Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 696, Issue -, Pages 988-995Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.12.069
Keywords
Photocatalysis; Piezoelectric effect; Charge separation; PMN-PT; TiO2
Categories
Funding
- National Natural Science Foundation of China [51303079, 51502143]
- Natural Science Foundation of Jiangsu Province [BK20141459, BK20150919]
- Qing Lan Project
- Six Talent Peaks Project in Jiangsu Province [XCL-029]
- Project on the Integration of Industry, Education and Research of Jiangsu Province [BY2015005-16]
- Key University Science Research Project of Jiangsu Province [15KJB430022]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)
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Efficient charge separation is a vital factor to gain high photocatalytic activity. Alternative spatial electric field generated by piezoelectric effect could significantly accelerate charge separation when introduced into photocatalyst system. In this work, famous piezoelectric lead magnesium niobate-lead titanate 0.675Pb(Mg1/3Nb2/3)O-3-0.325PbTiO(3) (PMN-PT) was firstly constructed with TiO2 to prepare composite photocatalyst PMN-PT@TiO2. The results indicate that the alternative spatial electric field, excited by ultrasonic wave vibration, greatly improves the photocatalytic degradation efficiency of rhodamine B (RhB) over PMN-PT@TiO2 by about 50%. The durability experiments suggest that PMN-PT@TiO2 can keep excellent photocatalytic stability even after several runs. Moreover, in the photocatalytic degradation of methylene blue (MB), the enhancement effect of alternative spatial electric field on photocatalytic performance is also observed. Importantly, this study provides a general method for constructing piezoelectric-based photocatalyst to capture solar energy, acoustic wave energy and wind energy, which will realize multi-field energy coupling and high photocatalysis. (C) 2016 Elsevier B.V. All rights reserved.
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