Cu掺杂TiO<sub>2</sub>纳米管可见光催化矿化甲苯

引用本文: 赵伟荣, 奚海萍, 廖求文. Cu掺杂TiO₂纳米管可见光催化矿化甲苯[J]. 物理化学学报, 2013, 29(10): 2232-2238. doi: 10.3866/PKU.WHXB201308291 shu

Citation: ZHAO Wei-Rong, XI Hai-Ping, LIAO Qiu-Wen. Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene[J]. Acta Physico-Chimica Sinica, 2013, 29(10): 2232-2238. doi: 10.3866/PKU.WHXB201308291 shu

Cu掺杂TiO₂纳米管可见光催化矿化甲苯

基金项目:
国家自然科学基金(51178412, 51278456) (51178412, 51278456)

浙江省教育厅科研项目(Z201122663)资助 (Z201122663)

摘要:

采用低温水热法制备氢钛酸管, 通过吸附-煅烧法制备Cu掺杂TiO₂纳米管(Cu-TNT)催化剂. 利用X射线衍射(XRD)、电感耦合等离子体-原子发射光谱(ICP-AES)、X射线光电子能谱(XPS)、透射电镜(TEM)、紫外-可见漫反射光谱(UV-Vis-DRS)和电化学测试手段对样品进行表征, 并进行平面波赝势密度泛函理论(DFT)计算. 结果表明, 样品中Cu/Ti原子比接近理论值, Cu掺杂进入TiO₂晶格内部, 诱发催化剂可见光活性. 掺Cu后,Cu 3d轨道和O 2p轨道杂化形成价带顶, 价带负向偏移, 样品禁带宽度减小为2.50-2.91 eV, 具有可见光响应.以甲苯为模型污染物研究催化剂对挥发性有机化合物(VOCs)的催化去除和矿化效果. 未掺杂的TNT可见光催化活性较差; Cu掺杂量超过0.1%(Cu/Ti原子比)时, 样品催化活性也减弱; Cu掺杂量为0.1%的催化剂具有最佳可见光催化氧化能力, 7 h内甲苯的去除率达77%, 甲苯的矿化率达59%.

关键词:

English

Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene

1.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China
Received Date: 21 May 2013
Available Online: 26 September 2013
Fund Project:
国家自然科学基金(51178412, 51278456)

浙江省教育厅科研项目(Z201122663)资助

Abstract:

Based on hydrogen titanate nanotubes prepared by a low-temperature hydrothermal technique, Cu-doped titania nanotube (Cu-TNT) catalysts were prepared using absorption-calcination methods. They were characterized by X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS), and electrochemical techniques. Density functional theory (DFT) was used to calculate the nanotube band structure and density of states. Cu/Ti atomic ratios in the synthesized powders were very close to the nominal values, and the Cu-doped TiO₂ lattice exhibited improved visible-light absorption. This was because the valence band, formed by hybridization of O 2p states with Cu 3d states, was negatively shifted. Thus, the band gap was reduced to 2.50-2.91 eV and the samples exhibited visible-light responses. Toluene was chosen as a model pollutant to evaluate the removal capacity and the CO₂ mineralization rate of volatile organic compounds under visible light. Pure TNT displayed poor visible-light activity, and the activities of samples with >0.1% Cu doping were also weak. Samples doped with 0.1% Cu exhibited optimumvisible-light photocatalytic oxidation activity, with a 77%toluene degradation efficiency and a 59%mineralization rate in 7 h.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Cu掺杂TiO₂纳米管可见光催化矿化甲苯

English

Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

Cu掺杂TiO2纳米管可见光催化矿化甲苯

English

Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

Cu掺杂TiO₂纳米管可见光催化矿化甲苯

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs