紫外驱动高级氧化法降解水体中的磷酸三苯酯

有机磷酸酯（OPEs）作为备受关注的一类新污染物，已对偏远的南极地区水环境引发了中等风险.磷酸三苯酯（TPHP）是水体中常见的OPEs，已被证实具有毒性效应、生物富集和放大效应，对环境和人体健康威胁较大.利用傅里叶红外光谱仪（FT-IR）和液相色谱-串联质谱联用仪（LC-MS/MS）探究TPHP在紫外-过氧化氢（UV-H₂ O₂）、紫外-二氧化钛（UV-TiO₂）和紫外-过硫酸盐（UV-PS）这3种高级氧化体系（UV-AOPs）中的降解过程，创新性地利用FT-IR实现了TPHP降解过程中红外特征峰变化的在线观测，并对其降解反应动力学、光降解产物和降解路径进行了分析.结果表明，TPHP在UV-H₂ O₂、UV-TiO₂和UV-PS体系下均能得到有效降解，其光降解半衰期分别为74、150和89 min.其中，UV-H₂ O₂体系对TPHP的降解效果最好.TPHP在3种体系下的降解反应均符合一级动力学.当H₂ O₂浓度为0~0.097 mol ·L^-1时，H₂ O₂浓度升高会促进TPHP降解；当TiO₂浓度为0~0.013 mol ·L^-1时，TiO₂浓度升高会促进TPHP降解.TPHP的光降解路径主要是P—O—C键断裂、苯环结构的C—H键断裂和水解反应.利用UV-H₂ O₂体系对成都市环境水体中OPEs进行降解实验，发现对公园景观水体的水样进行降解反应60 min时，TPHP的去除率为66%.

Degradation of Triphenyl Phosphate in Water by UV-driven Advanced Oxidation Processes

As a type of emerging pollutant of concern, organophosphate esters (OPEs) have posed a moderate risk to the remote Antarctic waters. Triphenyl phosphate (TPHP) is a common type of OPEs in water, which has been proven to have toxic effects, bioaccumulation, and amplification effects and pose a great threat to the environment and human health. Fourier transform infrared spectroscopy (FT-IR) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) were used to investigate the degradation process of TPHP in three advanced oxidation processes (UV-AOPs), including ultraviolet-hydrogen peroxide (UV-H₂O₂), ultraviolet-titanium dioxide (UV-TiO₂), and ultraviolet-persulfate (UV-PS) systems. This was the first instance of using FT-IR for the online observation of the change in infrared characteristic peaks in the degradation process of TPHP, and its degradation reaction kinetics, photodegradation products, and degradation pathways were analyzed. The results showed that TPHP could be effectively degraded under UV-H₂O₂, UV-TiO₂, and UV-PS systems, and the photodegradation half-lives were 74, 150, and 89 min, respectively. The UV-H₂O₂ system had the best degradation effect on TPHP. Additionally, the degradation reactions of TPHP in three systems conformed to the first-order kinetics. When the concentration of H₂O₂ was 0-0.097 mol·L^-1, the increase in H₂O₂ concentration promoted the degradation of TPHP, and when the concentration of TiO₂ was 0-0.013 mol·L^-1, the increase in TiO₂ concentration promoted the degradation of TPHP. The photodegradation pathway of TPHP mainly included the P-O-C bond breaking, the C-H bond cleavage of the benzene ring structure and the hydrolysis reaction of TPHP. The UV-H₂O₂ system was used to degrade OPEs in the environmental water of Chengdu, and it was found that the removal rate of TPHP was 66% when the water samples of the park landscape water were degraded for 60 min.