Carbon dots-TiO2 nanosheets composites for photoreduction of Cr(VI) under sunlight illumination: Favorable role of carbon dots
Carbon dots-TiO2 nanosheets composites for photoreduction of Cr(VI) under sunlight illumination: Favorable role of carbon dots
复制标题
碳点-TiO2纳米片复合材料在阳光照射下光还原Cr(VI)：碳点的有利作用
DOI：
10.1016/j.apcatb.2017.10.023
复制
发表时间：
2018-05-01
影响因子：
22.1
通讯作者：
Na, Ping
中科院分区：
文献类型：
--
作者：
Li, Yaru;Liu, Zhongmin;Na, Ping
采用水热法制备了碳点-TiO2纳米片（CDs-TNs）复合材料，并首次将其应用于太阳光照射下Cr（VI）的光还原。采用透射电镜、X射线衍射、热重分析、傅里叶变换红外光谱仪、X射线光电子能谱等对材料进行了表征。结果证实，CD通过Ti-O-C键成功地与TN结合。随着CD的引入，CDs-TNs复合材料表现出优异的Cr（VI）光还原性能，其高于TNs、P25和CDs-P25。CD独特的上转换性质和电子转移性质在光还原过程中对光捕获和载流子转移起着至关重要的作用。最重要的是，CD可以促进H2O2的形成，导致空穴的消耗。结果，光诱导的电子-空穴对的复合被阻碍，并且CDs-TN的光还原活性被促进。
Carbon dots-TiO2 nanosheets (CDs-TNs) composites were synthesized by hydrothermal method and applied for the first time in photoreduction of Cr(VI) under sunlight illumination. The materials were characterized by transmission electron microscope, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectrometer, and X-ray photoelectron spectroscopy analysis. The results confirmed that CDs are successfully incorporated with TNs through Ti-O-C bonds. With the introduction of CDs, CDs-TNs composites exhibit excellent photoreduction performance of Cr(VI), which is higher than that of TNs, P25 and CDs-P25. The unique upconversion property and electron transfer property of CDs play essential roles on light harvesting and charge carriers transferring in the photoreduction process. Most importantly, CDs could facilitate the formation of H2O2, leading to the consumption of holes. As a result, the recombination of photoinduced electron-hole pairs is hindered and photoreduction activity of CDs-TNs is promoted.