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Three Dimensional Carbogenic Dots/TiO2 Nanoheterojunctions With Enhanced Visible Light-driven Photocatalytic Activity

Jincheng Liu, Wenyu Zhu, Shuyan Yu, Xiaoli Yan
Published 2014 · Materials Science

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Abstract Functional carbogenic quantum dots (C-dots) were synthesized by a pyrolysis approach with strong visible light absorption and high photoluminescence. The novel three dimensional (3D) hierarchical C-dots-TiO 2 (C-TiO 2 ) heterojunctions were obtained by assembling the C-dots with end carboxylic acid groups on the surface of 3D TiO 2 nanorod spheres, and confirmed by scanning electron microscopy and transmission electron microscopy analyses. The prepared C-dots show strong adsorption of rhodamine B (RhB) and very low activity in the photocatalytic degradation of RhB under visible light irradiation. The prepared 3D C-TiO 2 composites show enhanced visible light absorption and higher surface area with the increase of C-dot ratios. The highest photocatalytic activity is obtained at the carbon weight percent of 3.6%, and the corresponding apparent first-order rate constant of 0.00616 min −1 which is 1.8 times of that by the pure 3D TiO 2 sphere. The mechanism shows that C-dots play an important role in the donation of excited electron to the conduction band of TiO 2 under visible light irradiation.
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