研究目的
To evaluate the photodegradation of fluoxetine (FLX) using different photochemical reactors, specifically comparing UV and UV/MW processes, in terms of efficiency, energy consumption, kinetics, and identification of transformation products.
研究成果
The UV/MW reactor is significantly more efficient than the UV reactor for FLX degradation, with higher degradation rates, lower energy consumption, and effective hydroxyl radical formation. Kinetics are complex due to TPs influence, and further studies on larger scales are needed.
研究不足
The study was conducted at laboratory scale with small volumes; temperature control was a concern in UV/MW reactor beyond 5 min; spectroradiometer could not measure below 230 nm, missing potential 185 nm emission; kinetics may be influenced by transformation products, limiting first-order applicability.
1：Experimental Design and Method Selection:
The study compared UV and UV/MW photolytic reactors for degrading FLX. Methods included spectrophotometry, HPLC, and LC-MS for analysis.
2：Sample Selection and Data Sources:
FLX solutions were prepared at concentrations from
3：0 to 0 mg L-1 in ultrapure water. List of Experimental Equipment and Materials:
Equipment included UV-Vis spectrophotometer, HPLC system, LC-MS/Q-TOF, spectroradiometer, UV reactor with Philips lamps, UV/MW reactor with Hg-MDEL lamp, and CEM MARS 6 microwave system. Materials included FLX standard, coumarin, DMSO, buffers, and solvents.
4：Experimental Procedures and Operational Workflow:
Solutions were irradiated in reactors for specified times, with parameters like pH, initial concentration, and microwave power varied. Samples were analyzed for FLX degradation, TFMP formation, fluoride release, and TPs identification.
5：Data Analysis Methods:
Kinetics were analyzed using pseudo-first-order models, energy consumption calculated, and TPs identified via mass spectrometry.
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UV-Vis Spectrophotometer
Cary 60
Agilent
Used for preliminary analysis of FLX through molecular absorption measurements.
Cary 60 UV-Vis Spectrophotometer
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HPLC System
1220 Infinity LC
Agilent
Used for chromatographic analysis of FLX and transformation products.
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LC-MS/Q-TOF System
6530 Accurate-Mass Quadrupole Time-of-Flight
Agilent
Used for identification of transformation products via mass spectrometry.
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Spectroradiometer
SPR-4002
Luzchem
Used to determine radiation spectra emitted by the photoreactors.
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UV Lamp
TUV 15 W/G15T8
Philips
Used in UV reactor for photolytic degradation.
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UV/MW Reactor Lamp
Hg-MDEL
UMEX GmbH
Used in UV/MW reactor for combined ultraviolet and microwave degradation.
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Microwave System
MARS 6
CEM
Used for microwave-assisted degradation experiments.
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Ultrathermostatic Bath
SL 152/18
SOLAB
Used for temperature control in UV reactor.
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Cooler Fan
FZY8038 MBL
AC FAN
Used for cooling in UV reactor.
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Water Purification System
Milli-Q Plus
Millipore
Used to produce ultrapure water for solutions.
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