Nitrogen doped carbon quantum dots mediated silver phosphate/bismuth vanadate Z-scheme photocatalyst for enhanced antibiotic degradation.

Author(s) Zhang, J.; Yan, M.; Yuan, X.; Si, M.; Jiang, L.; Wu, Z.; Wang, H.; Zeng, G.
Journal J Colloid Interface Sci
Date Published 2018 Nov 01
Abstract

A novel nitrogen doped carbon quantum dots (N-CQDs) mediated AgPO/BiVO Z-scheme photocatalyst was synthesized through a solvothermal-precipitation method. The as-prepared photocatalysts were comprehensive characterized by X-ray diffraction, X-ray photo-electron spectroscopy, scanning electron microscopy, transmission electron micrograph, UV-vis diffuse reflection spectroscopy, vis photoluminescence and electron spin resonance analysis. The photocatalytic performances of as-prepared photocatalysts were used for degradation of tetracycline (TC) under visible-light illumination. Results exhibited the increased photocatalytic efficiency of BiVO/N-CQDs/AgPO-10 (AgPO with the mass ratio of BiVO/N-CQDs/AgPO = 10%) to photodegrade TC is up to 88.9% in 30 min and 59.8% mineralization in 90 min. The degradation reaction coefficient (k) is about 6.00, 2.78 and 1.80 times higher than that of BiVO N-CQDs/BiVO and AgPO/BiVO, respectively. The excellent photocatalytic performance of the Z-scheme BiVO/N-CQDs/AgPO was attributed to the construction of Z-scheme system, increased light harvesting capacity and improved molecular oxygen activation ability. Moreover, the photocatalytic activity of BiVO/N-CQDs/AgPO remained 79.9% after five cycling runs, indicating the high stability and reusability of the as-prepared photocatalyst. Additionally, a possible photocatalytic mechanism of the novel Z-scheme BiVO/N-CQDs/AgPO was proposed.

DOI 10.1016/j.jcis.2018.05.109
ISSN 1095-7103
Citation J Colloid Interface Sci. 2018;529:1122.

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