Organic functionalization of Silicalite-1 nanocrystals by ultrasonic treatment in methanol
Organic functionalization of Silicalite-1 nanocrystals by ultrasonic treatment in methanol
复制标题
DOI：
10.1016/j.micromeso.2008.03.013
复制
发表时间：
2008-12
影响因子：
5.2
通讯作者：
Lik H. Wee;Z. Wang;B. Mihailova;A. Doyle
中科院分区：
文献类型：
--
作者：
Lik H. Wee;Z. Wang;B. Mihailova;A. Doyle
以甲醇为溶剂，采用超声处理法制备了具有有机官能团的Silicalite-1纳米晶。采用衰减全反射红外光谱（ATR-IR）、漫反射傅立叶变换红外光谱（DRIFTS）、热重分析（TGA）和氮气吸附等方法研究了甲醇在Silicalite-1纳米晶上的吸附行为。结果表明，甲氧基（-OCH 3）基团通过末端硅烷醇基团化学吸附到Silicalite-1纳米晶体的外表面上，其在高达420°C下是热稳定的。有机功能化增强了Silicalite-1纳米晶体的疏水性，这已被证明是非常有用的，用于制备单层沸石膜。
Silicalite-1 nanocrystals with organic functional groups were prepared by a simple ultrasonic treatment in methanol. The adsorption of methanol on Silicalite-1 nanocrystals was studied in detail by attenuated total reflection infrared (ATR-IR) spectroscopy, diffuse reflectance fourier transform infrared spectroscopy (DRIFTS), thermogravimetric (TGA) analysis and nitrogen adsorption. The results indicate that methoxy (–OCH3) groups were chemically adsorbed onto the external surface of Silicalite-1 nanocrystals, via terminal silanol groups, which were thermally stable up to 420°C. The organic functionalization enhanced the hydrophobicity of Silicalite-1 nanocrystals, which has proven to be very useful for fabricating monolayer zeolite films.