构建了紫外活化高碘酸盐(PI, IO4-)的UV/PI体系(UV(10W低压,峰值在254nm),PI (5mmol/L)),并考察了该体系在尿液中降解药物的效能.结果表明,所选的12种药物类污染物(PhACs)在10min的去除率达到60%以上;在此基础上,进一步评估了尿液基质对UV/PI体系降解污染物的影响.在新鲜尿液基质中,尿素和柠檬酸盐可与体系中的自由基反应,进而抑制PhACs的降解,速率常数ki值较UV/PI体系减小了约0.0083~0.0129s-1;而Cl-与自由基反应生成活性更低的活性氯物质(RCS)进而影响降解效率,速率常数ki值减小了约0.0015~0.0056s-1.在水解尿液基质中,尿素和柠檬酸盐被水解为NH3和HCO3-,NH3和HCO3-与自由基反生成活性氮物质(RNS)和CO3·-从而降解PhACs,UV/PI体系对PhACs的降解表现出显著的结构选择性.
Abstract
In this study, the UV activated periodate (PI, IO4-) system (UV/PI) was investigated to degrade PhACs in urine (UV(10W low pressure, peak at 254nm), PI (5mmol/L)), the results demonstrated that the degradation rate of 12 selected Pharmaceutically active compounds (PhACs) exceeded 60% at 10min; based on this, the influence of urine matrix on PhACs degradation was further studied. In fresh urine matrices, urea and citrate reacted with the radicals, inhibiting the degradation of PhACs, with the rate constant ki decreasing by about 0.0083~0.0129s-1 compared to the UV/PI system. Meanwhile, Cl- reacted with the radicals to form lower reactive chlorine species (RCS), which negatively affected the degradation efficiency, with the ki decreasing by about 0.0015~0.0056s-1. In hydrolyzed urine matrices, urea and citrate were hydrolyzed into NH3 and HCO3-. Then, NH3 and HCO3- reacted with the radicals to produce reactive nitrogen species (RNS) and CO3·-, which further reacted with PhACs. UV/PI system exhibited significant structural selectivity for the degradation of PhACs.
关键词
高碘酸盐 /
高级氧化 /
自由基 /
药物类污染物
Key words
periodate /
advanced oxidation /
radicals /
pharmaceutically active compounds
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基金
国家自然科学基金资助项目(52370068)
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