研究目的
To assess the effectiveness of pulsed light technology as a UV light source in an advanced oxidation process for the decolourization of azo dyes in wastewater, and to investigate the enhancement of this process with ferrioxalate complex.
研究成果
The PL/H2O2 process effectively decolourizes azo dyes with fast treatment times, and the addition of ferrioxalate enhances degradation rates. No toxic by-products were detected, indicating potential for environmentally friendly wastewater treatment. PL technology offers a rapid, eco-friendly alternative to traditional light sources in AOPs, with possibilities for further optimization using advanced photocatalysts.
研究不足
The study was conducted in a batch reactor with specific dye concentrations and conditions; results may not directly apply to continuous flow systems or real wastewater with complex matrices. The process may be inhibited by certain salts present in industrial effluents. Complete mineralization of dyes was not achieved under the experimental conditions, and the scalability and energy efficiency of PL technology for large-scale applications were not fully addressed.
1：Experimental Design and Method Selection:
The study used a batch reactor setup with pulsed light (PL) technology combined with hydrogen peroxide (H2O2) and ferrioxalate complex for dye degradation. The process was based on UV-based advanced oxidation processes (AOP) generating hydroxyl radicals. Spectrophotometry was used to monitor decolourization, and kinetics were fitted to first-order models.
2：Sample Selection and Data Sources:
Two azo dyes, Congo red and Methyl orange, were used as model pollutants. Solutions were prepared in milli-Q water with specified concentrations of dyes, H2O2, and other chemicals. Samples were withdrawn at intervals during treatment.
3：List of Experimental Equipment and Materials:
A pulsed light system (XeMaticA-Basic-1L, Steribeam), xenon lamp, magnetic stirrer (Topolino, IKA), UV-vis spectrophotometer (UV-1700, Shimadzu), pH meter (Basic 20, CRISON), infrared thermometer (ScanTemp 410, TFA Dostmann), liquid chromatography system (SCIEX ExionLC? AD), mass spectrometer (SCIEX X500R QTOF), and various reagents including dyes, salts, and solvents.
4：Experimental Procedures and Operational Workflow:
Dye solutions were treated with PL pulses in a Petri dish placed below the lamp, with stirring between pulses. Fluence was increased by applying multiple pulses. Parameters varied included dye concentration, H2O2 concentration, pH, and addition of salts or ethanol. For ferrioxalate tests, iron nitrate and sodium oxalate were added in specific ratios, and pH was adjusted. Samples were analyzed for absorbance changes and degradation products.
5：Data Analysis Methods:
Pseudo-first order rate constants were calculated from absorbance vs. fluence data using regression. Data processing was done with Excel 2010. Degradation products were identified using liquid chromatography-mass spectrometry (LC-MS) with high-resolution techniques.
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