Preparation and activity evaluation of p-n junction photocatalyst NiO/TiO2.
p-n Junction photocatalyst NiO/TiO2 was prepared by sol-gel method using Ni(NO3)2.6H2O and tetrabutyl titanate [Ti(OC4H9)4] as the raw materials. The p-n junction photocatalyst NiO/TiO2 was characterized by UV-vis diffuse reflection spectrum, X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the photocatalyst was evaluated by photocatalytic reduction of Cr2O7(2-) and photocatalytic oxidation of rhodamine B. The results show that, for photocatalytic reduction of Cr2O7(2-), the optimum percentage of doped-NiO is 0.5% (mole ratio of Ni/Ti). The photocatalytic activity of the p-n junction NiO/TiO2 is much higher than that of TiO2 on the photocatalytic reduction of Cr2O7(2-). However, the photocatalytic activity of the p-n junction photocatalyst NiO/TiO2 is much lower than that of TiO2 on the photocatalytic oxidation of rhodamine B. Namely, the p-n junction photocatalyst NiO/TiO2 has higher photocatalytic reduction activity, but lower photocatalytic oxidation activity. Effects of heat treatment on the photocatalytic activity of p-n junction photocatalyst NiO/TiO2 were investigated. The mechanisms of influence on the photocatalytic activity were also discussed by the p-n junction principle.
Shifu
Chen
C
Department of Chemistry, Huaibei Coal Normal College, Anhui, Huaibei 235000, People's Republic of China. chshifu@hbcnc.edu.cn
Sujuan
Zhang
Z
Wei
Liu
L
Wei
Zhao
Z
D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry / Q000528:radiation effects; D006358:Hot Temperature; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D010777:Photochemistry; D011192:Potassium Dichromate / Q000737:chemistry / Q000528:radiation effects; D012235:Rhodamines / Q000737:chemistry / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects
D004396:Coloring Agents; D012235:Rhodamines; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D009532:Nickel; C028007:nickel monoxide; D014025:Titanium; C029773:rhodamine B; D011192:Potassium Dichromate