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Lei X.F.,Northeastern University China | Lei X.F.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Lei X.F.,Liaoning Prov Universities Key Laboratory Of Boron Rsrc Ecol | Xue X.X.,Northeastern University China | And 5 more authors.
Applied Surface Science | Year: 2014

Ag-doped TiO2 nanomaterials (Ag-TiO2) were prepared by a sol-gel method. The structures of Ag-TiO2 nanomaterials were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (DRS), X-ray photoluminescence (PL) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), 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 Ag doping and the calcination temperature played an important role on the microstructure and photocatalytic activity of the samples. Ag-doped TiO2 samples calcinated at 400°C exhibits higher photocatalytic activity than that of the other samples under visible light irradiation. © 2014 Elsevier B.V. All rights reserved. Source


Lei X.F.,Northeastern University China | Lei X.F.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Lei X.F.,Liaoning Prov Universities Key Laboratory Of Boron Rsrc Ecol | Chen C.,Tongji University | And 7 more authors.
Separation and Purification Technology | Year: 2016

The La and C co-doped anatase TiO2 nano-materials were synthesized by a hydrothermal method. The structures of La and C co-doped TiO2 were characterized by XRD, FT-IR, XPS, DRS, SEM and nitrogen adsorption-desorption isotherms. The results indicated that pH values have a greater effect on the crystalline phase, crystal size and crystallinity degree of TiO2. The La and C co-doping could inhibit the phase transformation and crystallite growth of TiO2. The photocatalytic activities of La and C co-doped TiO2 for photocatalytic reduction of Cr(VI) under visible light irradiation using different La contents were also studied. The La and C co-doped TiO2 nano-materials with La:Ti weight ratio of 0.3 exhibits the highest photocatalytic activity for Cr(VI) photocatalytic reduction under visible light irradiation, which can be attributed to the synergic effect of the higher BET surface area, surface hydroxyl content and optimum La contents. © 2016 Elsevier B.V. All rights reserved. Source


Lei X.F.,Northeastern University China | Lei X.F.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Lei X.F.,Liaoning Prov Universities Key Laboratory Of Boron Rsrc Ecol | Xue X.X.,Northeastern University China | And 11 more authors.
Journal of Alloys and Compounds | Year: 2015

The (C, N and S) co-doped TiO2 (TH-TiO2) samples were synthesized by a sol-gel method calcined at 500 °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), X-ray 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 electron-hole pairs, the specific surface area and the optimum (C, N and S) content. © 2015 Elsevier B.V. All rights reserved. Source

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