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在溶胶-凝胶合成过程中,分别利用超声波处理ZnO溶胶、加水至溶胶中煮沸、加庚烷至溶胶中、蒸发除去部分溶剂等简单的沉淀方法制备了10 nm以下不同尺寸的ZnO颗粒.在60℃下通过超声波处理ZnO溶胶可得到高质量的ZnO纳米颗粒,颗粒粒径为6.2±1.5 nm,标准偏差为8%.同时,基于作者以前的发现,提出了在该溶胶凝胶法中新的ZnO形成机理.在光催化降解甲基橙过程中,纳米ZnO不同的颗粒尺寸及团聚情况导致其光催化活性有所差异,具有较小粒径和团聚较轻的ZnO纳米颗粒显示出较高的光催化活性.
In the process of sol-gel synthesis, ZnO particles with different sizes of 10 nm and below were prepared by ultrasonic treatment of ZnO sol, adding water to boil in sol, adding heptane into sol, and evaporating some solvents, respectively. High-quality ZnO nanoparticles were obtained by ultrasonic treatment of ZnO sol at 60 ℃ with a particle size of 6.2 ± 1.5 nm and a standard deviation of 8% .At the same time, based on the author’s previous findings, a new sol-gel method was proposed Of the formation mechanism of ZnO in the photocatalytic degradation of methyl orange, nano-ZnO different particle size and agglomeration led to differences in their photocatalytic activity, with smaller particle size and agglomeration of ZnO nanoparticles showed higher light Photocatalytic activity.