草酸根阴离子柱撑水滑石的合成及热稳定性研究  

Synthesis and Thermal Stability of Oxalate-intercalated Hydrotalcites

作　　者：郭军[1] 冯星[1] 李万千[1] 胡传跃[1] 易涛[1] 申湘忠[1] 

机构地区：[1]湖南人文科技学院化学与材料科学系,湖南娄底417000

出　　处：《湖南科技大学学报（自然科学版）》2008年第1期84-89,共6页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(59904001)

摘　　要：采用原位一步合成法和以硝酸根型水滑石为前驱体的水溶液中阴离子直接交换法合成了草酸根柱撑水滑石材料,用XRDI、R和DTA对合成的样品进行了组成和结构表征,在此基础上较为详细地研究了柱撑水滑石样品的热分解行为.研究表明:两种方法均能合成出柱撑水滑石材料,但相比之下,采用原位法合成制备的样品其结晶性和层有序性相对较好.DTA研究表明:Mg2Al系列样品具有比Zn2Al系列样品更高的对热稳定性,但有机阴离子引入水滑石层间,引起层柱材料的热稳定性略微降低,而不同方法合成的柱撑水滑石样品其热稳定性相差不大.图8,参14.Oxalate anions pillared layered double hydroxides（LDHs） were synthesized by in-situ synthetic method and direct ion-exchange reaction in aqueous solution using nitrate-containing LDH as precursors, and were characterized by XRD, IR and DTA. The thermal stabilities of synthesized samples were studied. Results show that the pillared products can be prepared using beth methods, but the sample prepared by in situ synthetic method has higher crystallity and better layered structure than that of the sample prepared by direct anion exchange method. Results from DTA studies indicate that the thermal stabilities of the oxalate-intercalated Mg2A1-LDHs are higher than that of the Zn2A1-LDHs, and the thermal stabilities of the pillared products are slightly decreased with the NO3- ions renlaed by the organo-anions. Less thermal stability differences are observed for the prepared samples via the two different methods.

关 键 词：草酸根 柱撑 水滑石 合成 热稳定性 

分 类 号：O614.22[理学—无机化学]