The photolysis of the antimicrobial triclocarban (TCC) in aqueous systems under simulated sunlight irradiation was studied. The effects of several abiotic parameters, including solution pH, initial TCC concentration, presence of natural organic matter, and most common inorganic anions in surface waters, were investigated. The results show that the photolysis of TCC followed pseudo-first-order kinetics. The TCC photolysis rate constant increased with increasing solution pH and decreasing the initial TCC concentration. Compared with the TCC photolysis in pure water, the presence of aqueous bicarbonate, nitrate, humic acids, and its sodium salt decreased the TCC photolysis rate, but fulvic acid increased the TCC photolysis rate. The electron spin resonance and reactive oxygen species scavenging experiments indicated that TCC may undergo two different types of phototransformation reactions: direct photolysis and energy transfer to generate (1)O2. The main degradation products were tentatively identified by gas chromatography interfaced with mass spectrometry (GC-MS), and a possible degradation pathway was also proposed.

译文

研究了在模拟阳光照射下水性体系中抗菌三氯卡班 (TCC) 的光解。研究了一些非生物参数的影响,包括溶液pH,初始TCC浓度,天然有机物的存在以及地表水中最常见的无机阴离子。结果表明,TCC的光解遵循伪一级动力学。TCC光解速率常数随溶液ph值的增加和初始TCC浓度的降低而增加。与纯水中的TCC光解相比,碳酸氢盐,硝酸盐,腐殖酸及其钠盐的存在降低了TCC光解速率,但黄腐酸增加了TCC光解速率。电子自旋共振和活性氧清除实验表明,TCC可能经历两种不同类型的光转化反应: 直接光解和能量转移以生成 (1) o2。通过气相色谱与质谱联用 (gc-ms) 初步鉴定了主要的降解产物,并提出了可能的降解途径。

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