Department of Environmental Engineering, National Cheng Kung University, Tainan City, 70101, Taiwan.
Department of Environmental Engineering, National Cheng Kung University, Tainan City, 70101, Taiwan.
J Hazard Mater. 2017 Jan 15;322(Pt A):310-317. doi: 10.1016/j.jhazmat.2016.04.050. Epub 2016 Apr 21.
Over the past few years, there has been a strong interest in exploring the potential impact of fullerenes in the environment. Despite that both C and C have been detected in environmental matrices, the research on the impact of higher fullerenes, such as C has been largely missing. This study evaluated and compared the phototransformation of aqueous C and C clusters (nC and nC) and their O production under sunlight and lamp light irradiation (315nm, 360nm and 420nm). The nC and nC samples formed by direct mixing with water adopted a face-centered cubic (FCC) crystal structure. The apparent quantum yields (AQYs) of fullerene phototransformed were relatively constant over the examined wavelengths, while O production AQYs decreased with increased wavelengths. The long-term fate studies with outdoor sunlight indicated that both nC and nC lost considerable organic carbon contents (>80%) in water after ∼8 months of irradiation and that the intermediate photoproducts of nC and nC exhibited a progressively increased level of oxygen-containing functionalities. Overall, the study indicates that nC can be photochemically removed under sunlight conditions and that the photoreactivity of nC based on AQYs is greater than that of nC.
在过去的几年中，人们对探索富勒烯在环境中的潜在影响产生了浓厚的兴趣。尽管 C 和 C 都已在环境基质中被检测到，但对于更高阶富勒烯（如 C）的影响研究却很大程度上被忽视了。本研究评估和比较了水相 C 和 C 团簇（nC 和 nC）在阳光和灯光照射（315nm、360nm 和 420nm）下的光转化及其 O 生成情况。通过与水直接混合形成的 nC 和 nC 样品采用面心立方（FCC）晶体结构。富勒烯光转化的表观量子产率（AQYs）在研究的波长范围内相对稳定，而 O 生成 AQYs 随波长增加而降低。在户外阳光进行的长期命运研究表明，在辐照约 8 个月后，nC 和 nC 在水中都失去了相当大的有机碳含量（>80%），并且 nC 和 nC 的中间光产物表现出逐渐增加的含氧官能团水平。总体而言，该研究表明 nC 可以在阳光条件下被光化学去除，并且基于 AQYs 的 nC 的光反应性大于 nC。
