Graphene Transforms Wide Band Gap ZnS to a Visible Light Photocatalyst. The New Role of Graphene as a Macromolecular Photosensitizer

被引:645
作者
Zhang, Yanhui [1 ,2 ]
Zhang, Nan [1 ,2 ]
Tang, Zi-Rong [2 ]
Xu, Yi-Jun [1 ,2 ]
机构
[1] Fuzhou Univ, State Key Lab Breeding Base Photocatalysis, Coll Chem & Chem Engn, Fuzhou 350002, Peoples R China
[2] Fuzhou Univ, Coll Chem & Chem Engn, Fuzhou 350108, Peoples R China
基金
中国国家自然科学基金;
关键词
graphene; ZnS nanocomposite; photosensitizer; selective oxidation; CHARGE-TRANSFER; TIO2-GRAPHENE NANOCOMPOSITES; HYDROGEN-PRODUCTION; OXIDE; COMPOSITES; TIO2; NANOPARTICLES; DEGRADATION; PERFORMANCE; REDUCTION;
D O I
10.1021/nn304154s
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report the assembly of nanosized ZnS particles on the 2D platform of a graphene oxide (GO) sheet by a facile two-step wet chemistry process, during which the reduced graphene oxide (RGO, also called GR) and the intimate interfacial contact between ZnS nanoparticles and the GR sheet are achieved simultaneously. The ZnS-GR nanocomposites exhibit visible light photoactivity toward aerobic selective oxidation of alcohols and epoxidation of alkenes under ambient conditions. In terms of structure-photoactivity correlation analysis, we for the first time propose a duos new photocatalytic mechanism, where the role of GR in the ZnS-GR nanocomposites acts as an organic dye-like macromolecular "photosensitizer" for ZnS instead of an electron reservoir. This navel photocatalytic mechanism is distinctly different from all previous research on GR-semiconductor photocatalysts, for which GR is claimed to behave as an electron reservoir to capture/shuttle the electrons photogenerated from the semiconductor. This new concept of the reaction mechanism in graphene-semiconductor photocatalysts could provide a new train of thought on designing GR-based composite photocatalysts for targeting applications in solar energy conversion, promoting our in-depth thinking on the microscopic charge carrier transfer pathway connected to the interface between the GR and the semiconductor.
引用
收藏
页码:9777 / 9789
页数:13
相关论文
共 51 条
[1]   Efficient Visible Light Photocatalytic Removal of NO with BiOBr-Graphene Nanocomposites [J].
Ai, Zhihui ;
Ho, Wingkei ;
Lee, Shuncheng .
JOURNAL OF PHYSICAL CHEMISTRY C, 2011, 115 (51) :25330-25337
[2]   Protein Degradation and RNA Efflux of Viruses Photocatalyzed by Graphene-Tungsten Oxide Composite Under Visible Light Irradiation [J].
Akhavan, O. ;
Choobtashani, M. ;
Ghaderi, E. .
JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (17) :9653-9659
[3]   Photocatalytic Reduction of Graphene Oxide Nanosheets on TiO2 Thin Film for Photoinactivation of Bacteria in Solar Light Irradiation [J].
Akhavan, O. ;
Ghaderi, E. .
JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (47) :20214-20220
[4]   Graphene Nanomesh by ZnO Nanorod Photocatalysts [J].
Akhavan, Omid .
ACS NANO, 2010, 4 (07) :4174-4180
[5]   Graphene-based photocatalytic composites [J].
An, Xiaoqiang ;
Yu, Jimmy C. .
RSC ADVANCES, 2011, 1 (08) :1426-1434
[6]   Photoinduced reactivity of titanium dioxide [J].
Carp, O ;
Huisman, CL ;
Reller, A .
PROGRESS IN SOLID STATE CHEMISTRY, 2004, 32 (1-2) :33-177
[7]   Synthesis of Visible-Light Responsive Graphene Oxide/TiO2 Composites with p/n Heterojunction [J].
Chen, Chao ;
Cai, Weimin ;
Long, Mingce ;
Zhou, Baoxue ;
Wu, Yahui ;
Wu, Deyong ;
Feng, Yujie .
ACS NANO, 2010, 4 (11) :6425-6432
[8]   Semiconductor-mediated photodegradation of pollutants under visible-light irradiation [J].
Chen, Chuncheng ;
Ma, Wanhong ;
Zhao, Jincai .
CHEMICAL SOCIETY REVIEWS, 2010, 39 (11) :4206-4219
[9]   Nitrogen-Doped Graphene/ZnSe Nanocomposites: Hydrothermal Synthesis and Their Enhanced Electrochemical and Photocatalytic Activities [J].
Chen, Ping ;
Xiao, Tian-Yuan ;
Li, Hui-Hui ;
Yang, Jing-Jing ;
Wang, Zheng ;
Yao, Hong-Bin ;
Yu, Shu-Hong .
ACS NANO, 2012, 6 (01) :712-719
[10]   Hybrid Graphene/Titania Nanocomposite: Interface Charge Transfer, Hole Doping, and Sensitization for Visible Light Response [J].
Du, Aijun ;
Ng, Yun Hau ;
Bell, Nicholas J. ;
Zhu, Zhonghua ;
Amal, Rose ;
Smith, Sean C. .
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2011, 2 (08) :894-899