Urea-Containing Mesoporous Silica for the Adsorption of Fe(III) Cations
Urea-Containing Mesoporous Silica for the Adsorption of Fe(III) Cations
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DOI：
10.1021/cm061287n
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发表时间：
2006-10
影响因子：
8.6
通讯作者：
Míriam Benítez;D. Das;R. Ferreira;†. A. Uwe Pischel;H. García
中科院分区：
文献类型：
--
作者：
Míriam Benítez;D. Das;R. Ferreira;†. A. Uwe Pischel;H. García
以有机硅烷前驱体与四乙氧基硅烷共缩聚为原料，采用表面活性剂-模板法制备了一种具有框架内脲基的含脲介孔二氧化硅（UreaMS）。粉末x射线衍射和N2吸附等温线的测量证实，材料具有均匀度高的六方孔，且具有长程有序。通过化学分析、29Si MAS NMR、x射线光电子能谱、热重分析和FT-IR光谱进行了详细的表征，证实了材料壁内尿素基团的完整性。结果表明，每13−16个硅原子的密度为1个尿素基团。考察了脲胺对Fe（III）阳离子的吸附效率。分配系数为Kd = 700 mL g-1，吸附量为0.19 mmol g-1。x射线光电子能谱证实了介孔二氧化硅材料中铁的氧化态+3守恒。
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.