Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi, 19, 20133, Milano, Italy.
Settore Laboratori, ARPA Lombardia, via Rosellini, 17, 20124, Milano, Italy.
J Hazard Mater. 2018 Feb 15;344:308-315. doi: 10.1016/j.jhazmat.2017.10.012. Epub 2017 Oct 12.
Polyaniline (PANI)-based materials for both removal and sampling of volatile organic compounds (VOCs) from air by rapid adsorption/desorption processes have been developed. The polymer was synthesized in form of emeraldine as both salt and base using different synthetic approaches, a traditional one and a "green" one. VOCs adsorption/desorption efficiency was evaluated for all the materials analyzing the desorbed VOCs fractions by GC/MS technique and obtaining results similar to the presently adopted method employing commercial activated carbon. Most important, in this work it has been demonstrated for the first time that the use of PANI-based sorbents allowed the substitution of the toxic CS, recommended in official methods, with the less hazardous CHOH as the VOCs extraction solvent. Moreover, a complete regeneration of the polymers could be realized by a few rapid washing steps. Finally, the best PANI-based material was subjected to recycling tests thereby showing a high adsorption/desorption efficiency retention up to four runs.
已开发出基于聚苯胺 (PANI) 的材料，用于通过快速吸附/解吸过程从空气中去除和采样挥发性有机化合物 (VOCs)。该聚合物以 emeraldine 盐和碱的形式通过不同的合成方法合成，一种是传统方法，另一种是“绿色”方法。通过 GC/MS 技术分析解吸的 VOC 馏分，评估了所有材料的 VOCs 吸附/解吸效率，并获得了与目前采用商业活性炭的方法相似的结果。最重要的是，在这项工作中，首次证明了使用基于 PANI 的吸附剂可以用毒性较小的 CHOH 代替官方方法中推荐的有毒 CS 作为 VOCs 提取溶剂。此外，通过几次快速洗涤步骤可以实现聚合物的完全再生。最后，对最佳的基于 PANI 的材料进行了回收测试，从而显示出高达四回合的高吸附/解吸效率保持率。
