摘要
以鳞片石墨为原料,用改进的Hummers法制备氧化石墨烯(GO),以异丙醇钛为钛源经一步水热法制备得到金红石相TiO_2-石墨烯复合材料(rGO-TiO_2),考察了氧化石墨烯用量对复合材料光催化性能的影响.采用X射线衍射(XRD),比表面积(BET),透射电镜(TEM),扫描电镜(SEM),拉曼光谱,紫外-可见(UV-Vis)吸收光谱和荧光光谱(PL)等测试手段对复合材料进行表征.结果表明:复合材料中TiO_2为针簇状结构的金红石相,与石墨烯能够均匀复合;与纯金红石相TiO_2相比,复合材料具有较大的比表面积.研究了该复合材料在紫外光F对罗丹明B以及可见光下对甲基橙光降解效果.当氧化石墨烯浓度为0.5 mg·mL^(-1)时,制备得到的复合材料rGO-TiO_2具有较好的光催化效果.
In this work, graphene oxide （GO） was prepared from natural flake graphite by the modified Hummers method. A series of composites consisting of rutile TiO2 and graphene （rGO-TiO2） were synthesized via a one-step hydrothermal reaction of graphene oxide and titanium isopropylate. The influence of the amount of graphene oxide on the photocatalytic activity of the rGO-TiO2 composites was studied. The photocatalysts were characterized by Brunauer-Emmett-Teller sorption （BET）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, Raman spectroscopy, UV-Vis absorbance spectroscopy, and photoluminescence （PL） spectroscopy. The as-formed TiO2 was formed in the futile phase with a needle-cluster structure, and dispersed uniformly on the surface of graphene sheets. The composites possess higher specific areas than pure rutile TiO2. The photo-degradation performance of Rhodamine B and methyl orange by the rGO-TiO2 composites under ultraviolet and visible light was studied. The results indicated that rGO-TiO2 composites prepared with 0.5 mg·mL-1 of graphene oxide had the greatest photocatalytic activity.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第2期403-410,共8页
Acta Physico-Chimica Sinica
基金
浙江省自然科学基金(Y4110523
LY12E01003)资助项目~~
