Structure and photocatalytic activity studies of TiO{sub 2}-supported over Ce-modified Al-MCM-41

Journal Article · Wed Jul 01 04:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2009.02.005· OSTI ID:22029807

Krishna Reddy, Jakkidi ^[1]; Durgakumari, Valluri ^[1]; Subrahmanyam, Machiraju; Sreedhar, Bojja ^[1]

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1. Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Habsiguda, Hyderabad 500607, Andhra Pradesh (India)

Ce-Al-MCM-41, TiO{sub 2}/Al-MCM-41 and TiO{sub 2}/Ce-Al-MCM-41 materials with varying contents of Ce (by impregnation) and TiO{sub 2} loaded (by solid-state dispersion) on Al-MCM-41 support are prepared. The Ce modified and TiO{sub 2} loaded composite systems are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra (DRS) and X-ray photoelectron spectroscopy (XPS) techniques. The DRS and XPS of low Ce content (0.2-0.5 wt.%) modified Al-MCM-41 samples are showing more characteristic of Ce{sup 3+} species wherein cerium in interaction with Al-MCM-41 and that of high Ce (0.8, 3.0 wt.%) content modified samples are showing the characteristic of both Ce{sup 4+}and Ce{sup 3+}species. A series of Ce-modified Al-MCM-41 and TiO{sub 2} loaded composite catalysts are evaluated for photocatalytic degradation of phenol under UV irradiation. Low Ce content in Ce{sup 3+} state on Al-MCM-41 is showing good photoactivity in comparison with high Ce content samples and pure ceria. The composite TiO{sub 2}/Ce-Al-MCM-41 is showing enhanced degradation activity due decreased rate of electron-hole recombination on TiO{sub 2} surface by the redox properties of cerium. The photocatalyst TiO{sub 2}/Ce-Al-MCM-41 with an optimum of 10 wt.% TiO{sub 2} and 0.3 wt.% Ce is showing maximum phenol degradation activity. The possible mechanism of phenol degradation on the composite photocatalyst is proposed.

• OSTI ID: 22029807
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BUILDING MATERIALS
CERIUM
CERIUM IONS
CERIUM OXIDES
DISPERSIONS
IRRADIATION
PHENOL
PHOTOCATALYSIS
RECOMBINATION
SEMICONDUCTOR MATERIALS
SOLIDS
SURFACE PROPERTIES
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY