2021年6月25日 · Considering the strong photocatalytic property of TiO 2 and large electron exchange capacity of CuO, we speculate that TiO 2 may be more effective in promoting EPFRs formation under UV light irradiation, while CuO be more effective in dark.

2011年8月8日 · Reactive oxygen species (ROS) generated by environmentally persistent free radicals (EPFRs) of 2-monochlorophenol, associated with CuO/silica particles, were detected using the chemical spin trap, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), in conjunction with electron paramagnetic resonance (EPR) spectroscopy.

摘要: 环境持久性自由基 (Environmental Persistent Free Radicals, EPFRs)是一种新型且具有潜在环境风险的物质。 与短寿命自由基相比，其具有较强的环境持久性，可以在介质中长期存在，甚至不消失。 它可以破坏人体的正常细胞，诱发DNA突变，导致肺功能障碍，加快人体衰老速度，提高患病的几率。 同时，含有EPFRs的活性物质还可能对污染物有直接或间接的降解作用。 目前对于EPFRs的研究尚处于起步阶段。

2023年8月15日 · EPFRs (Environmentally Persistent Free Radicals) are a class of pollutants that have been identified as potential environmental contaminants due to their persistence and ability to generate reactive oxygen species (ROS) that can cause oxidative stress in living organisms.

The current study reports the dependency of EPFR yields and their persistency on metal loading in particles (0.25, 0.5, 0.75, 1, 2, and 5% CuO/silica). The EPFRs were generated through exposure of particles to three adsorbate vapors at 230 °C: phenol, 2-monochlorophenol (2-MCP), and dichlorobenzene (DCBz).

2021年6月25日 · Stronger EPFRs were associated with more abundant dimer structures, suggesting the dimer structures were related to EPFRs formation during catechol degradation. Monitoring the generation of dimer structures in the degradation of organic chemicals may provide useful information to estimate EPFRs generation and risks.

Full mechanisms of EPFRs formation over (CuO)1-8, and aluminum oxide clusters were studied. The most stable intermediates and products have been determined and compared to available experimental data.

2021年2月1日 · EPFRs signal up to 1.66 × 10²⁰ spins/g were detected in PM10 of the diesel exhaust. Higher engine speed and lower altitude were associated with stronger EPR signals on PM10.

2021年6月25日 · Both TiO 2 (Patterson et al., 2015) and CuO (Lomnicki et al., 2008) have been reported to promote the generation of EPFRs. Considering the strong photocatalytic property of TiO 2 and large electron exchange capacity of CuO, we speculate that TiO 2 may be more effective in promoting EPFRs formation under UV light irradiation, while CuO be more ...

环境持久性自由基（environmentally persistent free radicals，EPFRs）是一类新的环境污染物，其半衰期可达数月，可在环境样品以及二噁英生成过程中检出. 近年来EPFRs被认为是UPOPs生成的重要自由基中间体.