Plataforma Solar de Almería (CIEMAT), Tabernas, Almería, Spain.
J Hazard Mater. 2012 May 30;217-218:217-23. doi: 10.1016/j.jhazmat.2012.03.017. Epub 2012 Mar 15.
This study evaluated the formation of chlorinated transformation products during photo-Fenton treatment of pyrimethanil (PYR-20 mg L(-1)) in two water matrices, demineralised water (DW) and water containing 5 g L(-1) of NaCl (DW(NaCl)). All experiments were carried out in compound parabolic collectors (CPC) at an initial Fe(2+) concentration of 5 mg L(-1) and H(2)O(2) concentration of 150-350 mg L(-1). Dissolved Organic Carbon (DOC), High-Performance Liquid Chromatography with Diode-Array Detection (HPLC-DAD), Liquid Chromatography-Time-Of-Flight Mass Spectrometry (LC-TOF-MS), toxicity and biodegradability tests were conducted to control the photocatalytic treatment. In DW, PYR was completely eliminated after 11.8 min of illumination and initial DOC was reduced 50% after 79 min of illumination with 33 mM of H(2)O(2) consumed. On the other hand, in DW(NaCl) water matrix, the same reduction in DOC took 110 min of illumination and H(2)O(2) consumption of 39 mM, and total degradation of PYR was observed at 12 min of illumination. PYR transformation products (TPs) were identified by LC-TOF-MS. It was demonstrated that photo-Fenton in a DW(NaCl) produces some chlorinated TPs in addition to the non-chlorinated TPs identified during degradation in the DW. All TPs formed were eliminated during photo-Fenton. Additionally, the presence of chlorinated TPs does not increase the toxicity of the water, and TPs formed are more biodegradable than PYR.
本研究评价了在两种水基质中，即去离子水（DW）和含有 5 g/L NaCl 的去离子水（DW(NaCl)）中，嘧啶胺（PYR-20 mg/L）在光芬顿处理过程中形成的氯化转化产物。所有实验均在复合抛物面集热器（CPC）中进行，初始 Fe(2+)浓度为 5 mg/L，H(2)O(2)浓度为 150-350 mg/L。采用溶解有机碳（DOC）、高效液相色谱-二极管阵列检测（HPLC-DAD）、液相色谱-飞行时间质谱（LC-TOF-MS）、毒性和生物降解性测试来控制光催化处理。在 DW 中，PYR 在 11.8 分钟的光照下完全消除，初始 DOC 在 79 分钟的光照下降低了 50%，同时消耗了 33 mM 的 H(2)O(2)。另一方面，在 DW(NaCl)水基质中，DOC 的相同减少需要 110 分钟的光照和 39 mM 的 H(2)O(2)消耗，并且在 12 分钟的光照下观察到 PYR 的完全降解。通过 LC-TOF-MS 鉴定了 PYR 转化产物（TPs）。结果表明，光芬顿在 DW(NaCl)中除了在 DW 降解过程中鉴定出的非氯化 TPs 外，还会产生一些氯化 TPs。所有形成的 TPs 在光芬顿处理过程中都被消除。此外，氯化 TPs 的存在不会增加水的毒性，并且形成的 TPs 比 PYR 更具生物降解性。
