Microscale Hierarchical Three-Dimensional Flowerlike TiO 2 /PANI Composite: Synthesis, Characterization, and Its Remarkable Photocatalytic Activity on Organic Dyes under UV-Light and Sunlight Irradiation

作者：Na Guo, Yimai Liang, Shi Lan, Lu Liu, Junjun Zhang, Guijuan Ji, Shucai Gan · 发表于：The Journal of Physical Chemistry C · 年份：2014 · DOI：10.1021/jp5044927 · 被引用次数：143 · 研究领域：Advanced Photocatalysis Techniques、Conducting polymers and applications、Polyoxometalates: Synthesis and Applications

A microscale hierarchical 3D flowerlike TiO 2 /PANI composite with enhanced photocatalytic activity was synthesized via a sol–gel method, and the as-synthesized samples were characterized by XRD, SEM, TEM, FT-IR, UV–vis adsorption, BJH, and TGA/DSC. The outcome of the photocatalytic experimental demonstrating the TiO 2 /PANI hybrid with a Ti/ANI (aniline) molar ratio of 1:1 (denoted as T/P) showed high photocatalytic activity upon the degradation of Congo red (CR) and methyl orange (MO) under both UV-light and sunlight irradiation. The unique hierarchical 3D flowerlike structure endows the T/P hybrid with a large surface area of 38.81 m 2 /g. The intermeshed PANI nanoflakes could make full use of the light resource by multiple reflections between the nanoflakes. Moreover, the intrinsic cavity of the hollow TiO 2 nanoparticles can also increase the light-capturing efficiency. The synergistic effect between PANI and TiO 2 hollow nanoparticles results in a reduction of the photoinduced electron–hole recombination rate as well as enhanced photocatalytic activity under UV-light and sunlight. Given the unique spatial structure and high photocatalytic characteristics of the T/P composite, there is great potential for applications in water treatment.