Preparations of TiO2 film coated on foam nickel substrate by sol-gel processes and its photocatalytic activity for degradation of acetaldehyde.
Anatase TiO2 films were successfully prepared on foam nickel substrates by sol-gel technique using tetrabutyl titanate as precursor. The characteristics of the TiO2 films were investigated by XPS, XRD, FE-SEM, TEM and UV-Vis absorption spectra. The photocatalytic activities of TiO2 films were investigated by photocatalytic degradation reactions of gaseous acetaldehyde, an indoor pollutant, under ultraviolet light irradiation. It was found that Ni2+ doping into Ti02 films due to the foam nickel substrates resulted in the extension of absorption edges of TiO2 films from UV region to visible light region. The pre-heating for foam nickel substrates resulted in the formation of NiO layer, which prevented effectively the injection of photogenerated electrons from TiO2 films to metal nickel. The TiO2 films displayed high photocatalytic activity for the degradation of acetaldehyde, and were enhanced by calcining the substrates and coating TiO2 films repeatedly. The high activity was mainly attributed to the improvement of the characteristics of substrate surface and the increase of active sites on photocatalyst.
Hu
Hai
H
Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, Shanghai 200030, China.
Xiao
Wen-jun
WJ
Yuan
Jian
J
Shi
Jian-wei
JW
Chen
Ming-xia
MX
Shang Guan
Wen-feng
WF
D000079:Acetaldehyde / Q000737:chemistry*; D002384:Catalysis; D005782:Gels; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D005782:Gels; C009495:titanium dioxide; D009532:Nickel; D014025:Titanium; D000079:Acetaldehyde