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Photocatalytic reduction of Cr(VI) in aqueous solution using TiO₂ nanoparticles prepared with various alcohols as
Young Ku1, Chia-Nan Lin, Wei-Ming Hou
1Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei 106, Taiwan. ku508@mail.ntust.edu.tw
Abstract:
TiO₂ nanoparticles were prepared with various linear alkyl chains of alcohols under a sol-gel process. The structure characterization and the photocatalytic reduction of hexavalent chromium of the TiO₂ nanoparticles were investigated. The phase transformation temperature, crystal aggregation and surface area of prepared TiO₂ samples were found to be strongly influenced by alcohol used. The phase transformation from anatase to rutile was retarded and the surface area was reduced for TiO₂ prepared with alcohols of longer alkyl chain. TiO₂ nanoparticles prepared with methanol or ethanol exhibited higher photocatalytic reduction activity of hexavalent chromium possibly due to greater and more positively charged surface area.
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