Preparation, Characterization and Photocatalytic Property of Eu-doped TiO2 Hollow Microspheres

doi:10.15541/jim20140599

Abstract

Abstract:

Pure TiO₂ and Eu-doped TiO₂ hollow microspheres were prepared by Sol-Gel method and characterized by techniques such as XRD, SEM, TEM, HRTEM, BET and XPS. Photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The experimental results show that the dosage of TBOT has a great effect on the morphology of TiO₂ hollow microspheres. When the dosage of TBOT is 1.5 mL, the obtained hollow microspheres disperse well and show clear structure. XRD pattern indicates that TiO₂ hollow microspheres calcined at 400℃ present anatase structure and Eu-doped ones can restrain the anatase phase from converting to rutile phase. The experimental results suggest that Eu-doped can obviously improve the photocatalytic activity of TiO₂ hollow microsphere and when the doping of Eu is 0.7%, the photocatalytic degradation reaches the best because of its highest surface area and smallest crystallize size and pore diameter.

Key words: titanium dioxide, hollow, Eu-doped, Sol-Gel, calcination temperature, tetra-n-butyl titanate

CLC Number:

TF123

LIU Yang-Long, ZHENG Yu-Ying, SHANG Peng-Bo. Preparation, Characterization and Photocatalytic Property of Eu-doped TiO₂ Hollow Microspheres[J]. Journal of Inorganic Materials, 2015, 30(7): 699-705.

Figures/Tables 8

Fig. 1 Schematic diagram for the preparation of TiO2 hollow microspheres

Fig. 2 SEM images of hollow microspheres prepared from solution with different quantities of TBOT (a-d) and TEM (e) and HRTEM (f) images of hollow microspheres by adding 1.5 mL TBOT (a) TBOT, 0.5 mL; (b) TBOT, 1 mL; (c) TBOT, 1.5 mL; (d) TBOT, 2 mL

Fig. 3 XRD patterns of TiO2 hollow microspheres after being calcined at different temperatures

Fig. 4 XRD patterns of TiO2 hollow microspheres with different Eu doping concentrations

Fig. 5 N2 adsorption-desorption isotherms and corresponding pore size distribution of TiO2 hollow microsphere samples with different Eu doping concentrations

Table 1 Physical parameters of TiO2 hollow microsphere samples with different Eu doping concentrations

Sample	Crystallize size/nm	Surface area/(m²·g^-1)	Pore diameter/nm
TE(0)	12.9	221	5.5
TE(0.1%)	10.7	256	4.9
TE(0.3%)	9.5	275	4.2
TE(0.7%)	8.3	298	3.5
TE(1.2%)	10.0	268	4.5
TE(1.5%)	11.2	250	5.1

Fig. 6 XPS spectra of sample TE (0.7%) after being calcined at 400℃ (a) Full XPS spectra; (b) Ti2p; (c) O1s; (d) Eu4d

Fig. 7 Photocatalytic degradation curve of MB by samples with different Eu doping concentrations

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Preparation, Characterization and Photocatalytic Property of Eu-doped TiO₂ Hollow Microspheres

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