Journal
CARBON
Volume 79, Issue -, Pages 369-379Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.07.079
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Funding
- Nanyang start-up Grants [SUG: M4081044]
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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-TiO2 (C-TiO2) heterojunctions were obtained by assembling the C-dots with end carboxylic acid groups on the surface of 3D TiO2 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-TiO2 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 TiO2 sphere. The mechanism shows that C-dots play an important role in the donation of excited electron to the conduction band of TiO2 under visible light irradiation. (C) 2014 Elsevier Ltd. All rights reserved.
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