PMID- 27748477
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180130
LR  - 20180130
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 18
IP  - 46
DP  - 2016 Nov 23
TI  - A highly efficient g-C(3)N(4)/SiO(2) heterojunction: the role of SiO(2) in the 
      enhancement of visible light photocatalytic activity.
PG  - 31410-31418
AB  - SiO(2), an insulator, hardly has any photocatalytic acitivity due to its 
      intrinsic property, and it is generally used as a hard template to increase the 
      surface area of catalysts. However, in this work, we found that the surface state 
      of the insulator SiO(2) can promote the migration of photogenerated charge 
      carriers, leading to the enhancement of the photooxidation ability of graphitic 
      carbon nitride (g-C(3)N(4)). A one-pot calcination method was employed to prepare 
      g-C(3)N(4)/SiO(2) composites using melamine and SiO(2) as precursors. The 
      composites present considerably high photocatalytic degradation activities for 
      2,4-dichlorophenol (2,4-DCP) and rhodamine B (RhB) under visible light (lambda > 420 
      nm) irradiation, which are about 1.53 and 4.18 times as high as those of bulk 
      g-C(3)N(4), respectively. The enhancement of the photocatalytic activity is due 
      to the fact that the introduction of the insulator SiO(2) in g-C(3)N(4)/SiO(2) 
      composites can greatly improve the specific surface area of the composites; more 
      importantly, the impurity energy level of SiO(2) can help accelerate the 
      separation and transfer of electron-hole pairs of g-C(3)N(4). Electron 
      paramagnetic resonance (EPR) spectroscopy and trapping experiments with different 
      radical scavengers show that the main active species of g-C(3)N(4) are superoxide 
      radicals, while holes also play a role in photodegradation. For 
      g-C(3)N(4)/SiO(2)-5, besides superoxide radicals and holes, the effect of 
      hydroxyl radicals was greatly improved. Finally, a possible mechanism for the 
      photogenerated charge carrier migration of the g-C(3)N(4)/SiO(2) photocatalyst 
      was proposed.
FAU - Hao, Qiang
AU  - Hao Q
AD  - National Laboratory of Mineral Materials, School of Materials Science and 
      Technology, China University of Geosciences, Beijing 100083, China. 
      chendaimei@cugb.edu.cn.
FAU - Niu, Xiuxiu
AU  - Niu X
AD  - National Laboratory of Mineral Materials, School of Materials Science and 
      Technology, China University of Geosciences, Beijing 100083, China. 
      chendaimei@cugb.edu.cn.
FAU - Nie, Changshun
AU  - Nie C
AD  - National Laboratory of Mineral Materials, School of Materials Science and 
      Technology, China University of Geosciences, Beijing 100083, China. 
      chendaimei@cugb.edu.cn.
FAU - Hao, Simeng
AU  - Hao S
AD  - National Laboratory of Mineral Materials, School of Materials Science and 
      Technology, China University of Geosciences, Beijing 100083, China. 
      chendaimei@cugb.edu.cn.
FAU - Zou, Wei
AU  - Zou W
AD  - National Laboratory of Mineral Materials, School of Materials Science and 
      Technology, China University of Geosciences, Beijing 100083, China. 
      chendaimei@cugb.edu.cn.
FAU - Ge, Jiangman
AU  - Ge J
AD  - National Laboratory of Mineral Materials, School of Materials Science and 
      Technology, China University of Geosciences, Beijing 100083, China. 
      chendaimei@cugb.edu.cn.
FAU - Chen, Daimei
AU  - Chen D
AD  - National Laboratory of Mineral Materials, School of Materials Science and 
      Technology, China University of Geosciences, Beijing 100083, China. 
      chendaimei@cugb.edu.cn.
FAU - Yao, Wenqing
AU  - Yao W
AD  - Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China. 
      yaowq@tsinghua.edu.cn.
LA  - eng
PT  - Journal Article
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
EDAT- 2016/10/18 06:00
MHDA- 2016/10/18 06:01
CRDT- 2016/10/18 06:00
PHST- 2016/10/18 06:00 [pubmed]
PHST- 2016/10/18 06:01 [medline]
PHST- 2016/10/18 06:00 [entrez]
AID - 10.1039/c6cp06122b [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2016 Nov 23;18(46):31410-31418. doi: 10.1039/c6cp06122b.