氧化石墨烯复合二氧化钛光催化剂的制备及模拟染料废水处理  

Preparation of GO/TiO2 composite photocatalyst and treatment of synthetic dye wastewater

作　　者：李丹丹 姚广铮 梁桂琰 荣旭发 薛若雨 付忠田[1] LI Dan-dan;YAO Guang-zheng;LIANG Gui-yan;RONG Xu-fa;XUE Ruo-yu;FU Zhong-tian(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院

出　　处：《材料工程》2019年第12期104-110,共7页Journal of Materials Engineering

基　　金：东北大学大学生创新大赛重点项目(ZD1706)

摘　　要：用氧化石墨烯(GO)和TiO 2水凝胶制备一系列GO/TiO 2复合光催化剂。通过SEM,XRD和Raman光谱等对复合光催化剂进行表征,研究不同实验条件下纯TiO 2和复合光催化剂对亚甲基蓝(MB)染料废水的脱色效果。结果表明:复合光催化剂中的TiO 2主要为锐钛矿相,其光催化活性优于纯TiO 2。当GO的复合量达到15%(质量分数)时,光催化活性最高。在浓度为10mg/L、初始pH值约为8的30mL合成废水中加入250mg复合光催化剂,2.5h后脱色率可达93.1%。通过复合氧化石墨烯,以TiO 2为主要成分的复合光催化剂具有一定的可见光光催化活性。根据处理前后模拟废水的紫外-可见光光谱全波扫描结果推测,GO/TiO 2复合光催化剂的光生电荷会直接破坏MB分子中的发光基团,在处理过程中没有新的发光基团产生。A series of composite photocatalysts were prepared by using graphene oxide(GO)and TiO 2 hydrogel.The composite photocatalyst was characterized through SEM,XRD and Raman spectroscopy,the decolorization effect of pure TiO 2 and composite photocatalyst on methylene blue(MB)dye wastewater under different experimental conditions was studied.The results show that TiO 2 in composite photocatalyst is mainly anatase phase and its photocatalytic activity is better than pure TiO 2.When the addition of GO reaches 15%(mass fraction),the photocatalytic activity is the highest.When 250mg composite photocatalyst is added to 30mL synthetic wastewater with a concentration of 10mg/L and an initial pH value of about 8,the decolorization rate can reach 93.1%after 2.5 hours,and the composite photocatalyst has visible photocatalytic activity.It is presumed that the photogenerated charges of GO/TiO 2 composite photocatalyst may directly destroy the luminescent groups in the MB molecule,and no other new luminescent groups are generated during the treatment.

关 键 词：GO-TiO 2 光催化活性 亚甲基蓝 紫外光 

分 类 号：X522[环境科学与工程—环境工程]