研究目的
To evaluate the efficiency of TiO2 and TiO2 supported on zeolite catalysts for photocatalytic degradation of methyl orange dye and textile wastewater using chemometric methods, specifically MCR-ALS, to resolve intermediates and study kinetics.
研究成果
MCR-ALS effectively resolved intermediates in photocatalytic degradation, showing different pathways based on pH and catalyst. All reactions followed first-order kinetics, with supported catalysts being slower due to adsorption/desorption mechanisms. The method is suitable for real-time monitoring of wastewater treatment.
研究不足
The study is limited to specific catalysts and conditions (pH 3 and 6); real wastewater composition is unknown, affecting absolute concentration measurements; the method may not identify all intermediates compared to more advanced techniques like chromatography-mass spectrometry.
1：Experimental Design and Method Selection:
The study used batch photocatalytic degradation experiments with UV-Vis spectroscopy to monitor reactions. Chemometric methods, particularly MCR-ALS, were applied to resolve intermediates from spectral data.
2：Sample Selection and Data Sources:
Methyl Orange dye (20 mg/L solution) and real textile wastewater from Ethiopia were used. pH was adjusted to 3 or 6 for MO experiments.
3：List of Experimental Equipment and Materials:
Equipment includes a quartz batch reactor, magnetic stirrer, UV lamp (Heraeus medium pressure mercury lamp), Perkin-Elmer Spectrum 65 UV/Vis/NIR spectrophotometer, and MATLAB
4：8 for data analysis. Materials include TiO2 catalyst, TiO2 supported on zeolite catalyst, Methyl Orange dye (BDH Chemicals Limited), H2SO4, NaOH, and oxygen gas. Experimental Procedures and Operational Workflow:
Catalysts were suspended in solutions, stirred for 30 min, irradiated with UV light, samples taken at intervals, centrifuged, and UV-Vis spectra recorded. MCR-ALS was applied to the spectral data matrix.
5：Data Analysis Methods:
MCR-ALS algorithm with non-negativity constraints was used to decompose spectral data into concentration and spectral profiles, and kinetic analysis was performed assuming first-order kinetics.
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