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Highly efficient photocatalysis toward tetracycline of nitrogen doped carbon quantum dots sensitized bismuth tungstate based on interfacial charge transfer.
Journal of Colloid and Interface Science 2018 Februrary 2
In this study, a novel N-CQDs/Bi2 WO6 was synthesized through a facile hydrothermal method. Multiple techniques were applied to investigate the structures, morphologies, optical and electronic properties and photocatalytic performance of as-prepared samples. The results indicated that the hybrid materials were formed with N-CQDs attached on the surface of sphere-like Bi2 WO6 . The photocatalytic activity of N-CQDs/Bi2 WO6 materials was evaluated sufficiently by using tetracycline (TC) as target organic pollutant. N-CQDs/Bi2 WO6 -5 displayed superior photocatalytic efficiency with nearly 97% removal of TC in 25min and 86.37% mineralization in 90min. The degradation reaction coefficient (kobs) was approximately two times higher than pure Bi2 WO6 as a result of the synergistic effects of N-CQDs and Bi2 WO6. Increased light harvesting capacity, excellent electron transfer ability and improved molecular oxygen activation ability were obtained in N-CQDs/Bi2 WO6 hybrid materials caused by N-CQDs. The present study demonstrated that N-CQDs modification was an effective way to improve photocatalytic efficiency, which can be extended to a general strategy for other semiconductors. The study indicated that novel N-CQDs/Bi2 WO6 has a great potential for rapid and efficient treatment of organic pollutants in water.
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