研究目的
Investigating the influence of ionic liquid types, modification amount, reactant concentration, and pH value on the photocatalytic activity of ionic liquid-modified TiO2 under visible light.
研究成果
Ionic liquid modification, particularly with [Bmim]OH, enhances the visible light absorption and photocatalytic activity of TiO2 without altering its crystalline structure, with optimal conditions identified for modification amount, reactant concentration, and pH value.
研究不足
The study is limited to specific ionic liquids and conditions; potential limitations include the scalability of the hydrothermal method, stability of the modified catalysts over time, and applicability to other pollutants beyond methylene blue.
1：Experimental Design and Method Selection:
The study employed a hydrothermal method to synthesize ionic liquid-modified TiO2 nanocomposites, with characterization using XRD and UV-visible spectroscopy, and photocatalytic performance evaluation under visible light irradiation using methylene blue as a model pollutant.
2：Sample Selection and Data Sources:
Samples included neat TiO2 and TiO2 modified with different ionic liquids ([Bmim]OH, [Bmim]Br, [Bmim]BF4) at various molar ratios, prepared from titanium(IV) chloride and ionic liquids in ethanol, with pH adjustment using ammonia.
3：List of Experimental Equipment and Materials:
Equipment included a stainless steel autoclave, Rigaku D/max-2400 XRD instrument, Zetasizer Nano S90 for zeta-potential measurement, Jasco V-550 UV-visible spectrophotometer, ultrasound generator, high-pressure sodium lamp, and centrifuge. Materials included titanium(IV) chloride, ethanol, ionic liquids, ammonia, HCl, NaOH, methylene blue, BaSO4, and NaNO2 solution.
4：Experimental Procedures and Operational Workflow:
Solutions of TiCl4 in ethanol and ionic liquid in ethanol were mixed, ammonia added to adjust pH to 8, stirred, hydrothermally treated at 160°C for 24 h, filtered, washed, dried. Photocatalytic tests involved dispersing catalyst in methylene blue solution, ultrasound treatment, adsorption equilibrium in dark, irradiation with filtered visible light, sampling at intervals, centrifugation, and UV-visible measurement at 665 nm.
5：Data Analysis Methods:
XRD data analyzed for crystalline structure and particle size using Debye-Scherrer equation; UV-visible spectra used to assess light absorption; photocatalytic activity determined by degradation percentage based on absorbance changes.
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