摘要
采用改进Hummers法制备氧化石墨,将氧化石墨烯与硝酸银溶液搅拌处理一段时间后,滴加适量磷酸氢二钠溶液,制备得到石墨烯/磷酸银(GO/Ag3PO4)复合材料.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)等手段对制备的复合材料进行了表征,并以有机染料罗丹明B的降解反应为模型评价催化剂在可见光下的光催化活性.测试结果表明,该方法不仅合成过程简单,而且石墨烯表面所负载的Ag3PO4纳米颗粒尺寸小、分散性好,与石墨烯的结合牢固.由于氧化石墨烯优异的吸附性能和对载流子的高迁移率,GO/Ag3PO4复合光催化剂显示出较高的可见光光催化活性和光稳定性.在可见光下对10mg/L的罗丹明B作用20min,降解率可达98%,降解效率较Ag3PO4颗粒提高近一倍.
The graphite oxide （GO）was prepared by an improved Hummers method.For the synthesis of the GO/Ag3 PO 4 composite,AgNO 3 solution was added to the GO solution whilst magnetically stirring. Subsequently,Na2 HPO 4 aqueous solution was added drop by drop to the solution.The prepared GO/Ag3 PO 4 composites were characterized by Scanning electron microscope （SEM）,transmission elec-tron microscopy （TEM）,X-ray diffraction （XRD）and X-ray photoelectron spectroscopy （XPS）analysis. The photocatalytic activity of the composite was evaluated by the degradation of Rhodamine B organic dye （RhB）solution （100 mL,10 mg/L）under visible-light irradiation.The results indicate that small Ag3 PO 4 nanoparticles are well dispersed and anchored onto the exfoliated GO sheets.Compared with bare Ag3 PO 4 ,this GO/Ag3 PO 4 composite exhibits significantly higher photocatalytic activities and im-proves stability under visible-light irradiation,which is attributed to high-surface-area GO sheets,en-hances absorption of organic dyes and efficient separation of photogenerated electron-hole pairs.The deg-radation rate of RhB solution was approximately 98% under visible light irradiation in just 20 minutes, nearly twice that of bare Ag3 PO 4 photocatalyst.
出处
《安徽工程大学学报》
CAS
2015年第5期25-31,共7页
Journal of Anhui Polytechnic University
基金
国家青年基金资助项目(51302001)
安徽省优秀人才基金资助项目(2013SQRL036ZD)
关键词
氧化石墨烯
磷酸银
复合材料
光催化
graphene oxide
silver phosphate
composite material
phtocatalysis
