Facile Synthesis of Visible Light Activated Carbon-incorporated Mn Doped TiO2 Microspheres via Flame Thermal Method

doi:10.15541/jim20150124

Abstract

Abstract:

Carbon-incorporated Mn doped TiO₂ (C/Mn-TiO₂) microspheres with different Mn contents were prepared by a facile and novel flame assisted approach. The influence of the Mn contents on the morphology and performance was investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), ultraviolet-visible diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectra (XPS) and Raman spectra, respectively. SEM and XRD results showed the existence of anatase TiO₂ microspheres without post-heat treatment. XPS and Raman results confirmed Mn²⁺ substitution of Ti⁴⁺in the resulted samples. UV-Vis diffuse reflectance spectra showed that the incorporation of Mn into TiO₂ lattice could enhance visible light absorption. Improved photocatalytic activity for the degradation of methylene blue (MB) under visible light illumination was demonstrated with the introduction of Mn dopant. The introduction of Mn resulted in the narrowed band gap in C/Mn-TiO₂. This study offers not only an environmentally friendly product with high photocatalytic activity, but also a rapid and direct strategy without any particular skill.

Key words: TiO2, photocatalyst, flame thermal method, microsphere, Mn doped

CLC Number:

TB321

SUN Tong, CHEN Yang, MA Xiao-Qing, LI Zhong, LI Hui, CUI Xiao-Li. Facile Synthesis of Visible Light Activated Carbon-incorporated Mn Doped TiO₂ Microspheres via Flame Thermal Method[J]. Journal of Inorganic Materials, 2015, 30(9): 1002-1008.

Figures/Tables 8

Fig. 1 XRD patterns of the as-prepared C/TiO2 (a) and C/Mn- TiO2 (b-d)

Fig. 2 XPS spectra (a-e) and laser Raman spectra (f) for the samplesXPS for Ti2p core level (a), C1s core level of C/TiO2 (b) and C/0.5% Mn-TiO2 (c), O1s core level of C/TiO2 (d) and C/0.5% Mn-TiO2 (e). Laser Raman spectra (f) of C/TiO2 (red), C/0.5% Mn-TiO2 (black), respectively, and the enlarged view of the intense Eg peak (insert in (f))

Fig. 3 SEM images of the as-prepared C/TiO2 (a) and C/Mn- TiO2 (b-d) The content of Mn in samples is 0.1% (b), 0.5 % (c) and 1% (d), respectively

Fig. 4 EDX spectra of C/1% Mn-TiO2

Fig. 5 UV-Vis diffuse reflectance spectra of as-prepared C/ TiO2 and C/Mn-TiO2

Fig. 6 Band gaps of as-prepared C/TiO2 and C/Mn-TiO2

Table 1 Optical indirect band gaps of C/TiO2 and C/Mn-TiO2

Mn doping	0	0.1%	0.5%	1.0%
Optical indirect band gap /eV	3.19	3.00	2.87	2.73

Fig. 7 Photocatalytic activity of the samples in degradation of MB under visible light illumination C/TiO2 (a) and C/Mn-TiO2 (b-d). The content of Mn is 0.1% (b), 0.5% (c) and 1% (d), respectively

References 35

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Facile Synthesis of Visible Light Activated Carbon-incorporated Mn Doped TiO₂ Microspheres via Flame Thermal Method

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