School of Biological and Chemical Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, PR China.
School of Biological and Chemical Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, PR China; Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
J Colloid Interface Sci. 2019 Nov 15;556:726-733. doi: 10.1016/j.jcis.2019.08.111. Epub 2019 Aug 30.
A 3D flower-like mesoporous Ce doped ZnO composite composed of nanosheets was prepared by a facile, one-step wet chemical method at room temperature. It was found that the moderate Ce doping can improve the light absorption of ZnO. The photocatalytic activities of the samples were studied by the degradation of Rhodamine B (RhB) and phenol under stimulated sunlight. The 1% mole ratio of Ce doped ZnO composites (denoted as CZ1) showed higher photocatalytic performance than other samples, where 85.1% of RhB and 69.6% of phenol can be removed within 125 min and 120 min, respectively. The Ce doped in the lattice of ZnO can act as the electron trapping sites, which effectively improve the electron-hole separation. In addition, it was also found the annealing temperature had effect on the morphology and structure of Ce doped ZnO. The photocatalytic performance can be further enhanced at proper annealing temperature (500 °C) due to the increase of ZnO crystallinity with maintained flower-like structure and the formation of CeO-ZnO heterojunction at their tight interface promoting the separation of photogenerated electron-hole pairs.
采用简便的室温一步湿法化学法制备了由纳米片组成的 3D 花状介孔 Ce 掺杂 ZnO 复合材料。研究发现，适度的 Ce 掺杂可以提高 ZnO 的光吸收。通过模拟太阳光下罗丹明 B（RhB）和苯酚的降解研究了样品的光催化活性。1%摩尔比的 Ce 掺杂 ZnO 复合材料（记为 CZ1）表现出比其他样品更高的光催化性能，其中 RhB 和苯酚分别在 125 分钟和 120 分钟内可去除 85.1%和 69.6%。Ce 掺杂到 ZnO 的晶格中可以作为电子捕获位点，有效提高了电子-空穴分离。此外，还发现退火温度对 Ce 掺杂 ZnO 的形貌和结构有影响。在适当的退火温度（500°C）下，光催化性能可以进一步提高，这是由于 ZnO 结晶度的增加保持了花状结构，并且在紧密界面处形成了 CeO-ZnO 异质结，促进了光生电子-空穴对的分离。
