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Title: Enhanced photocatalytic Fe3+ reduction with H2O2 generation by TiO2 anatase/rutile blend
Authors: Karunakaran, C
Vasumathi, D
Vinayagamoorthy, P
Keywords: Photooxidation;Photoreduction;Photocatalysis;Interparticle charge transfer;Iron;Titania
Issue Date: 8-Sep-2015
Publisher: NISCAIR-CSIR, India
Abstract: TiO2 P25 Degussa, TiO2 Hombikat, anatase TiO2 and WO3 nanocrystals photocatalyze the reduction of iron(III) ion in aqueous acidic solution with generation of hydrogen peroxide. The photocatalytic activities of TiO2 P25 and TiO2 Hombikat are much higher than those of anatase TiO2 and WO3. The nanomaterials have been characterized by powder X-ray diffraction and solid state impedance, UV-visible diffuse reflectance and photoluminescence spectroscopies. The photoreduction decreases with increase of iron(III) ion concentration because of inner filter effect. While the photoreaction is slow at high acidity the reaction rate increases with increase in photon flux. Molecular oxygen does not play any role in the photoreduction. The Fe(III)-reduction is more effective with UV-C light than with UV-A light. The nanooxides show sustainable photocatalytic activity. Charge separation between anatase and rutile phases is the likely reason for the observed large photocatalytic activities of TiO2 P25 and TiO2 Hombikat.
Page(s): 1076-1084
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.54A(09) [September 2015]

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