浸渍提拉法制备改性氧化石墨烯光催化薄膜及其性能表征

摘要

采用浸渍提拉法在玻璃基底上制备改性氧化石墨烯(GO)薄膜,研究了工艺条件对改性GO薄膜附着力的影响,通过扫描电镜和拉曼光谱对改性GO薄膜的微观形貌和结构进行表征,测试了可见光下改性GO薄膜对COD(化学需氧量)为54.35 mg/L的城市污水的降解性能.结果发现,在GO质量浓度为1.0 mg/mL,提拉(浸渍)速率为120 mm/min,镀膜间隔为12 s,镀膜次数为5次的条件下制得的改性GO薄膜具有最佳的附着力.改性GO薄膜具有良好的稳定性和可见光催化性能,24 h的COD去除率可以达到70.6%,经15次重复使用后的COD去除率依然达到63.4%.%A modified graphene oxide (GO) thin film was formed on the glass substrate by dip coating method. The effects of process conditions on the adhesion strength of the thin film were studied. The microscopic morphology and structure of the modified GO film were characterized by scanning electron microscopy and Raman spectroscopy. The performance of the modified GO film on the photodegradation of a sewage containing 54.35 mg/L COD (chemical oxygen demand) under visible light was tested. The results showed that the modified GO film prepared by repeatedly dipping into a solution containing 1 mg/mL GO at a constant rate of 120 mm/min and pulling up at the same rate after an interval of 12 s for 5 times has the optimal adhesion strength. The modified GO film has good stability and photocatalytic property in that the COD removal rate reached 70.6% within 24 h and still maintained as high as 63.4% after 15 times of repeated use.