Zhang Duoying, Lv Shan, Luo Zhi
Department of Electronic Engineering, Jinan University Guangzhou 510632 Guangdong Province China
RSC Adv. 2020 Jan 8;10(3):1275-1280. doi: 10.1039/c9ra07310h. eCollection 2020 Jan 7.
In this study, [KNbO]-[BaNiNbO ] (KBNNO) perovskite powder was synthesized a conventional solid-phase reaction method. The crystal structure of the KBNNO powder was characterized on an X-ray diffractometer. The size and surface morphology of the particles were investigated field emission electron scanning microscopy (FE-SEM). The KBNNO powder particles were stacked from a smooth flat layer. The photocatalytic activity of KBNNO was investigated using a methylene blue (MB) aqueous solution as a model organic substrate. The results showed that the KBNNO powder has excellent photocatalytic degradation performance. The effects of catalyst loading and the initial concentration of the MB solution on the photocatalytic activity were also investigated in this study. The experimental results proved that both catalyst loading and the initial dye concentration are important factors affecting photocatalytic degradation. As the catalyst loading increases, the photocatalytic activity increases. However, the growth rate of the degradation efficiency gradually decreases. Also, the degradation efficiency gradually decreased with the initial concentration of MB.
在本研究中，采用传统固相反应法合成了[KNbO]-[BaNiNbO ]（KBNNO）钙钛矿粉末。在X射线衍射仪上对KBNNO粉末的晶体结构进行了表征。用场发射电子扫描显微镜（FE-SEM）研究了颗粒的尺寸和表面形貌。KBNNO粉末颗粒由光滑的平坦层堆叠而成。以亚甲基蓝（MB）水溶液作为模型有机底物研究了KBNNO的光催化活性。结果表明，KBNNO粉末具有优异的光催化降解性能。本研究还考察了催化剂负载量和MB溶液初始浓度对光催化活性的影响。实验结果证明，催化剂负载量和初始染料浓度都是影响光催化降解的重要因素。随着催化剂负载量的增加，光催化活性增加。然而，降解效率的增长率逐渐降低。而且，降解效率随着MB的初始浓度而逐渐降低。
