Mahdavi Reza, Ashraf Talesh S Siamak
Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran.
Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran.
Ultrason Sonochem. 2017 Nov;39:504-510. doi: 10.1016/j.ultsonch.2017.05.012. Epub 2017 May 8.
In this research, the effect of ultrasonic irradiation power (0, 75, 150 and 200W) and time (0, 5, 15 and 20min) on the structure, morphology and photocatalytic activity of zinc oxide nanoparticles synthesized by sol-gel method was investigated. Crystallographic structures and the morphologies of the resultant powders were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The XRD patterns showed that ZnO samples were crystallized in their pure phase. The purity of samples was increased by increasing the ultrasonic irradiation power and time. Not only did ultrasonic irradiation unify both the structure and the morphology, but also it reduced the size and prohibited particles from aggregation. The optical behavior of the samples was studied by UV-vis spectroscopy. Photocatalytic activity of particles was measured by degradation of methyl orange under radiation of ultraviolet light. Ultrasound nanoparticles represented higher degradation compared to non-ultrasound ones.
本研究考察了超声辐照功率（0、75、150和200W）和时间（0、5、15和20分钟）对溶胶-凝胶法合成的氧化锌纳米颗粒的结构、形貌和光催化活性的影响。通过X射线衍射（XRD）和透射电子显微镜（TEM）确定了所得粉末的晶体结构和形貌。XRD图谱表明，ZnO样品以纯相结晶。通过增加超声辐照功率和时间提高了样品的纯度。超声辐照不仅使结构和形貌均匀化，而且减小了尺寸并防止颗粒聚集。通过紫外-可见光谱研究了样品的光学行为。通过在紫外光辐射下甲基橙的降解来测量颗粒的光催化活性。与非超声纳米颗粒相比，超声纳米颗粒表现出更高的降解率。
