Microscale Hierarchical Three-Dimensional Flowerlike TiO2/PANI Composite: Synthesis, Characterization, and Its Remarkable Photocatalytic Activity on Organic Dyes under UV-Light and Sunlight

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• 作者：Na Guo ; Yimai Liang ; Shi Lan ; Lu Liu ; Junjun Zhang ; Guijuan Ji ; Shucai Gan
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：August 14, 2014
• 年：2014
• 卷：118
• 期：32
• 页码：18343-18355
• 全文大小：736K
• ISSN：1932-7455

文摘

A microscale hierarchical 3D flowerlike TiO₂/PANI composite with enhanced photocatalytic activity was synthesized via a sol鈥揼el method, and the as-synthesized samples were characterized by XRD, SEM, TEM, FT-IR, UV鈥搗is adsorption, BJH, and TGA/DSC. The outcome of the photocatalytic experimental demonstrating the TiO₂/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 m²/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 TiO₂ nanoparticles can also increase the light-capturing efficiency. The synergistic effect between PANI and TiO₂ hollow nanoparticles results in a reduction of the photoinduced electron鈥揾ole 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.