CNTs/TiO2复合物制备及光催化性能研究

doi:10.15541/jim20150078

摘要/Abstract

摘要：

在不使用表面活性剂的情况下, 采用溶胶-凝胶法成功制备CNTs/TiO₂复合物, 利用XRD、TEM、HRTEM和SAED对样品的结构和形貌进行了表征。选取亚甲基蓝溶液为目标降解物, 利用紫外-可见(UV-Vis)分光光度计考察了CNTs/TiO₂复合物的光催化活性, 系统研究了CNTs掺杂量对催化降解效率的影响。实验结果表明: 经450℃煅烧, 锐钛矿相TiO₂通过C-O-Ti键均匀地涂覆在CNTs表面, TiO₂颗粒尺寸约16 nm。CNTs/TiO₂复合物光催化活性明显高于纯TiO₂, 当CNTs掺杂量为1wt%时, CNTs/TiO₂复合物对亚甲基蓝的催化降解效率最高, 比纯TiO₂提高11.7%。

关键词: 碳纳米管, 二氧化钛, 光催化活性

Abstract:

CNTs/TiO₂ nanocomposites were prepared by Sol-Gel method without any surfactant. The as-prepaired samples were characterizated by using X-ray diffraction, transmission electron microscope, high resolution transmission electron microscopy, selected area electron diffraction and UV-Vis spectrophotometer. The degradation experiment of the methylene blue under UV-light was used to evaluate the catalytic activity of the CNTs/TiO₂ catalysts, and the influence factors of catalytic efficiency such as CNTs doping concentration were studied systematically. The results suggest that the anatase titanium dioxide coat on the surfaces of CNTs uniformly in the form of C-O-Ti after annealing at 450℃, and the size of TiO₂ nano-particle is about 16 nm. Moreover, CNTs/TiO₂nanocomposites show a distimctive photodegradation efficiency, CNTs/TiO₂ nanocomposites with 1wt% CNTs present an increase of photodegradation efficiency by 11.7% as regarding to pure TiO₂.

Key words: CNTs, TiO2, photodegradation efficiency

中图分类号:

O643

马葆禄, 张玥. CNTs/TiO₂复合物制备及光催化性能研究[J]. 无机材料学报, 2015, 30(9): 937-942.

MA Bao-Lu, ZHANG Yue. Synthesis and Photocatalytic Activity of Carbon Nanotubes/Titanium Dioxide Nanocomposites[J]. Journal of Inorganic Materials, 2015, 30(9): 937-942.

图/表 9

图1 不同烧结温度下得到的TiO2的光催化活性

Fig. 1 Photocatalytic activity of TiO2 calcined at different temperatures

图2 不同CNTs掺杂量CNTs/TiO2复合物的光催化活性

Fig. 2 Photocatalytic activity of the CNTs/TiO2 doped with different amounts of CNTs

图3 不同产物的紫外可见吸收光谱图

Fig. 3 UV-Vis absorption spectra of samples

图4 纯TiO2和1wt%CNTs/TiO2复合物的XRD谱图

Fig. 4 XRD patterns of the pure TiO2 and 1wt% CNTs/TiO2

图5 CNTs/TiO2复合物的透射电镜照片

Fig. 5 TEM images of CNTs/TiO2

图6 预处理CNTs的红外光谱图

Fig. 6 IR spectra of pre-treated CNTs

图7 CNTs/TiO2红外光谱图

Fig. 7 IR spectra of CNTs/TiO2

图8 CNTs/TiO2复合过程示意图

Fig. 8 Formation process of CNTs/TiO2

图9 CNTs/TiO2复合物光催化示意图

Fig. 9 Photocatalysis mechanism of CNTs/TiO2 nanocomposites

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CNTs/TiO₂复合物制备及光催化性能研究

Synthesis and Photocatalytic Activity of Carbon Nanotubes/Titanium Dioxide Nanocomposites

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