Publication Date:
2013-08-27
Description:
The Ag 3 PO 4 and Ag 3 PO 4 sonocatalysts with surface enrichment of Br − anions ( Br – Ag 3 PO 4 ) were synthesized using a facile precipitate process. Various analysis, including X-ray diffraction, transmission electron microscopy, scanning electron microscope, Brunauer–Emmett–Teller, photoluminescence (PL) spectra, and UV–Vis absorption spectra were carried out to investigate the property and structure. The effect of a variety of changing conditions on ultrasonic degradation of organic dye has been investigated. Both of them exhibited obvious activity for sonocatalytic degradation of organic dyes. However, Br – Ag 3 PO 4 sonocatalysts showed much higher activity than that of Ag 3 PO 4 . By XRD analysis, the Br − anions of the surface of Ag 3 PO 4 has been transformed into AgBr in the preparation process. The high activity could be attributed to AgBr for modifying Ag 3 PO 4 . By detecting hydroxyl radicals (· OH ) in the reactive solution, we found that AgBr on the surface of Ag 3 PO 4 can help to produce a lot of additional · OH radicals. These · OH radicals may be significant reason to improve Ag 3 PO 4 activity, which further proved the · OH radical mechanism of Ag 3 PO 4 degradation of dyes under ultrasonic radiation. In addition, kinetic analysis and sonocatalytic mechanism were discussed in detail.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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