研究目的
Investigating the influence of the anodization time on the physicochemical and photoelectrochemical properties of titanium oxide nanotubes (TNTs) and their photocatalytic activity in the degradation of methylene blue.
研究成果
The study demonstrated that the anodization time significantly affects the morphological, structural, surface-chemical, and opto-electronic properties of TNTs, which in turn influence their photocatalytic activity. Longer anodization times resulted in longer nanotubes with higher fluorine content and improved photocatalytic performance in the degradation of methylene blue.
研究不足
The study focuses on the influence of anodization time on TNT properties and photocatalytic activity, but other parameters such as electrolyte composition, voltage, and annealing conditions could also significantly affect the results. The photocatalytic activity was assessed in a continuous-flow regime, which may not fully represent real-world applications.
1：Experimental Design and Method Selection:
TNTs were fabricated by electrochemical anodic oxidation of Ti foils in an ethylene glycol-based solution with NH4F and water. The anodization times used were
2：5, 1, 2, and 4 h with a voltage step of 60 V. After anodization, samples were annealed in air at 450 °C for 2 h. Sample Selection and Data Sources:
Ti foils (99% purity,
3：127 mm, Alfa-Aesar) were used as the starting material. List of Experimental Equipment and Materials:
SEM (JEOL, model JSM-6510LV) for morphology, X-ray diffractometer (Bruker AXS, model D8 Advance) for crystallinity, Raman spectrometer (Thermo Nicolet, model DXR) for phase composition, XPS (Thermo Scientific, model K-Alpha +) for surface chemistry, and a SP-300 Bio-logic potentiostat for electrochemical measurements.
4：Experimental Procedures and Operational Workflow:
The electrochemical and photo-electrochemical characterizations were performed in a three-electrode cell with a quartz window. The photocatalytic activity was assessed by measuring the degradation of methylene blue under UV irradiation.
5：Data Analysis Methods:
The data were analyzed using various techniques including SEM, XRD, Raman spectroscopy, XPS, and electrochemical measurements to evaluate the properties and photocatalytic activity of the TNTs.
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