Peng Fuchang, Gao Honglin, Zhang Genlin, Zhu Zhongqi, Zhang Jin, Liu Qingju
School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/Nano Materials & Technology, Yunnan University, Kunming 650091, China.
College of Material Engineering, Panzhihua University, Panzhihua 617000, China.
Materials (Basel). 2017 Feb 21;10(2):209. doi: 10.3390/ma10020209.
Mixed phase TiO₂ nanoparticles with element doping by Sm and C were prepared via a facile sol-gel procedure. The UV-Vis light-diffuse reflectance spectroscopy analysis showed that the absorption region of co-doped TiO₂ was shifted to the visible-light region, which was attributed to incorporation of samarium and carbon into the TiO₂ lattice during high-temperature reaction. Samarium effectively decreased the anatase-rutile phase transformation. The grain size can be controlled by Sm doping to achieve a large specific surface area useful for the enhancement of photocatalytic activity. The photocatalytic activities under visible light irradiation were evaluated by photocatalytic degradation of methylene blue (MB). The degradation rate of MB over the Sm-C co-doped TiO₂ sample was the best. Additionally, first-order apparent rate constants increased by about 4.3 times compared to that of commercial Degusssa P25 under the same experimental conditions. Using different types of scavengers, the results indicated that the electrons, holes, and •OH radicals are the main active species for the MB degradation. The high visible-light photocatalytic activity was attributed to low recombination of the photo-generated electrons and holes which originated from the synergistic effect of the co-doped ions and the heterostructure.
通过简便的溶胶 - 凝胶法制备了Sm和C元素掺杂的混合相TiO₂纳米颗粒。紫外 - 可见漫反射光谱分析表明，共掺杂TiO₂的吸收区域向可见光区域移动，这归因于高温反应过程中钐和碳掺入TiO₂晶格。钐有效地降低了锐钛矿 - 金红石相转变。通过Sm掺杂可以控制晶粒尺寸，以获得有利于提高光催化活性的大比表面积。通过亚甲基蓝（MB）的光催化降解评估可见光照射下的光催化活性。Sm - C共掺杂TiO₂样品上MB的降解率最佳。此外，在相同实验条件下，一级表观速率常数相比于商用Degusssa P25提高了约4.3倍。使用不同类型的清除剂，结果表明电子、空穴和•OH自由基是MB降解的主要活性物种。高可见光光催化活性归因于光生电子和空穴的低复合率，这源于共掺杂离子的协同效应和异质结构。
