层状磷酸盐在有机胺溶液中的胶体化和稳定性研究  

Studies on Colloidization and Stability of Layered Phosphates in Amine Hydrous Solution

作　　者：徐金锁[1] 唐颐[1] 张华[1] 高滋[1] 

机构地区：[1]复旦大学化学系,上海200433

出　　处：《高等学校化学学报》1997年第1期93-98,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：系统地研究了层状磷酸铁（α－ZrP）、磷酸锡（α－SnP）和磷酸钛（α－TiP）在有机腹水溶液中的胶体化（即层板剥离）和水解状况．发现磷酸盐在有机胶嵌入而胶体化的同时，层板表面的HPO42-和金属离子发生水解而脱离，HPO42-的脱离先于金属离子，HPO42-水解度超过40％则磷酸盐层状结构破坏严重．在相同的有机腹溶液中，不同磷酸盐的水解和胶体化状况不同，其中磷酸钛的水解最严重，层板最难打开，在保持层板结构的前提下很难完全胶体化；磷酸锡的水解程度居中，层板较易打开，胶体化效果及层极稳定性均优于磷酸钛；磷酸锆的层板最不容易水解，其结构最稳定，也较易实现肢体化．对不同的磷酸盐可选择不同的有机股和实验条件，以控制层板的水解和胶体化，达到所需要的制备目的．The colloidization (exfoliation ) and hydrolysis of layered zirconium phosphate (α-ZrP-R), tin phosphate (α-SnP-R ) and titanium phosphate (α-Tip-R ) were investigated systematically. When the phosphate sheets exfoliate, HPO42- and M4+ (M = Zr, Sn, Ti )leave the sheet surface and enter tl1e solution through hydrolysis. The hydrolysis of HPO42-takes place before the loss of M4+, and as the hydrolysis extent of HPO42- exceeds 40%, the layered structure of the phosphates will be destroyed. The colloidization and hydrolysls de-gree of the three phosphates in the same amine solutlon differ from each other. The sheets of α-TiP-R hydrolyze readily and exfoliate wlth difficulty. In most cases the ex foliation of α-TiP-R occurs only around the boundary of its sheets, and the complete exfoliation is hardly observed. The sheets of α-SnP-R are more stable than those of α-TiP-R. They hydrolyze less readily and exfoliate more easily. The sheets of α-ZrP-R are most stable toward hydrolysis and exfoliate easily in amine solution. For each kind of layered phosphates the adoption of an appropriate amine and suitable experirnental conditions are necessary to control the hydroly-sis and exfoliation of the phosphate sheets during preparation of various types of pillared phosphates or multifunctional films.

关 键 词：层状 磷酸盐 胶体化 稳定性 有机胺 

分 类 号：O648.1[理学—物理化学]