Silica nanoparticles were synthesized from rice husk ash at room temperature by sonochemical method. The
feeding rate of percipiteting agent and time of sonication were investigated. The nanostructure of the synthesized powder
was realized by the FE-SEM photomicrograph, FT-IR spectroscopy, XRD and XRF analyses. These analytical
observations have revealed that the nano-sized amorphous silica particles are formed and they are spheroidal in shape. The
average particle size of the silica powders is found to be around 50 nm. The as-synthesized silica nanoparticles were
subsequently modified with chlorosulfonic acid and prepared silica sulfuric acid nanoparticles, which were employed as
an efficient catalyst for the acylation of alcohols and phenols with acetic anhydride in excellent yields under solvent-free
conditions at room temperature. This reported method is simple, mild, and environmentally viable and catalyst can be
simply recovered and reused over 9 times without any significant loss of its catalytic activity.
通过声
化学方法,在室温下利用稻壳灰合成了
硅纳米颗粒,并研究了沉淀剂的投料速率和超声处理时间。通过FE-
SEM显微照片、FT-IR光谱、XRD和XRF分析,实现了合成粉末的纳米结构。这些分析观察揭示了形成了纳米尺寸的非晶
硅颗粒,且它们呈球形。
硅粉的平均粒径约为50纳米。随后,合成的
硅纳米颗粒被
氯磺酸修饰,制备了
硅硫酸纳米颗粒,这些纳米颗粒被用作在室温下无溶剂条件下,以
醋酐为酰化剂对醇和
酚进行酰化反应的高效催化剂,产率优异。该报告的方法简单、温和且环境友好,催化剂可以简单地回收并重复使用超过9次,而不会显著损失其催化活性。