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Publication Detail
Coupling Oxygen Ion Conduction to Photocatalysis in Mesoporous Nanorod-like Ceria Significantly Improves Photocatalytic Efficiency
  • Publication Type:
    Journal article
  • Publication Sub Type:
    JOUR
  • Authors:
    Li YZ, Sun Q, Kong M, Shi WQ, Huang JC, Tang JW, Zhao XJ
  • Publication date:
    28/07/2011
  • Pagination:
    14050, 14057
  • Journal:
    Journal of Physical Chemistry C
  • Volume:
    115
  • Issue:
    29
  • Print ISSN:
    1932-7447
  • Keywords:
    TITANIUM-DIOXIDE, TIO2, CEO2, IRRADIATION, OXIDATION, BENZENE, CELL, DEGRADATION, RADICALS, TOLUENE
  • Author URL:
  • Notes:
    Times Cited: 0 AMER CHEMICAL SOC 1155 16TH ST, NW, WASHINGTON, DC 20036 USA WASHINGTON Article 794JP English Cited References Count: 32 Li, Y. Z Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, 122 Luoshi Rd, Wuhan 430070, Peoples R China
Abstract
The mesoporous nanorod-like ceria with high BET surface area of 121 m(2)/g is prepared by a facile method, microwave-assisted hydrolysis of Ce(NO(3))(3)center dot 6H(2)O in presence of urea. As compared to bulk ceria, its absorption edge significantly shifts to the visible region with a band gap of as low as 2.75 eV due to the presence of Ce(3+). A novel strategy of significantly improving its photocatalytic efficiency is developed by coupling oxygen ion conduction to photocatalysis in the mesoporous nanorod-like ceria, in which UV-visible photons and thermal energy from a Hg lamp were integrated. Under such photothermocatalytic oxidation conditions, the mesoporous nanorod-like ceria exhibits much higher photothermocatalytic activity for the gas-phase minerlization of organic contaminants than corresponding alone thermocatalytic and photocatalytic activity and good photothermocatalytic stability. The significantly enhanced mobility of oxygen ions with increasing temperature raised by thermal energy from the Hg lamp greatly improves the separation efficiency of photogenerated electrons and holes by UV-vis photons in the mesoporous nanorod-like ceria. Moreover, the hole-trapped lattice oxygen ion generated by UV-vis irradiation is more active than the lattice oxygen ion for benzene oxidation. These beneficial effects promote catalytic efficiency for gas-phase purification of organic contaminants such as benzene, hexane, and actone
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