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Bottom-up synthesis of titanophosphate nanosheets by the aqueous solution process
Nanoscale Advances ( IF 4.7 ) Pub Date : 2020-07-07 , DOI: 10.1039/d0na00376j
Takayuki Ban 1 , Keito Asano 1 , Chika Takai-Yamashita 1 , Yutaka Ohya 1
Affiliation  

The synthesis of titanophosphate nanosheets in aqueous sols was examined by the bottom-up process. The nanosheets were formed by mixing titanium iso-propoxide, phosphoric acid, and tetraalkylammonium hydroxide (NR4OH) aqueous solutions, followed by diluting with water and heating at 80 °C, forming translucent aqueous sols of titanophosphate nanosheets with the same crystal structure as layered titanium phosphate Ti2O3(H2PO4)2·2H2O. Whether the nanosheets were crystallized depended on the reactions during the mixing of reagents before the water dilution. By controlling the acid–base reactions between the Ti species, phosphoric acid, and the hydroxides of bulky cations in the aqueous sols, the one-pot process yielded highly water-dispersible, flake-like titanophosphate nanosheets. Under some synthetic conditions, nanosheets formed even in weakly basic aqueous sols. These nanosheets can be coated on a substrate with low alkali-resistance, or used for the removal of metal ions from neutral aqueous solutions.

中文翻译:

水溶液法自下而上合成磷酸钛纳米片

通过自下而上的方法检查了在水溶胶中合成磷酸钛纳米片。通过混合异丙醇钛、磷酸和四烷基氢氧化铵 (NR 4 OH) 水溶液,然后用水稀释并在 80 °C 下加热,形成具有相同晶体结构的半透明磷酸钛纳米片水溶胶形成纳米片。层状磷酸钛 Ti 2 O 3 (H 2 PO 4 ) 2 ·2H 2O. 纳米片是否结晶取决于水稀释前试剂混合过程中的反应。通过控制水溶胶中钛、磷酸和大块阳离子的氢氧化物之间的酸碱反应,一锅法制备了高度水分散性的片状磷酸钛纳米片。在某些合成条件下,即使在弱碱性水溶胶中也能形成纳米片。这些纳米片可以涂覆在具有低耐碱性的基材上,或用于从中性水溶液中去除金属离子。
更新日期:2020-08-11
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