Abstract
The issue of water pollution has emerged as a formidable challenge, prompting a pressing need for solutions. The utilization of metal nanoparticles with surface plasmon resonance and semiconductor composite photocatalysts is regarded as a highly effective approach to solve this problem. g-C3N4 is an effective catalyst for the degradation of organic pollutants. Its photocatalytic performance is usually enhanced by the use of the noble metal Au Ag. However, the high cost of these materials limits their application. In this study, we present the synthesis of Al NPs/g-C3N4 nanocomposites using the bridging effect of ligands. The characterized of transmission electron microscopy (TEM), X-ray diffractometer (XRD) and ultraviolet-visible spectroscopy (UV-Vis) proved that Al NPs/g-C3N4 with a wider light absorption range were successfully synthesized. The effects of ligands, (glutathione (GSH), glutamic acid (GAG), and cysteine (CYS)), Al diameter (40 to 200 nm) and the ratio of Al to g-C3N4 (1:1 to 5:1) on the photocatalytic degradation of methylene blue (MB) by Al NPs/g-C3N4 were also evaluated. The results showed that the optimum degradation efficiency of Al NPs/g-C3N4 for MB at 5 mg/L reached 100% within 60 min, which was 11 times higher than that of pure g-C3N4. The principal analysis of Al enhancing the photocatalytic performance of g-C3N4 was studied through transient photocurrent spectroscopy (TPC), electrochemical impedance spectroscopy (EIS), and steady-state transient fluorescence spectroscopy (PL). The results confirmed that hot carriers generated by localized surface plasmon resonance (LSPR) of Al nanoparticles increase the carrier concentration. In addition, the Schottky barrier generated by Al and g-C3N4 could also improve the carrier separation rate and increase the carrier lifetime. This work is expected to solve the problem of organic wastewater treatment and lay the foundation for subsequent research on photocatalysis.
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This work is supported by the Developing Project of Science and Technology of Jilin Province (20220101021JC), the Project of Education Department of Jilin Province (JJKH20230794KJ). The National Natural Science Foundation of China (62174015), and the “111” Project of China (D17017).
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All authors contributed to the study conception and design. Material preparation, data sorting and writing-manuscript preparation by Haiyu Li. Conceptualization, funding acquisition, supervision, writing-review and editing by Mingze Xu. Investigation, resources by Tingsong Zhang. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Li, ., Xu, M. & Zhang, T. g-C3N4 modified with non-precious metal Al with LSPR as an efficient visible light catalyst. Environ Sci Pollut Res 31, 16795–16804 (2024). https://doi.org/10.1007/s11356-024-32017-6
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DOI: https://doi.org/10.1007/s11356-024-32017-6