Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species
Publication in refereed journal


Times Cited
Web of Science337WOS source URL (as at 26/10/2020) Click here for the latest count
Altmetrics Information
.

Other information
AbstractAgBr was creatively immobilized on a magnetic substrate (SiO(2)-coated Fe(3)O(4) nanoparticle, SFN) to achieve magnetic separation after visible light-driven photocatalytic oxidation (PCO). The resulted Ag/AgBr/SFN was characterized by TEM, vibrating sample magnetometer and other techniques. It is found that the average diameter of the Ag/AgBr/SFN particle is less than 20 nm. The typical superparamagnetic behavior of Ag/AgBr/SFN implies that the catalyst can be magnetically separated. The physicochemical features of the used Ag/AgBr/SFN after visible light irradiation were not dramatically changed by X-ray diffraction, UV-Vis diffuse reflectance spectra and Fourier transform-infrared analysis. SiO(2) interlayer was proven to slightly increase the degradation efficiency for an azo dye Acid Orange 7. UV-Vis spectra and HPLC analysis indicated that the dye was oxidized and decomposed. The photoactivity of Ag/AgBr/SFN was partly maintained after successive PCO under visible light. In order to evaluate the roles of e(-)-h(+) pairs and reactive oxygen species, the quenching effect was examined by employing Ag/AgBr/SFN and commercial TiO(2) (P-25) under visible light (lambda > 400 nm) and UV-A irradiation, respectively. Active h(+) and the resulting (center dot)OH played the major roles for degradation. The effect of active h(+) and (center dot)OH were proven to be highly dependent on the concentration of photocatalysts. The effect of (center dot)OH was more obvious for P-25, while that of active h(+) was more predominant for Ag/AgBr/SFN. (C) 2009 Elsevier Ltd. All rights reserved.
All Author(s) ListLi GT, Wong KH, Zhang XW, Hu C, Yu JC, Chan RCY, Wong PK
Journal nameChemosphere
Year2009
Month8
Day1
Volume Number76
Issue Number9
PublisherElsevier
Pages1185 - 1191
ISSN0045-6535
eISSN1879-1298
LanguagesEnglish-United Kingdom
KeywordsAcid Orange 7; AgBr; Magnetic photocatalyst; Ross; Visible light
Web of Science Subject CategoriesEnvironmental Sciences; ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology

Last updated on 2020-27-10 at 01:23