College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China.
Department of Chemical and Environmental Engineering, The University of Nottingham Ningbo China, Ningbo, 315100, China.
Environ Sci Pollut Res Int. 2019 Sep;26(26):26797-26806. doi: 10.1007/s11356-019-05913-5. Epub 2019 Jul 12.
The photolysis of bis(2-ethylhexyl) phthalate (DEHP) under simulated sunlight in the presence of the natural water photoreactive constituents was investigated. The presence of nitrate or ferric ions facilitated the photodegradation of DEHP via oxidation by generation of •OH. The fulvic acids (FAs), at low concentrations, promoted the photolysis of DEHP via energy transfer from the photoreaction-generated FA*. However, the DEHP photolysis was inhibited with high concentrations of FAs since the excess FAs at the surface of solution could act as light screening agents to keep FAs in bulk solution from the light irradiation, further reducing the FA* generation. When low concentrations of FAs and chloride ions coexist, the reactive chloride species Cl• and Cl• could generate via energy transfer from FA* to chloride ions and react with DEHP to enhance its degradation. Furthermore, the direct and •OH-initiated DEHP photodegraded intermediates and end products were identified by HPLC-MS and its corresponding photolysis pathways were proposed.
在模拟太阳光下，研究了邻苯二甲酸二（2-乙基己基）酯（DEHP）在天然水光反应成分存在下的光解作用。硝酸盐或铁离子的存在通过生成•OH 促进了 DEHP 的光降解。低浓度的富里酸（FA）通过光反应生成的 FA的能量转移促进了 DEHP 的光解。然而，高浓度的 FA 抑制了 DEHP 的光解，因为过量的 FA 在溶液表面可以作为光屏蔽剂，使溶液中的 FA 不会受到光的照射，进一步减少 FA的生成。当低浓度的 FA 和氯离子共存时，活性氯物种 Cl•和 Cl•可以通过 FA*向氯离子的能量转移生成，并与 DEHP 反应，增强其降解。此外，通过 HPLC-MS 鉴定了直接和•OH 引发的 DEHP 光降解中间产物和最终产物，并提出了相应的光解途径。
