Efficient photocatalytic degradation of ibuprofen in aqueous solution using novel visible-light responsive graphene quantum dot/AgVO3 nanoribbons

•A novel heterojunction photocatalyst, GQD/AgVO3 was prepared.•The morphology of GQD/AgVO3 was well characterized.•Ibuprofen was easily decomposed using GQD/AgVO3 under visible-light irradiation.•The degradation pathway of ibuprofen was also suggested. Single crystalline, non-toxicity, and long-term...

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Bibliographic Details
Published in:	Journal of hazardous materials 2016-07, Vol.312, p.298-306
Main Authors:	Lei, Zhen-dong, Wang, Jia-jun, Wang, Liang, Yang, Xiong-yu, Xu, Gang, Tang, Liang
Format:	Article
Language:	eng
Subjects:	AgVO3 nanoribbons Catalysis Catalytic activity Degradation Degradation pathways Graphene Graphene quantum dots Graphite - chemistry Heterojunction photocatalyst Heterojunctions Ibuprofen Ibuprofen - chemistry Light Nanostructure Nanotubes, Carbon - chemistry Photocatalysis Quantum Dots - chemistry Qunatum dots Separation
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Summary:	•A novel heterojunction photocatalyst, GQD/AgVO3 was prepared.•The morphology of GQD/AgVO3 was well characterized.•Ibuprofen was easily decomposed using GQD/AgVO3 under visible-light irradiation.•The degradation pathway of ibuprofen was also suggested. Single crystalline, non-toxicity, and long-term stability graphene quantum dots (GQDs) were modified onto the AgVO3 nanoribbons by a facile hydrothermal and sintering technique which constructs a unique heterojunction photocatalyst. Characterization results indicate that GQDs are well dispersed on the surface of AgVO3 nanoribbons and GQD/AgVO3 heterojunctions are formed, which can greatly promote the separation efficiency of photogenerated electron-hole pairs under visible light irradiation. By taking advantage of this feature, the GQD/AgVO3 heterojunctions exhibit considerable improvement on the photocatalytic activities for the degradation of ibuprofen (IBP) under visible light irradiation as compared to pure AgVO3. The photocatalytic activity of GQD/AgVO3 heterojunctions is relevant with GQD ratio and the optimal activity is obtained at 3wt% with the highest separation efficiency of photogenerated electron-hole pairs. Integrating the physicochemical and photocatalytic properties, the factors controlling the photocatalytic activity of GQD/AgVO3 heterojunctions are discussed in detail. Moreover, potential photocatalytic degradation mechanisms of IBP via GQD/AgVO3 heterojunctions under visible light are proposed.
ISSN:	0304-3894 1873-3336