一步火焰辅助热解法制备可见光响应的嵌碳Mn掺杂TiO2微球

doi:10.15541/jim20150124

摘要/Abstract

摘要：

通过一步火焰辅助热解法制备不同Mn掺杂量的嵌碳TiO₂微球, 利用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)、紫外可见漫反射谱(DRS)、X射线能谱(XPS)、拉曼光谱对其进行表征。SEM和XRD结果表明所制备的TiO₂为微球形貌, 且具有锐钛矿晶型, XPS和Raman分析表明Mn掺入TiO₂晶格, 紫外可见漫反射谱显示引入Mn后可增强对可见光的吸收。Mn掺杂嵌碳TiO₂微球在可见光下对亚甲基蓝(MB)具有更强的降解能力。与其他方法相比, 本方法具有简单, 便捷, 对环境友好, 无需热处理的优点, 可用于制备其他金属元素掺杂的样品, 具有较大的应用潜力。

关键词: TiO2, 光催化剂, 火焰辅助法, 微球, Mn掺杂

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

中图分类号:

TB321

孙通, 陈阳, 马晓清, 李忠, 李绘，崔晓莉. 一步火焰辅助热解法制备可见光响应的嵌碳Mn掺杂TiO₂微球[J]. 无机材料学报, 2015, 30(9): 1002-1008.

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.

图/表 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

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一步火焰辅助热解法制备可见光响应的嵌碳Mn掺杂TiO₂微球

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

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