Photocatalytic decomposition of 4-t-octylphenol over NaBiO3 driven by visible light: Catalytic kinetics and corrosion products characterization

Abstract

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.

Efficient application of nano-TiO2 thin films in the photocatalytic removal of Alizarin Yellow from aqueous solutions

“…Similar to nitrate, the nitrite ions also inhibit the degradation of AY. Previously, it was reported that EDTA was a good scavenger for h + from the VB and caused a significant decrease the degradation of pollutants from aqueous solutions [41]. However, in this study EDTA is not suppressed Fig.…”

Photocatalytic properties of KBiO3 and LiBiO3 with tunnel structures

“…Apart from Bi (III) containing compounds, Bi (V) containing compounds have also been reported as active photocatalysts. [22][23][24][25][26] NaBiO 3 exhibits much higher activity compared to BiVO 4 and n-doped TiO 2 for the decomposition of methylene blue (MB) under visible light. The attractive performance of NaBiO 3 is ascribed to its band structure where the CB consists of hybridized Na (3s) and O (2p) orbitals that exhibit large dispersion with high mobility for photo-excited electrons.…”

Photocatalytic Degradation of Acridine Orange over NaBiO3 Driven by Visible Light Irradiation

“…Compared to TiO 2 photocatalyst, NaBiO 3 exhibited an extremely efficient photocatalytic performance (degradation rate is over 99%) towards AO under visible light irradiation. The excellent performance could be attributed to the hybridized sp orbital in the conduction band of NaBiO 3 (Na 3s and O 2p hybridized orbits), supporting a high mobility on the sp bands for the photo-excited electrons, which may lead to suppression of the recombination of electron-hole pair and a relatively higher photocatalytic activity of the material than that of other photocatalysts [14]. …”

“…Their results show that NaBiO 3 presented an efficient degradation towards the organic compounds. The photocatalytic degradation of sodium pentachlorophenate (PCP-Na) and 4-t-octylphenol (4-t-OP) over NaBiO 3 under visible light irradiation was reported by Chang et al [13,14]. Their results show that PCP-Na and 4-t-OP in aqueous solutions can be efficiently decomposed in the NaBiO 3 /visible light process.…”