Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 280, Issue -, Pages 260-268Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.07.079
Keywords
Ag2CO3; Ag/AgCl; Geothermal water; Photocatalysis; Visible light
Categories
Funding
- National Natural Science Foundation of China [51272107]
- Natural Science Foundation of Jiangsu Province, China [BK2011024]
- Specialized Research Fund for the Doctoral Program of Higher Education, China [20133219110015]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Geothermal water is a clean, cheap and renewable resource and it is widely distributed all over the world. In this work, ternary Ag2CO3/Ag/AgCl photocatalyst has been successfully synthesized via a one-pot precipitation method in natural geothermal water at room temperature, wherein the geothermal water serves as the source of chlorine and carbonate. The results suggest that the Ag/AgCl nanopartides are anchored on the surface of Ag2CO3 and Ag2CO3/Ag/AgCl composite shows strong absorption ability in the visible light region. The evaluation of the photocatalytic activity indicates that the as-synthesized Ag2CO3/Ag/AgCl photocatalyst exhibits higher photocatalytic performance for the degradation of methylene blue (MB) aqueous solution under visible light irradiation than one-component (Ag2CO3), two-component (Ag/AgCl, Ag2CO3/AgCl) and the mechanical mixture of Ag2CO3 and Ag/AgCl. The trapping experiments confirmed that holes (h(+)) and O-center dot(2)- were the two main active species in the photocatalytic process. Finally, a possible Z-scheme photocatalytic mechanism of the charge transfer was proposed for the enhanced photocatalytic performance. This work may open up new insights into the application of cheap geothermal water resources in the word and provide new opportunities for facile fabrication of Ag/AgCl-based photocatalysts. (C) 2014 Elsevier B.V. All rights reserved.
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