Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 34, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/s10854-023-10140-3
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In this study, a NaNbO3/g-C3N4 heterojunction photocatalyst was prepared and applied for efficient piezo-photocatalysis. The attachment of NaNbO3 nanowires to the g-C3N4 surface facilitated the degradation of rhodamine B by visible-light irradiation and ultrasonic vibration. The NaNbO3/g-C3N4 heterojunction exhibited a higher reaction rate constant and the primary active species for rhodamine B degradation was identified as center dot O-2(-). The enhanced performance was attributed to the formation of the heterojunction and the piezoelectric field of NaNbO3 nanowires promoting charge carriers separation efficiency.
The recombination of charge carriers in photocatalysts is one of the main factors restricting photocatalytic performance. In this paper, the NaNbO3/g-C3N4 heterojunction photocatalyst was prepared by a simple ultrasonic mixing approach and applied to obtain superior piezo-photocatalytic activity. The results showed that the NaNbO3 nanowires were attached to the g-C3N4 surface for efficient degradation of rhodamine B (RhB). Through the synergistic action of visible-light irradiation and ultrasonic vibration, the RhB solution could be degraded within 30 min by 5% NaNbO3/g-C3N4 heterojunction. The reaction rate constant (k) of 5% NaNbO3/g-C3N4 heterojunction is 2.7 times that of pure g-C3N4. Moreover, quenching tests and electronic spin resonance (ESR) indicated that center dot O-2(-) was the primary active species for RhB degradation. The enhanced photocatalytic performance was attributed to the formation of the heterojunction at the NaNbO3/g-C3N4 interface. Furthermore, the piezoelectric field that originated from the bending deformation of NaNbO3 nanowires effectively promoted charge carriers separation efficiency in the NaNbO3/g-C3N4 heterojunction.
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