研究目的
To enhance the visible-light-driven photocatalytic activity of ZnO through the incorporation of carbon quantum dots (CQDs) and halloysite nanotubes (HNTs) for the degradation of tetracycline (TC).
研究成果
The incorporation of CQDs and HNTs into ZnO significantly enhanced its visible-light-driven photocatalytic activity for the degradation of tetracycline. The CQDs not only acted as electron reservoirs to hinder recombination but also facilitated the generation of reactive oxygen species (ROS), particularly superoxide radicals (O2?) and singlet oxygen (1O2), under UV–vis light. This work provides a novel strategy for element incorporation with quantum dots and offers insights into band-tuning semiconductors for improved photocatalytic applications.
研究不足
The study acknowledges the challenge of excessive CQDs potentially restricting light absorption and reducing the contact region in the pollutant-photocatalyst system. Additionally, the mechanism of fluorescence of CQDs is not completely understood, which may limit the optimization of their photocatalytic enhancement effects.
1：Experimental Design and Method Selection:
The study involved the synthesis of CQDs modified ZnO hybrid materials via a precipitation-hydrothermal process. The methodology aimed at enhancing the photocatalytic activity under visible light by incorporating CQDs and HNTs to improve dispersity and light absorption.
2：Sample Selection and Data Sources:
Tetracycline (TC) was used as the model pollutant to evaluate the photocatalytic performance. The samples included pure ZnO, ZnO@HNTs, and CQDs/ZnO@HNTs with varying amounts of CQDs.
3：List of Experimental Equipment and Materials:
The synthesis utilized ZnCl2, LiOH·H2O, citric acid monohydrate, ethanediamine, and halloysite nanotubes (HNTs). Characterization was performed using TEM, SEM, HR-TEM, EDX elemental mapping, XRD, UV–vis DRS, XPS, FT-IR, PL spectra, and ESR.
4：Experimental Procedures and Operational Workflow:
The process included the preparation of ZnO and ZnO@HNTs via chemical precipitation, synthesis of CQDs using a microwave method, and hydrothermal synthesis of CQDs/ZnO and CQDs/ZnO@HNTs. Photocatalytic activity was tested under visible light irradiation using a 500 W Xenon lamp.
5：Data Analysis Methods:
The photocatalytic performance was evaluated by measuring the degradation efficiency of TC using UV–vis spectroscopy. The kinetics of the reaction were analyzed, and the active species involved in the photocatalytic process were identified through trapping experiments and ESR analysis.
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