State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, P. R. China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, P. R. China.
Sci Rep. 2016 Sep 9;6:32949. doi: 10.1038/srep32949.
Here we describe a unique process that achieves complete defluorination and decomposition of perfluorinated compounds (PFCs) which comprise one of the most recalcitrant and widely distributed classes of toxic pollutant chemicals found in natural environments. Photogenerated hydrated electrons derived from 3-indole-acetic-acid within an organomodified clay induce the reductive defluorination of co-sorbed PFCs. The process proceeds to completion within a few hours under mild reaction conditions. The organomontmorillonite clay promotes the formation of highly reactive hydrated electrons by stabilizing indole radical cations formed upon photolysis, and prevents their deactivation by reaction with protons or oxygen. In the constrained interlayer regions of the clay, hydrated electrons and co-sorbed PFCs are brought in close proximity thereby increasing the probability of reaction. This novel green chemistry provides the basis for in situ and ex situ technologies to treat one of the most troublesome, recalcitrant and ubiquitous classes of environmental contaminants, i.e., PFCs, utilizing innocuous reagents, naturally occurring materials and mild reaction conditions.
在这里，我们描述了一种独特的过程，可以完全去除全氟化合物（PFCs），这些化合物是在自然环境中发现的最顽固和分布最广泛的一类有毒污染物之一。在有机改性粘土中，吲哚乙酸衍生的光生水合电子诱导共吸附的 PFCs 发生还原脱氟反应。在温和的反应条件下，该过程在几个小时内即可完成。有机蒙脱土粘土通过稳定光解形成的吲哚自由基阳离子，促进了高反应性水合电子的形成，并防止它们与质子或氧气反应失活。在粘土的层间受限区域中，水合电子和共吸附的 PFCs 被紧密地结合在一起，从而增加了反应的可能性。这种新颖的绿色化学为原位和异位技术提供了基础，可利用无害试剂、天然材料和温和的反应条件来处理最麻烦、最难降解和最普遍的一类环境污染物，即 PFCs。
