Rapid photocatalytic degradation of PCP-Na over NaBiO3 driven by visible light irradiation.
The photocatalytic performance of sodium pentachlorophenate (PCP-Na) over NaBiO(3) under visible light irradiation was first investigated systematically. After 1h of photocatalytic reaction, the degradation rate of PCP-Na could reach to 90.5% in appropriate conditions. OH is the dominant photooxidant rather than O(2)(-) based on the experiment results and density of states (DOS) analysis. The PCP-Na solution became basic (pH value increased to approximately 9) with the progress of photocatalytic reaction which may be attributed to the PCP(-) oxidized to the pentachlorophenoxy radical by an attack on PCP(-) by OH. The photocatalytic reaction over NaBiO(3) follows the rule of first-order reaction according to the Langmuir-Hinshelwood model. The initial concentration of the PCP-Na, the initial pH value of PCP-Na aqueous solution and the amount of NaBiO(3) used have great influences on the photocatalytic performance. Three kinds of photocatalytic systems (P25, Bi(2)O(3) and P25-Bi(2)O(3) heterojunction) exhibited relative lower photocatalytic activity compared to NaBiO(3) powder.
Chang
Xiaofeng
X
Nanomaterials Research Institute, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.
Ji
Guangbin
G
Sui
Qian
Q
Huang
Jun
J
Yu
Gang
G
D001729:Bismuth / Q000528:radiation effects*; D002384:Catalysis; D006863:Hydrogen-Ion Concentration; D008027:Light; D010416:Pentachlorophenol / Q000528:radiation effects*; D055668:Photochemical Processes; D012996:Solutions; D014867:Water
D012996:Solutions; D014867:Water; C033301:bismuth oxide; D010416:Pentachlorophenol; D001729:Bismuth