Degradation of 4-nitrophenol (4-NP) using Fe-TiO2 as a heterogeneous photo-Fenton catalyst.
Photocatalytic degradation of 4-nitrophenol was investigated using Fe-doped (1, 3, 5 and 8 wt.% Fe) TiO(2) catalysts under UV light irradiation in aqueous dispersions in the presence of H(2)O(2). Photocatalysts with the lowest Fe content (1%) showed a considerably better behavior with respect to the unloaded TiO(2) and the catalysts with higher Fe contents. Photocatalytic degradation was studied under different conditions such as amounts of 1% Fe-TiO(2) catalyst, H(2)O(2) dose and initial pH of 4-NP solution. The results indicated that about 67.53% total organic carbon of a solution containing 20 mg L(-1) 4-NP was removed at pH 6.17 by using 4.9 mM of H(2)O(2) and 0.4 g L(-1) of the catalyst in a 2-L batch photo-reactor, the complete degradation of 4-NP occurring after 60 min. It was also observed that catalytic behavior could be reproduced in consecutive experiments without a considerable decrease of the UV/Fe-TiO(2)/H(2)O(2) process efficiency.
Zhao
Binxia
B
College of Chemical Engineering, Northwest University, 229 Taibai North Road, Xi'an, Shaanxi 710069, China. zxlbx@china.com
Mele
Giuseppe
G
Pio
Iolanda
I
Li
Jun
J
Palmisano
Leonardo
L
Vasapollo
Giuseppe
G
D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009596:Nitrophenols / Q000737:chemistry*; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
C045076:Fenton's reagent; D009596:Nitrophenols; C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; D007501:Iron; C024836:4-nitrophenol