对苯二甲酸柱撑水滑石的组装及其结构特征

Assembly and Structural Characterization of Terephthalate-pillared Hydrotalcites

以水滑石 Mg4Al2 (OH) 12 CO3· 4H2 O为前体 ,以乙二醇为介质 ,用离子交换法制备了对苯二甲酸柱撑水滑石 Mg4Al2 (OH) 12 [C6 H4(COO) 2 ],并用 XRD、FT-IR、DTA测试技术对样品进行了表征 .结果表明 ,通过控制离子交换条件 ,[C6 H4(COO) 2 ]2 -可以完全取代水滑石层间的 CO2 -3;柱撑水滑石具有良好的层状结构 ,由于离子交换温度的不同 (70～ 1 5 0℃ ) ,其层间距略有变化 (1 .3 8～ 1 .45 nm) ;柱撑水滑石层间的 [C6 H4-(COO) 2 ]2 -在 5 5

Terephthalate pillared hydrotalcites, Mg 4Al 2(OH) 12 [C 6H 4(COO) 2] , were successfully synthesized through Mg 4Al 2(OH) 12 CO 3·4H 2O precursor in an organic solvent by ion exchange. The samples thereby obtained were characterized by XRD, FT IR and DTA. The results show that the initial interlayer carbonates of the hydrotalcite can be completely replaced by terephthalic anions under special controlled conditions. The pillared hydrotalcites have good layered structure and the interlayer distance varies slightly (1 38~1 45 nm) with the exchange temperature (70~150 ℃). The interlayer terephthalic anions decompose at about 553 ℃.