还原石墨烯氧化物/磷酸铋纳米复合物的合成及增强的光催化活性

Facile Solvothermal Synthesis of Reduced Graphene Oxide-BiPO_4 Nanocomposite with Enhanced Photocatalytic Activity

以石墨烯氧化物和硝酸铋为前驱物、甘油为溶剂,200℃下反应1 h,采用溶剂热方法"一锅煮"合成还原石墨烯氧化物/磷酸铋复合纳米材料。利用扫描电镜、透射电镜、X射线衍射、X射线光电子能谱、表面增强拉曼光谱和紫外-可见光谱对所合成样品的形貌和结构进行表征。以罗丹明B作为降解模型分子,考察了复合纳米材料在紫外光照射下的光催化活性。实验结果表明,复合纳米材料的光催化活性优于磷酸铋。在2 h内,还原石墨烯氧化物/磷酸铋对罗丹明B降解率为87.5%;而同样条件下,磷酸铋对罗丹明B的降解率仅为45.7%。复合材料光催化活性的提高主要归因于石墨烯纳米片高效的电子受体和传输特性能有效促进电子-空穴对的分离,进而提高了复合材料的降解效率。

Reduced graphene oxide-BiPO4 （RGO-BiPO4 ） nanocomposite was synthesized successfully via a one-pot solvothermal method using graphene oxide and bismuth nitrate as precursors and glycerin as solvent at 200℃ for 1 h. The morphology and structure of as-prepared nanocomposite were characterized by SEM, TEM, XRD, XPS, SERS and UV-Visible spectrum. The photocatalytic activity of the nanocomposite was evaluated by the photodegradation of Rhodamine B （RhB） dye under UV irradiation and it was found that RGO-BiPO4 nanocomposite possessed higher photocatalytic activity than that of pure BiPO4. RhB could be decomposed 87.5 % within 2 h. Under the same conditions, only 45.7 % of the RhB dye could be decomposed by BiPO4. The enhancement of photocatalytic activity could be attributed to the effective charge separation due to the electron-accepting and transporting properties of graphene.