Photocatalytic decomposition of 4-t-octylphenol over NaBiO3 driven by visible light: catalytic kinetics and corrosion products characterization.
The photocatalytic decomposition of 4-t-octylphenol (4-t-OP) by NaBiO(3) photocatalyst and the catalyst stability in aqueous solution were investigated systematically for the first time. The results showed that some parameters such as catalyst dosage, initial 4-t-OP concentration and pH value of the solution had great effects on the photocatalytic activity. The NaBiO(3) photocatalyst maintained considerable catalytic performance under visible light (lambda>400 nm) irradiation and exhibited a higher photocatalytic activity compared to the commercialized photocatalyst P25. In addition, the corrosion products of NaBiO(3) catalyst under acid condition (HCl aqueous solution contained) were characterized by X-ray diffraction (XRD), transmittance electronic microscopy (TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS) and UV-vis transmittance spectrum analysis. The results showed that NaBiO(3) was unstable under the acidic condition and the catalyst could convert into Bi(3+)-containing compounds such as Bi(2)O(3), etc. The experiment demonstrates that NaBiO(3) can be corroded to nano-sized BiOCl crystal in the presence of hydrogen chloride, the band gap of which was estimated to be 3.28 eV by Tauc's approach.
POPs Research Center, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, PR China.
Xiaofeng
X
Chang
Jun
J
Huang
Cheng
C
Cheng
Wei
W
Sha
Xue
X
Li
Guangbin
G
Ji
Shubo
S
Deng
Gang
G
Yu
D001729:Bismuth / Q000737:chemistry*; D002384:Catalysis; D003343:Corrosion; D006851:Hydrochloric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008027:Light; D046529:Microscopy, Electron, Transmission; D010636:Phenols / Q000737:chemistry*; D010777:Photochemistry; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis; D014961:X-Ray Diffraction
D010636:Phenols; D014874:Water Pollutants, Chemical; C474055:octylphenol; C033301:bismuth oxide; D006851:Hydrochloric Acid; D001729:Bismuth