Synthesis of Ruthenium-Doped TiO2 Nanotube Arrays for the Photocatalytic Degradation of Terasil Blue Dye

被引:8
作者
Sandoval Gonzalez, A. [1 ]
Solis-Cortazar, J. C. [2 ]
Pineda-Arellano, C. A. [3 ]
Ramirez-Morales, E. [2 ]
Espinosa de los Monteros, A. [2 ]
Silva-Martinez, S. [1 ,2 ]
机构
[1] Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicadas, Ave Univ 1001, Cuernavaca 62209, Morelos, Mexico
[2] Univ Juarez Autonoma Tabasco, Ave Univ S-N, Villahermosa 86040, Tabasco, Mexico
[3] CONACYT Ctr Invest Opt AC, Prol Constituc 607, Aguascalientes 20200, Aguascalientes, Mexico
关键词
Ru-Doped; TiO2; Nanotubes; Anodization; Photocatalytic Activity; TITANIUM-DIOXIDE; SOL-GEL; THIN-FILMS; PERFORMANCE; COMPOSITE; OXIDATION; ANODIZATION; FABRICATION;
D O I
10.1166/jnn.2019.16823
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The oxidation of terasil blue dye (TB) has been achieved by photocatalysis under UV light using well organized nanotubes of Ti/TiO2 doped with ruthenium (Ru/Ti/TiO2). Ru/Ti/TiO2 were fabricated by Ti anodization followed by impregnation with 0.04, 0.08 and 0.16 wt% of RuCl3 center dot xH(2)O or KRuO4 as precursor salts. Ti foil anodization was carried out in non-aqueous solutions and in aqueous solutions at pH 7 and pH 12.6. Scanning electron microscopy analyses revealed a morphology of well-defined, organized nanotubes of TVTiO(2)and Ru/Ti/TiO2. The ruthenium was evenly distributed over Ti/TiO2 surface. Cluster formation was also observed for 0.16 wt% Ru loading. The X-ray diffraction spectra showed anatase and rutile phase in pure Ti/TiO(2)and Ru/TVTiO2 nanotubes. Therefore, ruthenium doping did not modify the crystalline phase of Ti/TiO2. Raman spectra did not reveal the rutile phase of TiO2 in the composites which is attributed to the laser characteristics used. The optical band gap energies of the Ti/TiO2 and Ru/TVTiO2 nanotube arrays showed that ruthenium-doping on Ti/TiO2 had slight effect on the band-gap energy. A decrease in the band gap energy of pure Ti/TiO2 (E-g= 2.88 eV) was observed by Ru loading of 0.04 wt% in the Ti/TiO(2 )nanotube arrays (E-g = 2.60 eV). The kinetic rate constant of the photocatalytic oxidation of TB, using 0.08 wt% Ru load, was 1.56 and 1.39 times of that on Ti/TiO2 composite (0.01 min(-1)) synthetized at pH 12.6 impregnated in RuCl3 (0.0156 min(-1)) and KRuO4 (0.0139 min(-1)) solutions, respectively. Nevertheless, the highest rate constant value of TB degradation (87.8%) was 0.0172 min(-1) using 0.16 wt% Ru loading on Ti/TiO2 composite synthetized at pH 7 impregnated in RuCl3; this represents 1.15 times of that on Ti/TiO2 composite (0.0150 min(-1); 81.4% color removal) synthetized under the same conditions.
引用
收藏
页码:5211 / 5219
页数:9
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