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.
Chang
Xiaofeng
X
POPs Research Center, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, PR China.
Huang
Jun
J
Cheng
Cheng
C
Sha
Wei
W
Li
Xue
X
Ji
Guangbin
G
Deng
Shubo
S
Yu
Gang
G
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