Song Fengyan, Sun Hao, Ma Hailong, Gao Hui
Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Biology, School of Life Science and Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.
Ningbo Institute of Technology, Beihang University, Ningbo 315100, China.
Nanomaterials (Basel). 2022 Jul 23;12(15):2536. doi: 10.3390/nano12152536.
Electron-hole recombination and the narrow-range utilization of sunlight limit the photocatalytic efficiency of titanium oxide (TiO). We synthesized carbon dots (CDs) and modified TiO nanoparticles (NPs) with a flower-like mesoporous structure, i.e., porous TiO/CDs nanoflowers. Among such hybrid particles, the CDs worked as photosensitizers for the mesoporous TiO and enabled the resultant TiO/CDs nanoflowers with a wide-range light absorption. Rhodamine B (Rh-B) was employed as a model organic pollutant to investigate the photocatalytic activity of the TiO/CDs nanoflowers. The results demonstrated that the decoration of the CDs on both the TiO nanoflowers and the (commercially available AEROXIDE TiO) P25 NPs enabled a significant improvement in the photocatalytic degradation efficiency compared with the pristine TiO. The TiO/CDs nanoflowers, with their porous structure and larger surface areas compared to P25, showed a higher efficiency to prevent local aggregation of carbon materials. All of the results revealed that the introduced CDs, with the unique mesoporous structure, large surface areas and loads of pore channels of the prepared TiO NPs, played important roles in the enhancement of the photocatalytic efficiency of the TiO/CDs hybrid nanoflowers.
电子 - 空穴复合以及太阳光的窄范围利用限制了二氧化钛（TiO₂）的光催化效率。我们合成了碳点（CDs）并对具有花状介孔结构的TiO₂纳米颗粒（NPs）进行了改性，即多孔TiO₂/CDs纳米花。在这类杂化颗粒中，CDs作为介孔TiO₂的光敏剂，使所得的TiO₂/CDs纳米花具有宽范围的光吸收。罗丹明B（Rh - B）用作模型有机污染物，以研究TiO₂/CDs纳米花的光催化活性。结果表明，与原始TiO₂相比，在TiO₂纳米花和（市售的AEROXIDE TiO₂）P25 NPs上修饰CDs均能显著提高光催化降解效率。与P25相比，具有多孔结构和更大表面积的TiO₂/CDs纳米花在防止碳材料局部聚集方面表现出更高的效率。所有结果表明，所引入的CDs具有独特的介孔结构、大表面积以及所制备的TiO₂ NPs的大量孔道，在提高TiO₂/CDs杂化纳米花的光催化效率方面发挥了重要作用。
