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A series of erbium ion-doped TiO_2(Er~(3+)-TiO_2) films were prepared by a sol-gel dip/spin coating method, and the effect of the dosage of erbium ion(0–2.0 mol%), the films coating layers(1–5 layers), and calcination temperature(400–700 °C) on the film structure and photocatalytic activity were investigated in detail. The films were characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), thermal analysis(TG-DTG) and UV–Vis diffusive reflectance spectra(DRS). The results showed that the films were composed of anatase, and no other TiO_2 phases(rutile and brookite). With the increase of the erbium ion dosage, the crystal size decreased. Erbium ion doping could enhance the thermal stability of TiO_2 and inhibit the increase of the crystallite size. Meanwhile doping of erbium ions gave rise to three typical absorption peaks within the range of visible light(400–700 nm), locating at 490, 523, and 654 nm, attributed to the transition of 4 f electrons. The higher calcination temperature led to higher crystallinity and bigger crystal grains. The photocatalytic performance of the films was evaluated by degradation of methyl orange solution under simulated solar light. The highest quality film we prepared was with 4 layers, 1.0 mol% dosage of erbium ion, and the calcination temperature of 500 °C. With this film,the degradation percentage of 7.8 mg/L methyl orange solution was up to 53.3% under simulated solar light after 6 h photoreaction.
A series of erbium ion-doped TiO 2 (Er 3+ -TiO 2) films were prepared by a sol-gel dip / spin coating method, and the effect of the dosage of erbium ion (0-2.0 mol%), the (1-5 layers), and calcination temperature (400-700 ° C) on the film structure and photocatalytic activity were investigated in detail. The films were characterized by means of X-ray diffraction (XRD) (SEM), thermal analysis (TG-DTG) and UV-Vis diffusive reflectance spectra (DRS). The results showed the the films were composed of anatase, and no other TiO 2 phases (rutile and brookite). With the increase of the erbium ion doping could increase the thermal stability of TiO_2 and inhibit the increase of the crystallite size. Erodium ion doping could enhance the thermal stability of TiO_2 and inhibit the increase of the crystallite size. ), locating at 490, 523, and 654 nm, attributed to the transition of 4 f electrons. The photocatalytic performance of the films was evaluated by degradation of methyl orange solution under simulated solar light. The highest quality film we prepared was with 4 layers, 1.0 mol% dosage of erbium ion , and the calcination temperature of 500 ° C. With this film, the degradation percentage of 7.8 mg / L methyl orange solution was up to 53.3% under simulated solar light after 6 h photoreaction.