期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 324, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.122220
关键词
Supramolecular perylene diimide; Plasmonic photocatalyst; Organic pollutants; Antibiotic resistant bacteria; Antibiotic resistance genes
A plasmonic Z-scheme Ag@AgCl/PDI photocatalyst was synthesized using a deposition-photoreduction method. This photocatalyst exhibited improved light absorption ability and enhanced oxidation capacity, leading to remarkable visible-light photocatalytic performance for the elimination of organic pollutants and antibiotic resistant bacteria and genes. The degradation rates of the photocatalyst were significantly higher compared to SA-PDI, and it displayed efficient killing and inactivation of antibiotic resistant bacteria and genes.
Herein, a plasmonic Z-scheme Ag@AgCl/PDI photocatalyst was successfully synthesized by an in-situ deposition-photoreduction method. The loading of Ag@AgCl nanoparticles could improve the light absorption ability of self -assembled perylene diimide (SA-PDI) via the SPR effect. Ag nanoparticles as electron traps could effectively capture photogenerated electrons on the conduction band of SA-PDI, while the Schottky barrier formed by Ag0 could promote SPR-excited electrons to transfer from Ag to AgCl, further accelerating the charge separation. Besides, more reactive species (center dot O2- , 1O2, h+ and center dot OH) could be produced to enhance the oxidation capacity of composite. Therefore, compared with SA-PDI, Ag@AgCl/PDI exhibited more remarkable visible-light photo -catalytic performance for the elimination of organic pollutants, antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs). The degradation rates of optimum Ag@AgCl/PDI-3% towards phenol, bisphenol A, sulfadimethoxine and ofloxacin were approximately 5.7, 4.0, 3.2 and 10.0 times higher than those of SA-PDI, respectively. Meanwhile, Ag@AgCl/PDI-3% killed all sulfonamide ARB within 2 h and inactived 99.6% of sul-fonamide ARGs (sul1) within 8 h, while SA-PDI only removed 49.4% of ARB and 49.9% of sul1. This study could provide a new strategy to design high-efficiency PDI-based photocatalysts for environmental remediation.
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