温和条件下混合碱辅助水热合成硅酸镁纳米管(英文)

Composite-Hydroxide-Assisted Hydrothermal Synthesis of Magnesium Silicate Nanotube

在混和碱的辅助下,以普通氢氧化镁和二氧化硅粉末为原料在温和条件下高效合成硅酸镁纳米管。采用XRD,TEM,FTIR,氮气吸附等多种手段对产物进行了表征,并对其合成过程进行了研究。结果表明氢氧化钠和氢氧化钾的共融液能提高反应物间的溶解性,促进反应可以在温和条件下加快进行。250℃下合成硅酸镁纳米管,传统水热法至少需要7 d,混合辅助水热合成只需36 h。与传统的水热法相比,混和碱辅助的水热法是一种温和且高效的过程。

A mild and highly efficient hydrothermal synthesis method for uniform magnesium silicate nanotubes was developed from normal Mg（OH）2 and SiO2 powders with the assistance of potassium hydroxide and sodium hydroxide. The samples were characterized by XRD, TEM, IR, and nitrogen adsorption-desorption. The synthetic process was studied by XRD, TEM, etc. The results indicate that the eutectic solution of potassium hydroxide and sodium hydroxide offers higher dissolvability for the reactants and benefits the reaction between the reactants. This composite-hydroxide-assisted approach is a mild and highly efficient procedure for the synthesis of high quality magnesium silicate nanotubes at 250 ℃ in a short duration of 36 hours, while it needs over 7 days at 250 ℃ for traditional hydrothermal method.