研究目的
To establish a novel photocatalytic system based on microwave electrodeless lamp and immobilized TiO2 for high photocatalytic efficiency and long catalyst life in degrading reactive brilliant red X-3B.
研究成果
The MEL/TiO2/QS system achieved high photocatalytic efficiency comparable to suspended TiO2, with improved UV light transmission and long catalyst life due to microwave-induced regeneration. Kinetic analyses confirmed pseudo-first-order behavior and Langmuir-Hinshelwood model applicability. Mineralization produced CO2, H2O, SO4^2-, and Cl-, but incomplete decomposition of the triazine ring was noted. This system shows promise for low-cost, efficient wastewater treatment applications.
研究不足
The study may have limitations in scalability to industrial applications, potential variability in microwave irradiation, and the specific focus on one dye (X-3B) which might not generalize to other contaminants. Optimization of parameters like pH and dissolved oxygen was not exhaustive.
1：Experimental Design and Method Selection:
The study designed a photocatalytic system using a microwave electrodeless lamp (MEL) as UV source and TiO2 films immobilized on quartz sheets (TiO2/QS). The rationale was to improve UV light transmission and catalyst reusability. Methods included sol-gel preparation of TiO2 films, dip-coating, and calcination.
2：Sample Selection and Data Sources:
Reactive brilliant red X-3B dye was used as a model compound. Quartz sheets (30 mm×15 mm×1 mm) served as supports. Data were collected from laboratory experiments.
3：List of Experimental Equipment and Materials:
Equipment included a domestic microwave oven (Haier Co. Ltd., power 700 W, frequency
4：45 GHz), U-shaped MEL (length 150 mm, external diameter 25 mm), quartz reactor (working volume 2 L), pump (DP-60, Seisun pumps Co. Ltd.), UV-vis spectrophotometer (UV-1201, Beijing Rayleigh Analytical Instrument Corp.), ion chromatograph (ICS-900, Dionex), TOC analyzer (Multi N/C, Jena), pH meter (pp-15pH, Sartorius), dissolved oxygen meter (5100, YSI), and UV-B radiometer (Photoelectric Instrument Factory of Beijing Normal University). Materials included TiO2 sol prepared from Ti(OC4H9)4, C2H5OH, H2O, NH(C2H4OH)2, and X-3B dye. Experimental Procedures and Operational Workflow:
TiO2/QS were prepared by dip-coating quartz sheets in TiO2 sol, drying, and calcining at 500°C. Experiments involved adding X-3B solution to the reactor, irradiating with microwave, bubbling air (
5：5 L/min) for stirring and oxygen supply, maintaining temperature at 40°C, and sampling at intervals. Dark adsorption ensured saturation before runs. Data Analysis Methods:
Dye concentration was measured spectrophotometrically at 538 nm. Kinetics were analyzed using pseudo-first-order and Langmuir-Hinshelwood models. TOC and ion concentrations were analyzed to assess mineralization.
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TOC analyzer
Multi N/C
Jena
Used to measure total organic carbon in the solution.
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microwave oven
700 W, 2.45 GHz
Haier Co. Ltd.
Used to provide microwave irradiation for the photocatalytic reaction.
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microwave electrodeless lamp
U-shaped, length 150 mm, external diameter 25 mm
Served as the UV light source in the photocatalytic system.
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pump
DP-60
Seisun pumps Co. Ltd.
Used for circulating the solution to maintain temperature at 40°C.
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UV-vis spectrophotometer
UV-1201
Beijing Rayleigh Analytical Instrument Corp.
Used to record UV-vis spectra and determine dye concentration.
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ion chromatograph
ICS-900
Dionex
Used to analyze inorganic ions such as SO4^2-, NO3^-, and Cl^-.
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pH meter
pp-15pH
Sartorius
Used to measure the pH value of the solution.
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dissolved oxygen meter
5100
YSI
Used to monitor dissolved oxygen concentration in the solution.
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UV-B radiometer
Photoelectric Instrument Factory of Beijing Normal University
Used to record the intensity of UV light.
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