期刊
WATER RESEARCH
卷 81, 期 -, 页码 366-374出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.06.018
关键词
Natural indoor weak light; Dye wastewater; Silver salts; Stabilities; Photocatalysis
资金
- National Science Foundation of China [21377060, 21103049]
- Science and Technology Infrastructure Program of Jiangsu [BM201380277, 2013139]
- Jiangsu Science Foundation of China [BK2012862]
- Six Talent Climax Foundation of Jiangsu [20100292]
- Jiangsu Province of Academic Scientific Research Industrialization Projects [JHB2012-10, JH10-17]
- Key Project of Environmental Protection Program of Jiangsu [2013016, 2012028]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) - SRF for ROCS, SEM [2013S002]
- 333 Outstanding Youth Scientist Foundation of Jiangsu [2011015]
As a high-quantum-efficiency photocatalyst, the serious photo-corrosion of silver phosphate (Ag3PO4), limits the practical applications in water purification and challenges us. Herein, Ag3PO4 is found to have a high stability under natural indoor weak light irradiation, suggesting that we can employ it by adopting a new application strategy. In our studies, rhodamine B (RhB, cationic dye), methyl orange (MO, anionic dye) and RhB-MO mixture aqueous solutions are used as the probing reaction for the degradation of organic wastewater. It is found that RhB, MO and RhB MO can be completely degraded after 28 h under natural indoor weak light irradiation, indicating that multi-component organic contaminants can be efficiently degraded by Ag3PO4 under natural indoor weak light irradiation. The density of natural indoor weak light is measured to be 72cd, which is merely one-thousandth of 300 W xenon lamp (68.2 x 10(3)cd). Most importantly, Ag3PO4 shows a high stability under natural indoor weak light irradiation, demonstrated by the formation of fairly rare Ag. Furthermore, we also investigate the influence of inorganic ions on organic dyes degradation. It shows that the Cl- and Cr6+ ions with high concentrations in wastewater have significantly decreased the degradation rate. From the viewpoint of energy saving and stability, this study shows us that we can utilize the Ag-containing photocatalysts under natural indoor weak light, which could be extended to indoor air cleaning process. (C) 2015 Elsevier Ltd. All rights reserved.
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