水滑石材料再水合性能的研究

Reconstruction property of the hydrotalcite-like compounds

采用共沉淀法制备了碳酸根型和硝酸根型镁铝水滑石材料,同时制备了2种类型的钡掺杂水滑石,研究了以上4种水滑石材料焙烧后混合氧化物的再水合性能以及钡离子存在对水滑石再水合性能的影响,发现硝酸根型水滑石较碳酸根型水滑石难重构,并对重构能力的区别进行了探讨;钡掺杂的硝酸根型水滑石实际引入的钡很少,表现出和硝酸根型水滑石相同的衍射峰,但材料的再水合性能降低。

Hydrotalcites （HTs） intercalated by nitrate and by carbonate, respectively, are synthesized with coprecipitation method. Barium incorporated HTs of these two kinds are prepared. The reconstruction ability of these four HTs is studied. The results show that the nitrated hydrotalcite cannot be reconstructured to its original structure. Most of the barium can be washed out in the Ba-modified nitrated hydrotalcite. As a result, it shows the same pattern of nithated hydrotalcites. Compared with the unmodified mixed oxide, the mixed oxide derived from Ba-incorporated nitrated hydrotalcite exhibits lower reconstruction ability.