铁盐水解法制备铁层柱蒙脱石及其结构特性研究  

Investigation on the Delaminated Iron-Pillared Montmorillonite Synthesized by Base-hydrolyzed Fe(Ⅲ) Nitrate Method

作　　者：袁鹏[1] 杨丹[1] 陶奇[1] Fa■za Bergaya 何宏平[1] 朱建喜[1] 周琴[1] 

机构地区：[1]中国科学院广州地球化学研究所 [2]Centrede Recherche sur la Matière Divise,CNRS-Universitd'Orlans,rue de La Frollerie,Orlans Cedex245071

出　　处：《矿物岩石地球化学通报》2007年第2期111-117,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：广东省自然科学基金资助项目(04002140;5006267)

摘　　要：利用低角度X射线衍射、红外光谱、喇曼光谱及孔结构分析,研究了用铁盐水解法制备的铁层柱蒙脱石的结构与性质。所制得的铁层柱蒙脱石以介孔型层离结构为主,微孔型柱撑结构为辅。前者为蒙脱石片层与铁离子水解产生的聚合羟基铁簇合物堆垛而成的卡房状结构,与d值为6.4±1.0nm的X射线衍射宽峰相对应;微孔型柱撑结构则与d值约1.5nm的(001)衍射峰相对应。所合成的系列铁层柱蒙脱石中最大的比表面积和孔容分别为215.7m2/g和0.291mL/g。500℃热处理后,仍保存铁层柱蒙脱石的介孔结构。铁层柱蒙脱石富含阴离子(NO3-),并作为平衡铁水解聚合物正电荷的反离子而稳定存在,可为磷钨酸离子[PW12O40]3-所交换。铁层柱蒙脱石的新型结构和特殊性质在催化剂、载体与吸附剂等领域具新的应用前景。Iron pillared montmorillonite samples were synthesized by the reaction between montmorillonite clays and base-hydrolyzed solutions of Fe（Ⅲ） nitrate. Rather than the classical microporous pillared structure, a meso-microporous delaminated structure containing pillared fragments was shown in the resulting iron-pillared clays. One broad XRD peak with large d-spacing of 6.4± 1.0 nm exhibited as an indicator of the mesoporous delaminated part, whereas another peak with d-spacing of ca. 1.5 nm was indicative of the microporous pillared part. A considerable amount of NO3^- was retained in the delaminated iron-pillared clays even after thoroughly washing by successive agitations/centrifugations. With their content positively correlating with the content of the iron species in the iron-pillared clays, the NO3^- anions played as counterions to neutralize the positive charges of iron aggregates in the delaminated structure, and they shown exchangeability with heteropolyanions [PWI12O40]^3-. The surface area and porosity of the resultant delaminated iron-pillared clays were found to be mainly resulted from mesopores in the de- laminated structure, and the highest BET specific surface area and the largest porosity obtained are 215.7 m^2/g and 0.291 mL/g, respectively. The mesoporosity was mostly preserved in the delaminated iron-pillared montmorillonite calcined at 500 ℃. Above fundamental results, on the basis of a comprehensive analyse of powder X-ray diffraction （XRD）, nitrogen adsorption-desorption isotherms, Fourier transform infrared spectroscopy （FTIR） and Raman spectroscopy （Raman）, indicate that the delaminated iron-pillared montmorillonite shows prospective applications in the fileds of heterogeneous catalysts, support and adsorbents.

关 键 词：蒙脱石 层离结构 柱撑结构 柱撑粘土 

分 类 号：P579[天文地球—矿物学]