热处理工艺对改性石墨烯薄膜光催化性能的影响

Influence of Different Heat Treatment on Photocatalytic Performance of Modified Graphene Film

根据改进的Hummers法制备了5mg/mL的改性石墨烯分散液,并且采用匀胶法在玻璃基底上制备了改性石墨烯薄膜。采用包括Raman光谱在内的多种手段对热处理还原前后薄膜的微观形貌、成分及结构进行了表征。以亚甲基蓝作为目标降解物,在可见光照射下研究了不同温度下,真空还原和空气还原两种热处理还原方式对该薄膜光催化性能的影响。结果表明:随着热处理温度的升高,薄膜表面含氧官能团逐渐去除,EDS能谱中C/O原子比逐渐增大,拉曼光谱中ID/IG逐渐增强,反应速率常数逐渐降低,改性石墨烯薄膜光催化降解亚甲基蓝能力逐渐下降,相同温度下,真空热处理薄膜比空气热处理薄膜光催化降解能力高。

According to the modified Hummers method,5 mg/mL modified graphene dispersion was prepared and the modified graphene film was formed on the glass substrate by spin coating method.The microstructures,compositions and structures of the modified graphene film before and after the heat treatment reduction were characterized by some techniques including Raman spectroscopy.Methylene blue as a target,the effects of vacuum reduction and air reduction at different temperatures on the photocatalytic performance of the modified graphene film were studied under visible light irradiation.The results show that with the increase of the heat treatment temperature,the oxygen functional groups on the surface of the film have been increasingly removed.The atomic ratio of C/O in the EDS spectrum increases gradually,and the ID/IGin the Raman spectrum shows the same trend.Meanwhile the reaction rate constant of the modified graphene film slowly decreases,and the photocatalytic degradation ability of the methylene blue also decreases accordingly.However,the photocatalytic degradation capacity of the vacuum heat treatment film is higher than that of the air heat treatment film at the same temperature.