摘要
制备了一系列CdS纳米晶/石墨烯(CdS/GR)复合物,并在可见光照条件下评价了其光催化降解亚甲基蓝的光催化效率和抗光腐蚀行为.研究表明,石墨烯的引入加速了CdS纳米晶(NCs)光生电子的迁移速率,抑制了其光生电子-空穴的复合,有效改善了其光催化降解有机污染物的性能.CdS/GR复合物中的石墨烯含量显著影响其光催化效率,其中石墨烯含量为4.6%的光催化剂效率最高,其光电流是CdS NCs的2.3倍.利用光电化学和X射线衍射技术进一步证实,石墨烯的引入抑制了CdS NCs光腐蚀的发生,提高了CdS/GR复合物的光催化稳定性.
A series of CdS nanocrystals/graphene(CdS/GR) nanocomposites with various graphene contents were prepared.Their photocatalytic efficiencies and anti-photocorrosion behavior were studied using methylene blue degradation under visible-light irradiation.The results showed that the introduction of graphene improved the migration efficiency of photogenerated carriers and inhibited charge carrier recombination.The photocatalytic efficiencies of the as-prepared CdS/GR nanocomposites were influenced by the graphene content,achieving a maximum at a graphene content of 4.6 wt%(denoted by CdS/GR-4.6%).The anti-photocorrosion behavior of the CdS/GR-4.6% nanocomposite was further investigated using a photoelectrochemical method and X-ray diffraction analysis. The photocorrosion of CdS nanocrystals was effectively suppressed after the introduction of graphene sheets.Compared with bare CdS nanocrystals,the photocurrent of the CdS/GR-4.6% nanocomposites increased 2.3-fold.
出处
《催化学报》
CSCD
北大核心
2013年第10期1876-1882,共7页
基金
supported by the National Natural Science Foundation of China(21175061,21007021)
the Key Laboratory of Modern Agriculture Equipment and Technology(NZ201109)
the China Postdoctoral Science Foundation(2012M520998)~~
关键词
硫化镉纳米晶
石墨烯纳米复合物
抗光腐蚀
光催化
亚甲基蓝降解
CdS nanocrystal
Graphene nanocomposite
Anti-photocorrosion
Photocatalysis
Methylene blue degradation
