UV degradation kinetics and modeling of pharmaceutical compounds in laboratory grade and surface water via direct and indirect photolysis at 254 nm.
UV degradation kinetics and modeling of pharmaceutical compounds in laboratory grade and surface water via direct and indirect photolysis at 254 nm.
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DOI：
10.1021/es061491b
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发表时间：
2007-01
影响因子：
11.4
通讯作者：
V. Pereira;H. Weinberg;K. Linden;P. Singer
中科院分区：
文献类型：
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作者：
V. Pereira;H. Weinberg;K. Linden;P. Singer
采用低压紫外间歇反应器，研究了实验室级水（LGW）和当地地表水中药物活性化合物（PhACs）的直接光解和间接光解。本研究中选择的phac属于不同的治疗类别，并且已知在环境样本中发生。报道并讨论了在LGW中获得的基本光解和高级氧化工艺参数（如十进摩尔吸收系数、量子产率和降解速率常数）。利用这些参数与入射光子辐照度、溶液深度和溶液吸光度建立了UV和UV/ H202光解模型，并与地表水实验结果进行了比较。该模型较好地预测了紫外光解实验去除率，但低估了紫外/H2O2光解实验结果。利用这些模型讨论了光程长度和H2O2浓度对基于uv的速率常数预测的影响。
Direct and indirect photolysis of pharmaceutically active compounds (PhACs) was investigated in laboratory-grade water (LGW) and a local surface water using a low-pressure ultraviolet batch reactor. The PhACs selected in this study belong to different therapeutic classes and are known to occur in environmental samples. Fundamental photolysis and advanced oxidation process parameters obtained in LGW (such as the decadic molar absorption coefficient, quantum yield, and degradation rate constants) are reported and discussed. These parameters, together with the incident photon irradiance, solution depth, and solution absorbance were used to develop UV and UV/ H202 photolysis models that were compared with experimental results obtained in the surface water. The model predicted the experimental UV photolysis removals well but underestimated the UV/H2O2 photolysis results. These models were used to discuss the effects of optical path length and H2O2 concentration on the UV-based rate constant predictions.