Blažeka Damjan, Car Julio, Klobučar Nikola, Jurov Andrea, Zavašnik Janez, Jagodar Andrea, Kovačević Eva, Krstulović Nikša
Institute of Physics, Bijenička cesta 46, 10000 Zagreb, Croatia.
Department of Gaseous Electronics, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.
Materials (Basel). 2020 Sep 30;13(19):4357. doi: 10.3390/ma13194357.
In this paper we examined the photocatalytic efficiency of a laser-synthesized colloidal solution of ZnO nanoparticles synthesized by laser ablation in water. The average size of the obtained colloidal ZnO nanoparticles is about 47 nm. As revealed by electron microscopy, other nanostructures were also present in the colloidal solution, especially nanosheets. A photocatalytic degradation of UV-irradiated Methylene Blue and Rhodamine B solutions of different concentration in the presence of different ZnO catalyst mass concentrations was studied in order to examine their influence on photodegradation rates. ZnO nanoparticles have shown high photocatalytic efficiency, which is limited due to different effects related to UV light transmittivity through the colloidal solution. Therefore, increasing catalyst concentration is effective way to increase photocatalytic efficiency up to some value where photodegradation rate saturation occurs. The photodegradation rate increases as the dye concentration decreases. These findings are important for water purification applications of laser-synthesized ZnO nanoparticles.
在本文中，我们研究了通过激光烧蚀在水中合成的ZnO纳米颗粒的激光合成胶体溶液的光催化效率。所获得的胶体ZnO纳米颗粒的平均尺寸约为47nm。如电子显微镜所揭示的，胶体溶液中还存在其他纳米结构，尤其是纳米片。为了研究它们对光降解速率的影响，研究了在不同ZnO催化剂质量浓度下，不同浓度的紫外线照射亚甲基蓝和罗丹明B溶液的光催化降解。ZnO纳米颗粒显示出高光催化效率，但由于与通过胶体溶液的紫外线透射率相关的不同效应，其受到限制。因此，增加催化剂浓度是提高光催化效率的有效方法，直到光降解速率达到饱和值。光降解速率随着染料浓度的降低而增加。这些发现对于激光合成ZnO纳米颗粒的水净化应用很重要。
