Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 695, Issue -, Pages 60-69Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.10.177
Keywords
Au nanoparticles; Na2Ta2O6; Nitrobenzenes reduction; Photocatalysis; Photo-synergetic reaction
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Funding
- National Natural Science Foundation of China [21267014, 21567017]
- Project of Scientific and Technological Innovation Team of Inner Mongolia University [12110614]
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In this work, a series of Au-loaded Na2Ta2O6 nanocomposite photocatalysts were prepared via a chemical reduction process. It was observed the tiny Au nanoparticles (similar to 5 nm) uniformly anchored on the surface of Na2Ta2O6 nanoparticles with a well crystallized octahedral morphology. The as-prepared samples demonstrated high efficiency and good recyclability toward reduction of toxic nitrobenzenes to nontoxic aminobenzene. Significantly, a very quickly rate of 2666.7 min(-1) g(-1) under the simulated solar light irradiation was observed for nitrobenzenes (NB) derivatives reduction. It was found 4-nitrophenol can be completely converted to 4-aminobenzene in only 4 min, 2.35 times higher than that in dark. By evaluate activities over several representative support materials under different reaction conditions, a new photo-synergistic catalytic mechanism was proposed. In the thermocatalytic process, the surface plasmons resonance of Au nanoparticles excited by visible light, and the electron transfer from Na2Ta2O6 semiconductor to Au nanoparticle assisted by ultraviolet light, all make the significantly contributions to achieve the efficient reduction of 4-nitrophenol under solar illumination. (C) 2016 Elsevier B.V. All rights reserved.
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