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Pure TiO 2 and erbium ion-doped TiO 2 (Er 3+ -TiO 2 ) catalysts prepared by the sol–gel method were characterized by means of XRD and diffusive reflectance spectra (DRS). The XRD results showed that erbium ion doping could enhance the thermal stability of TiO 2 and inhibit the increase of the crystallite size, and the DRS results showed that the optical absorption...
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