The production of perfluoroalkyl acids (PFAAs) has been phased out over recent decades; however, no significant decline in their environmental concentrations has been observed. This is partly due to the photochemical decomposition of PFAAs precursors (PrePFAAs) which remain in extensive use. The decomposition of PrePFAAs may be accelerated by the light-activated engineered nanomaterials (ENMs) in water. In light of this hypothesis, we investigated the photochemical transformation of three PrePFAAs, which are 8:2 fluorotelomer sulfonic acid (8:2 FTSA), 8:2 fluorotelomer alcohol (8:2 FTOH), and 2-(N-ethylperfluorooctane-1-sulfonamido ethyl] phosphate (SAmPAP), in the presence of six ENMs under simulated sunlight irradiation. The transformation rates of 8:2 FTSA and 8:2 FTOH were increased by 2–6 times when in the presence of six ENMs. However, most of ENMs appeared to inhibit the decomposition of SAmPAP. The transformation rates of PrePFAAs were found to depend on the yield of reactive oxygen species generated by ENMs, but the rates were also related to compound photo-stability, adsorption to surfaces, and photo-shielding effects. The PrePFAAs are transformed to perfluorooctanoic acid (PFOA) or/and perfluorooctane sulfonate (PFOS) with higher toxicity and longer half-life, PFOA or PFOS and a few PFAAs having shorter carbon chain lengths. Higher concentrations of the PFAAs photodegradation products were observed in the presence of most of the ENMs.

近几十年来，全氟烷基酸（PFAAs）的生产已被淘汰。然而，没有观察到它们的环境浓度显着下降。这部分是由于仍然广泛使用的PFAA前体（PrePFAAs）的光化学分解。水中的光活化工程纳米材料（ENM）可能会加速PrePFAA的分解。根据这一假设，我们研究了三种PrePFAA的光化学转化，它们是8：2氟调聚物磺酸（8：2 FTSA），8：2氟调聚物醇（8：2 FTOH）和2-（N-乙基全氟辛烷-在模拟的阳光照射下，在六个ENM存在下的1-磺酰胺基乙基磷酸酯（SAmPAP），当六个ENM存在时，8：2 FTSA和8：2 FTOH的转化率提高了2–6倍。 ，大多数ENM似乎抑制SAmPAP的分解。发现PrePFAA的转化率取决于ENM产生的活性氧的产率，但该速率还与化合物的光稳定性，表面吸附和光屏蔽作用有关。将PrePFAA转化为毒性更高，半衰期更长的全氟辛酸（PFOA）或/和全氟辛烷磺酸（PFOS），PFOA或PFOS以及一些具有较短碳链长度的PFAA。在大多数ENMs存在下，观察到较高浓度的PFAAAs光降解产物。吸附到表面，以及光屏蔽效果。将PrePFAA转化为毒性更高，半衰期更长的全氟辛酸（PFOA）或/和全氟辛烷磺酸（PFOS），PFOA或PFOS以及一些具有较短碳链长度的PFAA。在大多数ENMs存在下，观察到较高浓度的PFAAAs光降解产物。吸附到表面，以及光屏蔽效果。将PrePFAA转化为毒性更高，半衰期更长的全氟辛酸（PFOA）或/和全氟辛烷磺酸（PFOS），PFOA或PFOS以及一些具有较短碳链长度的PFAA。在大多数ENMs存在下，观察到较高浓度的PFAAAs光降解产物。