Environmental pollution has become an imminent problem for the healthy and sustainable development of human society. Although photocatalytic degradation of organic pollutants over semiconductors was recognized as a promising strategy to resolve this problem, the degradation activity of most of photocatalysts was unsatisfactory owing to the rapid recombination of photogenerated electron-hole pairs. In this work, significantly enhanced degradation performance for RhB organic dye over graphite carbon nitride (g-C₃N₄) photocatalyst were demonstrated, resulting from the synergetic photocatalytic and piezocatalytic effects. The photocatalytic and piezocatalytic degradation properties of g-C₃N₄ photocatalyst and the influence of nitrogen defects on them were investigated respectively. With the synergetic functions of light irradiation and mechanical vibration, the synergistic degradation performance is significantly greater than the sum of single photocatalysis and piezocatalysis owing to the recombination of photogenerated carries could be inhibited effectively by the created piezoelectric field in g-C₃N₄ nanosheets. These findings proved that the coupling of photocatalytic and piezocatalytic properties of semiconductors opens a new gateway to remove organic contaminants.

环境污染已成为人类社会健康可持续发展迫在眉睫的问题。尽管在半导体上光催化降解有机污染物被认为是解决这一问题的有前途的策略，但由于光生电子-空穴对的快速复合，大多数光催化剂的降解活性并不令人满意。在这项工作中，由于协同的光催化和压电催化效应，证明了 RhB 有机染料的降解性能比石墨氮化碳 (gC ₃ N ₄ ) 光催化剂显着增强。gC ₃ N ₄的光催化和压电催化降解性能分别研究了光催化剂和氮缺陷对它们的影响。由于gC ₃ N ₄纳米片中产生的压电场可以有效抑制光生载流子的复合，在光照射和机械振动的协同作用下，协同降解性能显着大于单一光催化和压电催化的总和。这些发现证明，半导体的光催化和压电催化特性的耦合为去除有机污染物开辟了新的途径。