摘要
利用低角度X射线衍射分析、红外光谱、比表面积及孔结构分析,研究铁柱撑蒙脱石的结构特性,结果显示:经柱撑处理后的蒙脱石以层离结构为主,同时含有部分柱撑蒙脱石结构。前者为粘土片层与铁离子水解产生的聚合羟基铁的簇状物堆垛而成的卡房状孔结构,与XRD图上低角度衍射峰对应;后者则与(001)衍射峰对应。与柱撑结构不同,层离结构中,大量阴离子(NO3-)能够作为平衡铁水解聚合物正电荷的反离子而较稳定地存在,研究还发现铁层离-柱撑蒙脱石具有作为新型催化剂、吸附剂应用的前景。
Iron oxide pillared clay was synthesized by the reaction of montmorillonite with basehydrolyzed solutions of nitrate salt of Fe（Ⅲ） salts. In contrast with the classical PILCs structure with intercalation of metal irons hydrolysis product, based on the analyses of powder X-ray diffraction （XRD）,nitrogen adsorption-desorption isotherms and Fourier transform infrared spectroscopy （FTIR）,a resultant iron-clay with novel meso-microporous delaminated structure containing pillared fragments was recognized. One high d spacing beyond 6.4 nm and another d spacing of ca, 1.5 nm are observed in the XRD patterns of resultant iron-clays. The former is assigned to the distribution of pores in the delaminated structure rather than the （001） reflection of periodic structure of intercalation and the latter d spacing of ca. 1. 5 nm corresponds to the intercalation of primary hydrolysis product of Fe（ Ⅲ ）, Considerable NO3 is found to be retained in the mesoporous delaminated structure to neutralize the positive charge of iron aggregate. The resultant delaminated pillared clay is of prospects in the field of novel heterogeneous catalysts and adsorbents.
出处
《矿物岩石》
CAS
CSCD
北大核心
2005年第3期37-40,共4页
Mineralogy and Petrology
基金
中科院广州地球化学所知识创新工程领域前沿项目(批准号:GIGCX-04-02)
广东省自然科学基金(批准号:04002140)
关键词
蒙脱石
层离结构
柱撑结构
柱撑粘土
montmorillonite
pillared structure
delaminated structure
PILCs
