研究目的
To synthesize Ag-doped potassium niobates via hydrothermal reaction and examine their photocatalytic activities for phenol degradation under UV light irradiation.
研究成果
Ag doping was successfully achieved in three potassium niobate structures via hydrothermal synthesis, with Ag incorporated differently in each. The layered- and perovskite-type compounds exhibited photocatalytic activity for phenol degradation under UV light, while the pyrochlore-type did not. The presence of Ag metal on the perovskite surface enhanced activity, but interlayer Ag in the layered compound may inhibit it. Future work should focus on improving photocatalytic efficiency and exploring other applications.
研究不足
The pyrochlore-type compound showed poor photocatalytic activity, and the layered-type compound had reduced activity compared to undoped, possibly due to Ag acting as recombination centers. The study is limited to UV light irradiation and specific synthesis conditions; further optimization and visible light applications could be explored.
1：Experimental Design and Method Selection:
Hydrothermal synthesis was used to prepare three types of Ag-doped potassium niobates with varying KOH/Nb2O5 ratios and temperatures. EXAFS analysis was employed to study the chemical environment of Ag atoms, and photocatalytic activity was assessed by phenol degradation under UV light.
2：Sample Selection and Data Sources:
Starting materials were Nb2O5, KOH, and AgNO3 from Kanto Chemical Co. Ltd. Samples were synthesized under specific hydrothermal conditions.
3：List of Experimental Equipment and Materials:
Autoclave (Teflon-lined), X-ray powder diffractometer (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDX), UV-visible diffuse reflectance spectrometer (JASCO V-550), EXAFS beamline (BL14B2 at SPring-8), Xe lamp (UXR-300DU, Ushio Inc.), high performance liquid chromatograph (JASCO HPLC LC-2000).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Hydrothermal reactions were conducted at specified temperatures and times, followed by filtration, washing, drying, and characterization. Photocatalytic tests involved suspending samples in phenol solution, stirring in dark, irradiating with UV light, and analyzing phenol concentration over time.
5：Data Analysis Methods:
XRD for phase identification, SEM and EDX for morphology and composition, UV-Vis for band gap estimation, EXAFS for Ag environment, HPLC for phenol concentration analysis.
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