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Establishing a new hot electrons transfer channel by ion doping in plasmonic metal/semiconductor photocatalyst
摘要： A straightforward strategy is developed to improve the injection efficiency of hot electrons in Ag/TiO2 plasmonic photocatalyst by introducing the Fe dopant. The Fe dopant energy level formed within the bandgap of TiO2 provides an extra electron transfer channel for transferring the hot electrons induced by plasmonic Ag nanoparticles.
关键词： hot electrons,plasmonic photocatalyst,Ag nanoparticles,TiO2,Fe dopant
更新于2025-09-23 15:21:01
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Construction of 1D Ag-AgBr/AlOOH Plasmonic Photocatalyst for Degradation of Tetracycline Hydrochloride
摘要： In this work, the highly ef?cient and low-cost Ag-AgBr/AlOOH plasmonic photocatalyst is successfully prepared via a simple and mild wet-chemical process and used for degrading high concentration methylene blue (MB) and tetracycline hydrochloride (TCH). The optimized 6-Ag-AgBr/AlOOH sample showed a 79% decomposition of TCH in 2 h, which is almost two times higher than that of bare AgBr (37%). For degrading MB, the photocatalytic activity of 6-Ag-AgBr/AlOOH (decomposing 84% in 2 h) showed a large enhancement as compared to bare AgBr (only 57%). The TEM, HRTEM, XRD, DRS, and XPS characterization results con?rm that Ag-AgBr is a composite catalyst formed by loading Ag nanoparticles onto AgBr surfaces and then loaded on to AlOOH. The possible mechanism proposed is that ?O?2 and ?OH radicals produced under sun light are the main active species for degrading MB and TCH. It is hoped that this work will open a new gateway to the synthesis of highly ef?cient and low-cost Ag-AgBr/AlOOH plasmonic photocatalysts for degrading organic pollutants.
关键词： tetracycline hydrochloride,degradation,Ag-AgBr/AlOOH,plasmonic photocatalyst,methylene blue
更新于2025-09-19 17:13:59
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In-situ Homodispersely Immobilization of Ag@AgCl on Chloridized g-C3N4 Nanosheets as an Ultrastable Plasmonic Photocatalyst
摘要： Despite their impressive plasmonic photocatalytic activity, nanosized silver and silver halides always suffer from serious agglomeration and photocorrosion, thus are severely restricted in the practical wastewater restoration applications. The design and realization of plasmonic heterojunction nanostructures is an effective way to solve this stability problem, yet the ideal plasmonic catalyst dispersion and immobilization remains a great challenge. In this work, a highly immobilized Ag@AgCl/g-C3N4 plasmonic photocatalyst was developed through a rational in-situ implanting approach, in which the Ag can be homodispersely distributed and strongly coupled with prefixed Cl sites on g-C3N4 nanosheets (CNNS). The X-ray diffraction (XRD) pattern, X-ray photoelectron spectroscopy (XPS) spectra and element mapping images clearly proved the homodispersely distribution of nanosized Ag@AgCl on the CNNS. The optimal Ag@AgCl-3/CNNS plasmonic photocatalyst with a narrow band gap of 2.45 eV and large specific surface area of 52.9 m2/g performs well in model pharmaceutical wastewater bleaching reactions under visible light. More importantly, the Ag@AgCl-3/CNNS show good stability compared with the conventional inhomogeneously coupled AgCl/g-C3N4 control as verified by their ultralow silver leakage rate in water (0.00152 mg/g·d, accounts 6.9% that of the control) and a much lower corrosion current density (Icorr = 1.63 vs. 3.45 μA), recorded by Tafel slopes. The synergetic effect of surface plasmon resonance effect of nanosized Ag@AgCl with strong visible light harvesting ability and strong coupling between Ag@AgCl and exfoliated porous g-C3N4 nanosheets can support the fast separation of photogenerated electron?hole pairs, thus significantly improving the photocatalytic efficiency in the bleaching of antibiotic pollutants and bacteria. This work affords the great potential of the rational in-situ implanting design for high-performance and stable plasmonic photocatalysts.
关键词： silver leakage control,plasmonic photocatalyst,g-C3N4,Ag@AgCl,ultrastable immobilization
更新于2025-09-19 17:13:59
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Cocatalyst-free Plasmonic H <sub/>2</sub> Production over Au/Ta <sub/>2</sub> O <sub/>5</sub> under Irradiation of Visible Light
摘要： Gold (Au)-modi?ed tantalum(V) oxide (Ta2O5) prepared by using a colloid photodeposition method produced H2 without the aid of a cocatalyst under visible light irradiation due to the su?ciently negative potential of electrons injected from Au nanoparticles into the conduction band of Ta2O5 (10.47 V).
关键词： Pt free,Plasmonic photocatalyst,H2 evolution
更新于2025-09-11 14:15:04
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Fabrication of Ag@AgCl with Enhanced Plasmonic Photocatalysis Performance via a Deep Eutectic Solvent
摘要： The plasmonic photocatalyst Ag@AgCl was successfully prepared through a facile solvothermal method via a deep eutectic solvent (DES), which is composed of choline chloride and urea. X-Ray diffraction, scanning electron microscopy, energy-dispersive X-ray, element-mapping, X-ray photoelectron spectroscopy, N2 absorption–desorption, and UV-vis diffuse reflectance techniques were adopted to analyse the performance of the plasmonic photocatalyst. Characterisation results indicated that the DES not only served as a solvent and Cl source, but also as a reductant. Meanwhile, the probable mechanism for the formation of Ag@AgCl is discussed, which revealed a visible light enhanced photocatalytic property for the degradation of benzidine. Furthermore, the photocatalyst showed no decrease in its catalytic activity even after five cycles of operation. Finally, a possible photocatalytic oxidation mechanism of Ag@AgCl is proposed.
关键词： solvothermal method,photocatalytic degradation,plasmonic photocatalyst,Ag@AgCl,deep eutectic solvent
更新于2025-09-04 15:30:14