Visible light induced photodegradation of organic pollutants on nitrogen and fluorine co-doped TiO2 photocatalyst.
The nitrogen and fluorine co-doped TiO2 polycrystalline powder was synthesized by calcinations of the hydrolysis product of tetrabutyl titanate with ammonium fluoride. Nitrogen and fluorine co-doping causes the absorption edge of TiO2 to shift to a lower energy region. The photocatalytic activity of co-doped TiO2 with anatase phases was found to be 2.4 times higher than that of the commercial TiO2 photocatalyst Degussa P25 for phenol decomposition under visible light irradiation. The co-doped TiO2 powders only contain anatase phases even at 1000 degrees C. Apparently, ammonium fluoride added retarded phase transformation of the TiO2 powders from anatase to rutile. The substitutional fluorine and interstitial nitrogen atoms in co-doped TiO2 polycrystalline powder were responsible for the vis light response and caused the absorption edge of TiO2 to shift to a lower energy region.
Wang
Zheng-peng
ZP
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China.
Xu
Jun
J
Cai
Wei-min
WM
Zhou
Bao-xue
BX
He
Zheng-guang
ZG
Cai
Chun-guang
CG
Hong
Xiao-ting
XT
D000042:Absorption; D064751:Ammonium Compounds; D002384:Catalysis; D004785:Environmental Pollutants; D005459:Fluorides / Q000737:chemistry; D005461:Fluorine / Q000737:chemistry; D008027:Light; D009584:Nitrogen / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods*; D000644:Quaternary Ammonium Compounds; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D064751:Ammonium Compounds; D004785:Environmental Pollutants; D009930:Organic Chemicals; D000644:Quaternary Ammonium Compounds; C009495:titanium dioxide; D005461:Fluorine; C024822:ammonium fluoride; D014025:Titanium; D009584:Nitrogen; D005459:Fluorides