铁掺杂方沸石的合成及其磁性化

采用水热合成法, 按摩尔比n(SiO2):n(Al2O3):n(Na2O):n(Fe3+):n(H2O)=2.3:1:3.9:(0.02, 0.04, 0.08):185配料, 三乙胺为模板剂, 草酸为铁离子的络合剂, 经过室温搅拌成胶, 170 ℃下于不锈钢反应釜晶化60 h, 合成了三种掺杂铁量不同的方沸石, 为了解决粉末沸石分子筛难以从使用料液中分离问题, 对合成铁掺杂方沸石700 ℃下进行氢气还原制得了磁性沸石. 利用X射线衍射(XRD)、傅立叶变换-红外(FT-IR)光谱和扫描电子显微镜(SEM)对制得的产品进行表征. 结果表明, 合成的铁掺杂方沸石与纯方沸石结构相同, 磁性化沸石结构发生了变化. 考察样品对水中氟离子和铅离子的吸附性能发现, 铁掺杂方沸石和磁性沸石对它们的吸附性能没有促进作用.

Synthesis of Iron-Doped Analcime and Its Magnetic

Using triethylamine as a template and acetic acid as a complexing agent for ferric iron, three analcimes with different iron concentrations were synthesized by a hydrothermal synthesis method according to the following procedure: a mixture with mole ratios of n(SiO2):n(Al2O3):n(Na2O):n(Fe3+):n(H2O)=2.3:1:3.9:(0.02, 0.04, 0.08):185 was prepared and stirred for 5 h at roomtemperature and then crystallized for 60 h at 170 ℃ in a stainless steel reaction pot. To address the problem of powdered zeolite separation from the disposed solution, a series of magnetic zeolites were synthesized by deoxidizing the iron-doped analcimes at 700 ℃. The crystalline structure was characterized by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, and scanning electron microscope (SEM). Results suggested that iron-doped analcimes had an equivalent structure to pure analcime but that the structure of magnetic zeolites was different. Their adsorption to fluorinion and lead ions in water was studied and it was found that iron-doped analcimes and magnetic analcimes showed no promoting effect on adsorption of these ions.