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石墨烯/二氧化钛降解亚甲基蓝的研究
doi: 10.13205/j.hjgc.201502008
STUDY ON DEGRADATION OF METHYLENE BLUE BY GRAPHENE/TiO2
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摘要: 以钛酸丁酯和氧化石墨烯为前驱物,通过水热法制备石墨烯/二氧化钛(GR/TiO2)复合光催化剂。采用XRD、TEM和FT-IR等技术手段对GR/TiO2粉体的结构和形貌进行了表征。利用对亚甲基蓝光催化降解,考察了GR/TiO2的光催化降解能力,并研究了H2O2用量和p H等因素对光催化降解速率的影响。结果表明:复合催化剂中,TiO2为锐钛型晶体,粒径为25 nm左右,分散在薄纱状的石墨烯上;复合催化剂通过紫外光下光催化性能有所提高,对可见光产生响应,具有良好的稳定性;加入适量H2O2能提高反应速率,碱性条件下,对亚甲基蓝的降解效率更高。Abstract: Graphene /titania ( GR/TiO2 ) multiplex photo-catalyst was prepared through hydrothermal method by using butyl titanate and graphite oxide as precursors． The structure and character of GR/ TiO2 was carefully studied with XRD，TEM，and FT-IR． Photocatalytic activity of GR/TiO2 had been evaluated by degrading methylene blue． The factors that influence the degradation rate were also investigated，such as H2O2 dosage and pH． The results showed that the anatase TiO2 in GR/TiO2 was approximately 25 nm in diameter and scattered on the film-shaped GR． GR/TiO2 had higher photocatalytic performance under UV light and visible light and exhibited excellent stability． The proper H2O2 dosage could accelerate the reaction． In alkaline condition，MB was degraded more easily．
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