| 多壁碳纳米管/TiO2复合材料的合成 及其光催化性能 |
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| 引用本文： | 杜瑞安,马小帅,张萌迪,陈范云,余长林.多壁碳纳米管/TiO2复合材料的合成 及其光催化性能[J].有色金属科学与工程,2019,10(5):75-84. |
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| 作者姓名： | 杜瑞安 马小帅 张萌迪 陈范云 余长林 |
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| 作者单位： | 江西理工大学材料冶金化学学部,江西 赣州,341000;江西理工大学材料冶金化学学部,江西 赣州,341000;江西理工大学材料冶金化学学部,江西 赣州,341000;江西理工大学材料冶金化学学部,江西 赣州,341000;江西理工大学材料冶金化学学部,江西 赣州,341000 |
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| 基金项目： | 国家自然科学基金资助项目21567008国家自然科学基金资助项目21707055江西理工大学清江拔尖人才支持计划资助项目江西省5511科技创新人才计划资助项目20165BCB18014江西省主要学科学术带头人资助项目20172BCB22018江西省自然科学基金资助项目20161BAB203090 |
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| 摘 要： | TiO2被广泛应用于环境污染治理、新能源转换以及传感器等领域.通过负载导电材料复合(碳纳米管）拓宽纳米TiO2的光谱响应范围，提高光生电子-空穴对分离效率，是有效提高TiO2光催化性能的研究手段.以多壁碳纳米管和钛酸异丙酯为原料，采用溶胶-凝胶法合成碳纳米管负载的TiO2光催化剂.利用X射线单晶粉末衍射（XRD）、比表面积（BET）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、激光拉曼（Raman）、紫外-可见漫反射吸收光谱（UV-vis DRS）等对催化剂进行表征.通过在365 nm紫外光照射下，光催化降解亚甲基蓝来研究不同含量碳纳米管负载对TiO2光催化活性的影响.结果表明，负载2%碳纳米管的TiO2光催化效果有明显提高，对亚甲基蓝的降解率达90.6%.碳纳米管负载后，样品的比表面积增大，可见光吸收能力和光电流强度增强，光生电子寿命增长.同时，碳纳米管与TiO2构建了紧密的界面接触关系引起Ti-O键的缩短而有利于光生电子和空穴的分离从而产生大量h+、·OH和超氧自由基等活性基团，能有效提高光催化性能.
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| 关 键 词： | 二氧化钛 溶胶-凝胶法 碳纳米管 负载 光催化 |
| 收稿时间： | 2019-04-05 |
Synthesis of multi-walled carbon nanotubes/TiO2 composites and their photocatalytic performance |
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| Affiliation: | Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China |
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| Abstract: | TiO2 is widely used in environmental pollution management, new energy conversion and sensors, etc. Broadening the spectral response range of nano-TiO2 proves to be an effective research method to improve the photocatalytic performance of TiO2 as the separation efficiency of electron-positron pair photoproduction can improve a lot. In this paper, multi-walled carbon nanotubes and isopropyl titanate are used as raw materials to synthesize TiO2 photocatalyst supported on carbon nanotubes by sol-gel method. The catalyst is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Raman and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), etc. The photocatalytic degradation of methylene blue by 365 nm ultraviolet irradiation is observed to study the effect of different contents of TiO2 loaded on carbon nanotubes on the photocatalytic activity of TiO2. The experimental results show that the photocatalytic effect of TiO2 has improves a lot when 2% TiO2 is loaded on the carbon nanotube and its degradation rate of methylene blue reaches 90.6 %. After carbon nanotubes are loaded with TiO2, their specific surface area, absorption capacity of visible light, photocurrent intensity, the lifetime of photogenerated electrons all increase. At the same time, the close interfacial contact between carbon nanotubes and TiO2 causes the shortening of Ti-O bonds, which facilitates the separation of photogenerated electrons and holes, producing a large number of active groups such as h+, ·OH and super-oxygen free radicals that can effectively improve the photocatalytic properties of TiO2. |
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