Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

被引：14
作者：
Barrocas, Beatriz [1 ]
Monteiro, Olinda C. [1 ]
Nunes, Manuel R. [1 ]
Silvestre, Antonio J. [2 ,3 ,4 ,5 ]
机构：
[1] Univ Lisbon, Fac Ciencias, CQB CQE, Lisbon, Portugal
[2] Inst Politecn Lisboa, ISEL, Dept Fis, Lisbon, Portugal
[3] Univ Lisbon, LSPL, Dept Fis, Fac Ciencias, Lisbon, Portugal
[4] Univ Lisbon, CeFEMA, Dept Fis, Fac Ciencias, Lisbon, Portugal
[5] Univ Lisbon, Inst Super Tecn, Dept Fis, Lisbon, Portugal
来源：
SN APPLIED SCIENCES | 2019年 / 1卷 / 06期
关键词：
TM-TiO2; nanoparticles; Optical bandgap; Urbach energy; Photocatalysis; Organic pollutants; ADVANCED OXIDATION PROCESSES; DOPED TIO2; WATER-TREATMENT; NANOPARTICLES; CO; DEGRADATION; ANATASE; NANOFIBERS; MECHANISMS; SELECTIVITY;
D O I：
10.1007/s42452-019-0567-4
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
TiO2 and TM-doped TiO2 (TM = Re, Ru) anatase crystalline nanopowders were synthesized by a simple hydrothermal method. Samples with nominal TM/Ti ratio of 0.01 were prepared for this study. Their structural, microstructural and optical properties were studied. The lattice parameters of the different prepared samples were calculated and their mean crystallite sizes determined to be in the range 15-7 nm, the lower values being obtained for the doped crystallites. The samples' specific surface areas were determined and correlated with their mean crystallite sizes. The incorporation of the dopant elements results in an increase of the optical absorption in the visible range. The samples' optical bandgap and Urbach energies were calculated from UV-Vis diffuse reflectance spectra. The photocatalytic behavior of the synthesized samples was investigated for the rhodamine B and phenol degradation processes, the kinetics of the different photo-oxidation reactions being also studied. The results showed that doping either with Re or Ru can lead to enhancement of the TiO2 photocatalytic efficiency and that, among the synthesized samples Ru-doped TiO2 is the most efficient photocatalyst for both the Rhodamine B and phenol photodegradation reactions.
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页数：12
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