was demonstrated. Seven aromatic hydrocarbons and six sulfonamide analytes were baseline separated respectively within 6 min at a high flow rate of 5 mL/min.