resumo
Increasing the exposure of active sites and improving the intrinsic activity are necessary considerations for designing a highly efficient photocatalyst. Herein, an In2S3/AgI stable Z-scheme heterojunction with highly dispersed AgI nanoparticles (NPs) is synthesized by the mild self-templated and in-situ ion exchange strategy. Impressively, the optimized In2S3/AgI-300 Z-scheme heterojunction exhibits superior photodegradation activity (0.020 min-1) for the decomposition of insecticide imidacloprid (IMD), which is extremely higher than that of pure In2S3 (0.002 min-1) and AgI (0.013 min-1). Importantly, the three-dimensional excitation-emission matrix (3D EEMs) fluorescence spectra, high-resolution mass spectrometry (HRMS), the photoelectrochemical tests, radical trapping experiment, and electron spin resonance (ESR) technique are performed to clarify the possible degradation pathway and mechanism of IMD by the In2S3/AgI-300 composite. The enhanced photocatalytic performance is attributed to the highly dispersed AgI NPs on hierarchical In2S3 hollow nanotube and the construction of In2S3/AgI Z-scheme heterojunction, which can not only increase active site exposure, but also improve its intrinsic activity, facilitating rapid charge transfer rate and excellent electron-hole pairs separation efficiency. Meanwhile, the practical application potential of the In2S3/AgI-300 composite is systematically investigated. This study opens a new insight for designing catalysts with high photocatalytic performance through a convenient approach.
palavras-chave
REDUCED GRAPHENE OXIDE; PHOTOCATALYTIC DEGRADATION; PATHWAYS; HYDROGEN
categoria
Chemistry
autores
Weng, JS; Chen, J; Xu, YF; Hu, XR; Guo, CY; Yang, Y; Sun, JY; Fu, LS; Wang, Q; Wei, JM; Yang, TH
nossos autores
Lianshe Fu
Investigador AuxiliarProjectos
Nano-argilas para remoção/captura de fosfatos (P) e sua reutilização como fertilizante (NATURAL)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was supported by the National Natural Science Foundation of China (No. 51973173), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (23KJA430007) and the College Students Training Program of Innovation and Entrepreneurship of Jiangsu Province (KYX23013). This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC). We also thank the Analytical and Testing Center at Jiangsu University of Technology for measuring PXRD. The authors would like to thank Qian Zhang from Shiyanjia Lab (www.shiyanjia.com) for the SEM analysis.