Visible light-responded C, N and S co-doped anatase TiO2 for photocatalytic reduction of Cr(VI)

被引:42
|
作者
Lei, X. F. [1 ,2 ,3 ,4 ,5 ]
Xue, X. X. [2 ,3 ,4 ,5 ]
Yang, H. [2 ,3 ,4 ,5 ]
Chen, C. [1 ]
Li, X. [1 ]
Pei, J. X. [1 ]
Niu, M. C. [1 ]
Yang, Y. T. [1 ]
Gao, X. Y. [1 ]
机构
[1] Northeastern Univ Qinhuangdao, Sch Resources & Mat, Qinhuangdao 066004, Peoples R China
[2] Northeastern Univ, Inst Met Resource & Environm Engn, Shenyang 110819, Peoples R China
[3] Liaoning Key Lab Met Resource Recycling Sci, Shenyang 110819, Peoples R China
[4] Liaoning Engn & Technol Res Ctr Boron Resource, Comprehens, Utilizat, Shenyang 110819, Peoples R China
[5] Liaoning Prov Univ Key Lab Boron Resource Ecol Ut, Shenyang 110819, Peoples R China
基金
中国国家自然科学基金;
关键词
(C; N and S) co-doping; Thiourea content; Cr(VI); Photocatalytic activity; TEMPERATURE SOLVOTHERMAL SYNTHESIS; ACID ORANGE 7; HEXAVALENT CHROMIUM; ONE-STEP; AQUEOUS-SOLUTION; ZINC-OXIDE; PHOTOREDUCTION; SPECTROSCOPY; ADSORPTION; MECHANISM;
D O I
10.1016/j.jallcom.2015.04.233
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The (C, N and S) co-doped TiO2 (TH-TiO2) samples were synthesized by a sol-gel method calcined at 500 degrees C, employing butyl titanate as the titanium source and thiourea as the dopant. The structures of TH-TiO2 samples were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), Xray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS), photoluminescence (PL) spectroscopy, Thermo gravimetry and differential thermal analysis (TG-DTA), Scanning electron microscopy (SEM) and nitrogen adsorption-desorption isotherms. The photocatalytic activities were checked through the photocatalytic reduction of Cr(VI) as a model compound under visible light irradiation. The results showed that the thiourea content played an important role on the microstructure and photocatalytic activity of the samples. According to XPS results, (C, N and S) atoms were successfully co-doped into the nanostructures of TH-TiO2 samples. TH-TiO2 samples with thiourea: Ti molar ratio of 1.5 exhibits higher photocatalytic activity than that of the other samples under visible light irradiation, which can be attributed to the synergic effect of the pure anatase structure, the higher light absorption characteristics in visible regions, separation efficiency of electronehole pairs, the specific surface area and the optimum (C, N and S) content. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:541 / 549
页数:9
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