Yu Miao, Li Haiping, Du Na, Hou Wanguo
Key Laboratory for Colloid and Interface Chemistry (Ministry of Education), Shandong University, Jinan 250100, PR China.
National Engineering Research Center for Colloidal Materials, Shandong University, Jinan 250100, PR China.
J Colloid Interface Sci. 2019 Jul 1;547:183-189. doi: 10.1016/j.jcis.2019.03.101. Epub 2019 Mar 30.
In the current work, Li-Al-CO layered double hydroxides (LDHs) were synthesized by a hydrothermal method using LiCl, AlCl, and urea as raw materials. The effect of LiCl/AlCl molar ratio (R) on the composition of products was investigated. Special emphasis was placed on the formation process of Li-Al-CO LDHs. It was found that the R has a significant impact on the types of products. Only at the R being higher than unity, the pure LDHs phase with a chemical formula of LiAl(OH)·2HO can be formed. Low R values (≤0.25) lead to the formation of an ammonium aluminum carbonate hydroxide phase. The formation of the LDHs is essentially via a Li-intercalation mechanism. Amorphous Al(OH) is first formed, and Li ions are then intercalated into the vacancies in the Al(OH)-layers to form crystalline Li-Al-CO LDHs. To the best of our knowledge, this is the first report on the hydrothermal formation process of Li-Al LDHs. This work provides a better understanding for the features of Li-Al LDHs.
在当前工作中，以氯化锂、氯化铝和尿素为原料，采用水热法合成了锂 - 铝 - 碳酸根层状双氢氧化物（LDHs）。研究了氯化锂/氯化铝摩尔比（R）对产物组成的影响。特别关注了锂 - 铝 - 碳酸根LDHs的形成过程。发现R对产物类型有显著影响。仅当R大于1时，才能形成化学式为LiAl(OH)·2HO的纯LDHs相。低R值（≤0.25）会导致形成碳酸氢氧化铝铵相。LDHs的形成本质上是通过锂嵌入机制。首先形成无定形的Al(OH)，然后锂离子嵌入Al(OH)层中的空位形成结晶的锂 - 铝 - 碳酸根LDHs。据我们所知，这是关于锂 - 铝LDHs水热形成过程的首次报道。这项工作有助于更好地理解锂 - 铝LDHs的特性。
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