A whole series of titania nanocomposites modified with reduced graphene oxide (rGO) was prepared using solvothermal method followed by calcination. Modification of titania with rGO has been found to lead to better photocatalytic properties. The highest photocatalytic performance was obtained at calcination temperature of 600°C. Electron paramagnetic resonance/ferromagnetic resonance measurements showed oxygen defects and ferromagnetic ordering systems. The linewidth of resonance line of oxygen defects decreased linearly with calcination temperature increasing up to 600°C and an accompanying growth of mean crystallite size of anatase phase. The integrated resonance line intensity of oxygen defects depended on the calcination temperature and caused a very large increase in the intensity of resonance lines originating from oxygen defects, because inert atmosphere of calcination was enhanced by graphene presence. The occurrence of magnetic ordering system significantly influenced the performance of photocatalytic processes by changing the amount of oxygen defects.

中文翻译：

---

负载在还原的氧化石墨烯薄片上的二氧化钛光催化剂中的磁矩中心

使用溶剂热法然后煅烧制备了一系列用还原氧化石墨烯（rGO）改性的二氧化钛纳米复合材料。已经发现用rGO修饰二氧化钛可导致更好的光催化性能。在600℃的煅烧温度下获得最高的光催化性能。电子顺磁共振/铁磁共振测量显示出氧缺陷和铁磁有序系统。氧缺陷共振线的线宽随煅烧温度升高至600°C并随锐钛矿相平均晶粒尺寸的增加而线性降低。氧缺陷的共振线的综合强度取决于煅烧温度，并导致源自氧缺陷的共振线的强度大大增加，因为石墨烯的存在增强了煅烧的惰性气氛。磁性有序系统的出现通过改变氧缺陷的数量极大地影响了光催化过程的性能。