研究目的
To compare the degradation of acetaminophen (AAP) in UV-LED-based advanced oxidation processes (AOPs) including UV-LED/chloramine (UV-LED/NH2Cl), UV-LED/hydrogen peroxide (UV-LED/H2O2), and UV-LED/persulfate (UV-LED/PS), and to evaluate the efficiency, mechanisms, and toxicity of these processes.
研究成果
The UV-LED/PS process was the most efficient for AAP degradation among the three UV-LED-based AOPs. It effectively reduced the acute toxicity of the reacted solution. The study provides insights into the mechanisms and optimization of UV-LED-based AOPs for micropollutant removal.
研究不足
The study was conducted under controlled laboratory conditions, which may not fully represent real-world scenarios. The effects of complex water matrices and long-term performance of UV-LED-based AOPs were not extensively explored.
1：Experimental Design and Method Selection
The study compared AAP degradation using UV-LED/NH2Cl, UV-LED/PS, and UV-LED/H2O2 processes. The experiments were conducted in a 500 mL cylindrical beaker reactor with UV-LED irradiation. The degradation kinetics, contributions of reactive species, effects of various factors (oxidant dosage, pH, NOM, and anions), and toxicity changes were evaluated.
2：Sample Selection and Data Sources
AAP solution was prepared with ultrapure water. The concentration of AAP was measured by HPLC. Intermediate products were identified by LC/MS and GC/MS.
3：List of Experimental Equipment and Materials
UV-LED module (278 nm), HPLC (Shimadzu), UPLC system (Waters Acquity), GC/MS (Shimadzu), DR2800 portable spectrophotometer (Hach-Lange), BioFix?Lumi luminescent bacterium.
4：Experimental Procedures and Operational Workflow
Freshly prepared oxidant was introduced to AAP solution, and UV-LED lamps were turned on to start the reaction. Samples were withdrawn at specific times and quenched with Na2S2O3. The temperature was maintained at 25 ± 1 °C.
5：Data Analysis Methods
The degradation followed pseudo-first-order kinetics. The contributions of reactive species were determined using competitive kinetics. Toxicity was assessed using luminescent bacterium.
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