WANGJin-xiao,ZHENGWei-jie,XURong-gang,et al.Performance and Mechanism of UV/SPC System for Degradation of Acetaminophen[J].China Water & Wastewater,2024,40(7):65-72.
Performance and Mechanism of UV/SPC System for Degradation of Acetaminophen
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第7期
Page:
65-72
Column:
Date of publication:
2024-04-01
- Abstract:
- The performance and mechanism of UV-catalyzed sodium percarbonate (SPC) for degrading acetaminophen (APAP) were investigated. The removal rate of APAP reached 100% after 60 min of reaction when the pH, initial APAP concentration and SPC concentration were 7, 10 mol/L and 2 mmol/L, respectively. The free radical quenching experiment and electron spin resonance (ESR) detection showed that the main active substances for degrading APAP in the UV/SPC system were ·OH and CO3·-, and their contribution rates were 61.5% and 38.5%, respectively. The optimization experiment indicated that appropriately increasing the concentration of SPC and decreasing the pH of the reaction could effectively promote the degradation of APAP. However, natural organic matter (NOM) and HCO3- inhibited the degradation of APAP. Thirteen degradation products of APAP were determined by gas chromatography-tandem mass spectrometry (GC-MS/MS). It was speculated that APAP was gradually degraded by the pathways such as electron transfer, hydrogen atom abstraction and substitution reaction. The detection of TOC indicated that the mineralization degree of the UV/SPC system was low, resulting in the accumulation of a large number of intermediate products. The acute toxicity experiments indicated that the toxicity of APAP increased during degradation.
Last Update:
2024-04-01