Visible light photoelectrocatalysis with salicylic acid-modified TiO2 nanotube array electrode for p-nitrophenol degradation.
This research focused on immersion method synthesis of visible light active salicylic acid (SA)-modified TiO2 nanotube array electrode and its photoelectrocatalytic (PEC) activity. The SA-modified TiO2 nanotube array electrode was synthesized by immersing in SA solution with an anodized TiO2 nanotube array electrode. Scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR), UV-vis diffuse reflectance spectrum (DRS), and Surface photovoltage (SPV) were used to characterize this electrode. It was found that SA-modified TiO2 nanotube array electrode absorbed well into visible region and exhibited enhanced visible light PEC activity on the degradation of p-nitrophenol (PNP). The degradation efficiencies increased from 63 to 100% under UV light, and 79-100% under visible light (lambda>400 nm), compared with TiO2 nanotube array electrode. The enhanced PEC activity of SA-modified TiO2 nanotube array electrode was attributed to the amount of surface hydroxyl groups introduced by SA-modification and the extension of absorption wavelength range.
Wang
Xin
X
School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
Zhao
Huimin
H
Quan
Xie
X
Zhao
Yazhi
Y
Chen
Shuo
S
D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D008027:Light; D043942:Nanotubes / Q000737:chemistry; D009596:Nitrophenols / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis; D020156:Salicylic Acid / Q000737:chemistry; D014025:Titanium
D009596:Nitrophenols; C009495:titanium dioxide; D014025:Titanium; D020156:Salicylic Acid; C024836:4-nitrophenol