Urea-Containing Mesoporous Silica for the Adsorption of Fe(III) Cations
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Abstract
A urea-containing mesoporous silica with intraframework urea groups (UreaMS) was synthesized via a surfactant-templated route by co-condensation of an organosilane precursor and tetraethoxysilane. The material possesses hexagonal pores with a high degree of uniformity and shows long-range order as confirmed by the measurement of powder X-ray diffraction and N2 adsorption isotherms. A detailed characterization by chemical analysis, 29Si MAS NMR, X-ray photoelectron spectroscopy, thermogravimetric analysis, and FT-IR spectroscopy confirmed the integrity of urea groups inside the walls of the material. The results revealed a density of one urea group per ca. 13−16 silicon atoms. The efficiency of UreaMS for the adsorption of Fe(III) cations was tested. A distribution coefficient of Kd = 700 mL g-1 and an adsorption capacity of 0.19 mmol g-1 were determined. X-ray photoelectron spectroscopy confirmed the conservation of the oxidation state +3 for the iron within the mesoporous silica material.
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