Article ID Journal Published Year Pages File Type
75607 Microporous and Mesoporous Materials 2010 10 Pages PDF
Abstract

Incorporation of transition metals onto the surface of mesoporous silica via grafting techniques could become a potential strategy for the bottom-up design of sorbents for the removal of pharmaceutical drugs and other emerging contaminants from water sources. Here we report the incorporation of Co2+, Ni2+, or Cu2+ onto the surface of mesoporous SBA-15 via an amino-organic grafting method and the screening of the materials as sorbents for the removal of Naproxen from water. The functionalization procedure involved the reaction of 3-aminopropyltriethoxysilane with OH groups available on SBA-15 surfaces, followed by the anchoring of the desired metal. Removal of traces of sulfates from the metal sources and further metal anchoring were achieved after post-synthesis treatment at alkaline conditions. The resulting metal-modified materials were fully characterized using X-ray powder diffraction, N2 adsorption/desorption isotherms gathered at −196 °C, SEM/EDX, FT-IR, and TGA. Aqueous phase single point adsorption experiments showed that Cu-based materials are good sorbents for the uptake of low-concentration Naproxen at 25 °C and approaching alkaline conditions. The materials uptake capacities decreased as follows: CuNH2_g_SBA-15 > NiNH2_g_SBA-15 > CoNH2_g_SBA-15. In general, the adsorption results correlate well with the observed structural and textural properties of the materials, suggesting also that the metal amino-organic loading is highly dependent on the nature of grafting process and choice of metal.

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Physical Sciences and Engineering Chemical Engineering Catalysis
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