Department of Chemistry, The City College of New York , New York, New York 10031 United States.
Langmuir. 2017 Oct 24;33(42):11475-11483. doi: 10.1021/acs.langmuir.7b02047. Epub 2017 Sep 26.
Removal of chemical warfare agent (CWA) surrogates by highly porous carbon textiles was investigated. The carbon cloth was modified by oxidation in a mixture of concentrated sulfuric and nitric acid. This process did not affect textile structural integrity. The surface properties of the modified textiles were investigated, and their capabilities to remove 2-chloroethyl ethyl sulfide (CEES) and diethylsulfide (EES), two mustard gas surrogates, were evaluated. The oxidized carbon textiles have a highly active surface that has the ability to form radical species. This enhances the degradation of the surrogates, and so the detoxification efficiency. The reaction products detected suggest differences in degradation mechanisms which depend on the type of fabric surface features. Thus, the oxidized surfaces eliminate CEES mainly through dehydrohalogenation, while the nonoxidized surfaces act via hydrolysis. Only the oxidized carbon has a surface active enough to react with the less reactive surrogate EES, by cleavage of the C-S bond. The surface functional groups promote not only the radical formation but also contribute to a strong adsorption of the CWA surrogates, which enhance the decomposition of these toxic species.
研究了高多孔碳纺织品对化学战剂（CWA）模拟物的去除作用。通过在浓硫酸和浓硝酸的混合物中氧化，对碳布进行了改性。该过程不影响纺织品的结构完整性。对改性纺织品的表面性能进行了研究，并评估了它们去除 2-氯乙基乙基硫醚（CEES）和二乙基硫醚（EES）这两种芥子气模拟物的能力。氧化后的碳纤维具有高度活跃的表面，能够形成自由基。这增强了模拟物的降解，从而提高了解毒效率。检测到的反应产物表明，降解机制的差异取决于织物表面特征的类型。因此，氧化表面主要通过脱卤化氢作用去除 CEES，而非氧化表面则通过水解作用去除。只有氧化后的碳表面具有足够的活性，可以通过 C-S 键的断裂与反应性较低的模拟物 EES 发生反应。表面官能团不仅促进了自由基的形成，还有助于 CWA 模拟物的强烈吸附，从而增强了这些有毒物质的分解。
