Yang Zhao, Wang Jianlong
Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, P. R. China.
Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, P. R. China.
Langmuir. 2023 Mar 21;39(11):4179-4189. doi: 10.1021/acs.langmuir.3c00223. Epub 2023 Mar 8.
The synthesis of efficient and stable catalysts for photocatalytic reactions is still a challenge. In this study, a new photocatalyst composed of two-dimensional titanium carbide (TiCT) and CdS quantum dots (QDs) was fabricated, in which CdS QDs were intimately anchored on the TiCT sheet surface. Due to the specific interface characteristics of CdS QDs/TiCT, TiCT can considerably facilitate the generation of photogenerated charge carriers, their separation, and their transfer from CdS. As expected, the obtained CdS QDs/TiCT exhibit outstanding photocatalytic performance for carbamazepine (CBZ) degradation. Moreover, the quenching experiments demonstrated that superoxide radicals (O), HO, O, and OH are the reactive species involved in CBZ degradation, while O made a major contribution. In addition, the sunlight-driven CdS QDs/TiCT photocatalytic system is widely suitable for the elimination of different emerging pollutants in various water matrices, suggesting its potential practical environmental applications.
合成用于光催化反应的高效稳定催化剂仍然是一项挑战。在本研究中，制备了一种由二维碳化钛（TiCT）和硫化镉量子点（QDs）组成的新型光催化剂，其中硫化镉量子点紧密锚定在TiCT片材表面。由于CdS QDs/TiCT的特定界面特性，TiCT可以极大地促进光生电荷载流子的产生、分离及其从CdS的转移。正如预期的那样，所制备的CdS QDs/TiCT对卡马西平（CBZ）降解表现出优异的光催化性能。此外，猝灭实验表明，超氧自由基（O）、HO、O和OH是参与CBZ降解的活性物种，而O起主要作用。此外，阳光驱动的CdS QDs/TiCT光催化系统广泛适用于去除各种水基质中的不同新兴污染物，表明其潜在的实际环境应用价值。
