Ren Zhixin, Ma Huachao, Geng Jianxin, Liu Cuijuan, Song Chaoyu, Lv Yuguang
College of Pharmacy, Jiamusi University, Jiamusi 154000, China.
School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Micromachines (Basel). 2023 Jul 26;14(8):1501. doi: 10.3390/mi14081501.
Using an ultrasound-assisted chemical technique, ZnO quantum dot and ZnO composites were created. The optical characteristics and structural details of these composites were examined using TEM, XRD, XPS, FT-IR, UV-vis, and BET. The results revealed that both the ZnO quantum dot composite and ZnO composite exhibited outstanding optical properties, making them suitable for photocatalytic reactions. In order to analyze the photocatalytic performance, a degradation experiment was conducted using Rhodamine B solution as the simulation dye wastewater. The experiment demonstrated that the degradation of Rhodamine B followed the first-order reaction kinetics equation when combined with the photocatalytic reaction kinetics. Moreover, through cyclic stability testing, it was determined that the ZnO QDs-GO-g-CN composite sample showed good stability and could be reused. The degradation rates of Rhodamine B solution using ZnO-GO-g-CN and ZnO QDs-GO-g-CN reached 95.25% and 97.16%, respectively. Furthermore, free-radical-trapping experiments confirmed that ·O was the main active species in the catalytic system and its photocatalytic mechanism was elucidated. The photocatalytic oxidation of ZnO quantum dots in this study has important reference value and provides a new idea for the subsequent research.
采用超声辅助化学技术制备了ZnO量子点和ZnO复合材料。利用透射电子显微镜（TEM）、X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）、傅里叶变换红外光谱仪（FT-IR）、紫外可见分光光度计（UV-vis）和比表面积分析仪（BET）对这些复合材料的光学特性和结构细节进行了研究。结果表明，ZnO量子点复合材料和ZnO复合材料均表现出优异的光学性能，使其适用于光催化反应。为了分析光催化性能，以罗丹明B溶液作为模拟染料废水进行了降解实验。实验表明，结合光催化反应动力学，罗丹明B的降解符合一级反应动力学方程。此外，通过循环稳定性测试，确定ZnO QDs-GO-g-CN复合样品具有良好的稳定性且可重复使用。使用ZnO-GO-g-CN和ZnO QDs-GO-g-CN对罗丹明B溶液的降解率分别达到95.25%和97.16%。此外，自由基捕获实验证实·O是催化体系中的主要活性物种，并阐明了其光催化机理。本研究中ZnO量子点的光催化氧化具有重要的参考价值，为后续研究提供了新思路。
