Journal
ULTRASONICS SONOCHEMISTRY
Volume 18, Issue 2, Pages 541-548Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2010.09.012
Keywords
Up-conversion luminescence; Er3+:YAlO3/TiO2-ZnO composite; Sonocatalytic degradation; Sonoluminescence; Azo dyes
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Funding
- National Natural Science Foundation of China
- Liaoning Province Natural Science Foundation of Education Department
- Liaoning Province Natural Science Foundation of Science and Technology Department
- Liaoning university [211]
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In this work, the emphasis was mainly placed on investigating the sonocatalytic activity of TiO2-ZnO mixed with Er3+:YAlO3, namely, Er3+:YAlO3/TiO2-ZnO composite. It is able to utilize the sonoluminescence light to improve the sonocatalytic degradation of organic dyes. The Er3+:YAlO3 as up-conversion luminescence agent was synthesized by sol-gel and auto-combustion method, and then Er3+:YAlO3/TiO2-ZnO composite as sonocatalyst were prepared by ultrasonic dispersion and liquids boil method. The prepared up-conversion luminescence agent and composites were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Acid Red B dye was selected to examine the sonocatalytic activity of Er3+:YAlO3/TiO2-ZnO composite. The degradation reaction processes were monitored by UV-vis spectrophotometer and ion chromatogram. The influences on the activity of the Er3+:YAlO3/TiO2-ZnO such as Ti/Zn molar ratio, heat-treated temperature and heat-treated time were studied. The results showed that the Er3+:YAlO3/TiO2-ZnO composite exhibited a significantly high sonocatalytic activity compared with other catalysts in the degradation of Acid Red B. And the sonocatalyst with 1:1 Ti/Zn molar ratio heat-treated at 550 degrees C for 60 min showed the highest sonocatalytic activity. At last, the experiment also indicated that it has a good sonocatalytic activity to degrade other organic dyes. (C) 2010 Elsevier B.V. All rights reserved.
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