Mesoporous zinc ferrite: synthesis, characterization, and photocatalytic activity with H2O2/visible light.
Mesoporous ZnFe(2)O(4) (meso-ZnFe(2)O(4)) was synthesized by a hydrothermal process in which cetyltrimethylammonium bromide (CTAB) participates in the reaction to produce nanocrystals. Synthesized ZnFe(2)O(4) was characterized by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, scanning electronic microscopy (SEM), transmission electron microscopy (TEM), and diffuse reflectance spectra (DRS). The meso-ZnFe(2)O(4) was resulted from the agglomeration of nanoparticles with size of 5-10nm. The photocatalytic activity of ZnFe(2)O(4) under visible light (λ>400 nm) was evaluated by the degradation of Acid Orange II (AOII) at different sintering temperatures, the amount of ZnFe(2)O(4), and the concentration of H(2)O(2). The photocatalytic degradation of AOII was almost complete within 2h in H(2)O(2)/visible light system. The high efficiency for AOII degradation was attributed to the strong absorption of ZnFe(2)O(4) in visible-light region and the generation of reactive OH by H(2)O(2) in the system. The involvement of OH in oxidizing AOII was examined by determining the photocurrent of ZnFe(2)O(4), [OH], and degradation rates using different scavengers. Organic compounds as intermediates of the degradation process were identified by LC/MS. Moreover, ZnFe(2)O(4) retained their degradation efficiencies for a series of repetitive batch runs, indicating the true photocatalytic process.
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Minhua
M
Su
Chun
C
He
Virender K
VK
Sharma
Mudar
M
Abou Asi
Dehua
D
Xia
Xiang-zhong
XZ
Li
Huiqi
H
Deng
Ya
Y
Xiong
D001391:Azo Compounds / Q000737:chemistry* / Q000528:radiation effects; D002384:Catalysis; D002853:Chromatography, Liquid; D005290:Ferric Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D008027:Light; D013058:Mass Spectrometry; D008855:Microscopy, Electron, Scanning; D009281:Naphthalenes / Q000737:chemistry* / Q000528:radiation effects; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D013056:Spectrophotometry, Ultraviolet; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000138:chemical synthesis / Q000737:chemistry*
C456587:Acid Orange II; D001391:Azo Compounds; D005290:Ferric Compounds; D009281:Naphthalenes; D016877:Oxidants; D014874:Water Pollutants, Chemical; D017967:Zinc Compounds; D006861:Hydrogen Peroxide