Jaihindh Dhayanantha Prabu, Chen Ching-Cheng, Fu Yen-Pei
Department of Materials Science and Engineering, National Dong Hwa University Shou-Feng Hualien 97401 Taiwan
RSC Adv. 2018 Feb 9;8(12):6488-6501. doi: 10.1039/c7ra13418e. eCollection 2018 Feb 6.
Graphene oxide-based composites have been developed as cheap and effective photocatalysts for dye degradation and water splitting applications. Herein, we report reduced graphene oxide (rGO)/Ag/Fe-doped TiO that has been successfully prepared using a simple process. The resulting composites were characterized by a wide range of physicochemical techniques. The photocatalytic activities of the composite materials were studied under visible light supplied by a 35 W Xe arc lamp. The rGO/Ag/Fe-doped TiO composite demonstrated excellent degradation of methylene blue (MB) in 150 min and 4-nitrophenol (4-NP) in 210 min under visible light irradiation, and trapping experiments were carried out to explain the mechanism of photocatalytic activity. Moreover, electrochemical studies were carried out to demonstrate the oxygen evolution reaction (OER) activity on rGO/Ag/Fe-doped TiO in 1 M of HSO electrolyte, with a scan rate of 50 mV s. The reductions in overpotential are due to the d-orbital splitting in Fe-doped TiO and rGO as an electron collector and transporter.
氧化石墨烯基复合材料已被开发为用于染料降解和水分解应用的廉价且有效的光催化剂。在此，我们报道了通过简单工艺成功制备的还原氧化石墨烯（rGO）/Ag/Fe掺杂TiO。所得复合材料通过多种物理化学技术进行了表征。在35 W氙弧灯提供的可见光下研究了复合材料的光催化活性。rGO/Ag/Fe掺杂TiO复合材料在可见光照射下150分钟内对亚甲基蓝（MB）和210分钟内对4-硝基苯酚（4-NP）表现出优异的降解效果，并进行了捕获实验以解释光催化活性的机制。此外，进行了电化学研究以证明rGO/Ag/Fe掺杂TiO在1 M HSO电解质中、扫描速率为50 mV s时的析氧反应（OER）活性。过电位的降低归因于Fe掺杂TiO中的d轨道分裂以及rGO作为电子收集器和传输器的作用。
