Affiliation:
1. Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources College of Chemical Engineering and Modern Materials Shangluo University Shangluo 726000 P. R. China
2. Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversion and New Materials Shangluo University Shangluo 726000 P. R.China
Abstract
AbstractThe construction of heterojunctions is often considered an effective strategy for achieving visible light driven photocatalytic degradation of organic pollutants. In this work, defective g‐C3N4 ultrathin nanosheets were synthesized via alkaline etching method. Subsequently, a S‐scheme heterojunction was constructed between the contact interface of ZnO nanorods and alkaline C3N4 (aC3N4) to promote the electron transfer, resulting in a novel piezo‐photocatalyst (aC3N4/ZnO). The piezo‐photocatalytic performance of aC3N4/ZnO samples with different ratios was studied by adjusting the addition amount aC3N4. In addition, optimum 7 %‐aC3N4/ZnO samples exhibited the highest piezo‐photocatalytic degradation activity under light and ultrasonic irradiation with MB as the target pollutant, exhibiting the 99.89 % degradation rate and 65.68 % mineralization rate within 50 minutes. The capture experiments showed that 1O2,⋅O2− and ⋅OH were active substances in promoting the performance of piezo‐photocatalysis. The mechanism studies indicated that the enhanced piezo‐photocatalytic activity can be attributed to the synergistic effect of the piezoelectric properties of ZnO and the S‐scheme heterojunction formed at the aC3N4/ZnO interfaces, which provides power for the separation and transport of electron and hole. This work highlights the importance of carefully construction S‐scheme heterojunction and defective structures to precisely understand the catalytic properties, benefiting catalytic design and development.