Characterization and photocatalytic properties of Ru, C co-modified one-dimensional TiO2-based composites prepared via a single precursor approach

With Ru-3(CO)(12) being used as precursor, Ru and C co-modified one-dimensional nano TiO2 composites (Ru-C/TiO2) were prepared by the single precursor approach. The composites were characterized with TEM, XRD, UV-Vis DRS, XPS, TG-DTA, ICP, and EA. TEM images showed that RuO2 nanoparticles, whose size was in the range of 3-7 nm, were uniformly dispersed on the surface of TiO2. XPS results revealed that the carbon in Ru-C/TiO2 calcinated in N-2 atmosphere existed as active carbon and carbonate, and ruthenium existed as Ru4+ ions. The photocatalytic performances of products were evaluated by monitoring their catalytic activities for degradation of methyl orange solution under both UV and simulated sunlight irradiations. The influences of contents of ruthenium and carbon, calcination temperature and atmosphere on the photocatalytic activities of the composites were investigated. Obtained results showed that the Ru-C/TiO2 calcinated at 500 degrees C in N-2 atmosphere exhibited higher photocatalytic activity than P25 under the same conditions.

以Ru₃(CO)₁₂为前驱体，采用单前驱体法制备了Ru和C共修饰的一维纳米TiO₂复合材料（Ru - C/TiO₂）。利用透射电子显微镜（TEM）、X射线衍射（XRD）、紫外 - 可见漫反射光谱（UV - Vis DRS）、X射线光电子能谱（XPS）、热重 - 差热分析（TG - DTA）、电感耦合等离子体发射光谱（ICP）和元素分析（EA）对复合材料进行了表征。TEM图像显示，尺寸在3 - 7 nm范围内的RuO₂纳米粒子均匀地分散在TiO₂表面。XPS结果表明，在N₂气氛中煅烧的Ru - C/TiO₂中的碳以活性炭和碳酸盐的形式存在，钌以Ru⁴⁺离子的形式存在。通过监测产物在紫外光和模拟太阳光照射下对甲基橙溶液的降解催化活性来评估其光催化性能。研究了钌和碳的含量、煅烧温度和气氛对复合材料光催化活性的影响。结果表明，在相同条件下，在N₂气氛中500℃煅烧的Ru - C/TiO₂比P25表现出更高的光催化活性。