Li Yingjie, Chang Haiyu, Yan Hui, Tian Senlin, Jessop Philip G
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
School of Pharmacy, Liaocheng University, Liaocheng 252059, China.
ACS Omega. 2020 Dec 30;6(1):253-264. doi: 10.1021/acsomega.0c04443. eCollection 2021 Jan 12.
Absorption is one of the most important treatment technologies for the removal of volatile organic compounds (VOCs) from tail gases, yet the separation of the absorbents and VOCs remains challenging because of concerns related to environmental impact and large energy requirements. Herein, we explored an absorption and desorption process using ,-dimethylcyclohexylamine (CyNMe) as a representative switchable-hydrophilicity solvent (SHS) and toluene as a representative VOC. The results showed that in comparison to common absorbents, CyNMe exhibits excellent toluene absorption performance. Desorption efficiencies of toluene from CyNMe of up to 94% were achieved by bubbling CO at 25 °C, and separation efficiencies of CyNMe from water up to 90% were achieved by bubbling N at 60 °C. Even after five absorption-desorption cycles, the toluene absorption capacity of CyNMe was comparable with that of the fresh absorbent, suggesting that CyNMe retains its absorption capacity. We demonstrate an innovative and reversible remediation strategy of VOCs based on SHSs, and the results indicate that SHSs can be used as an alternative to common absorbents for the removal of VOCs to reduce environmental pollution and energy consumption.
吸收是从尾气中去除挥发性有机化合物（VOCs）的最重要处理技术之一，然而，由于环境影响和高能量需求等问题，吸收剂与VOCs的分离仍然具有挑战性。在此，我们探索了一种以N，N-二甲基环己胺（CyNMe）作为代表性的可切换亲水性溶剂（SHS）、甲苯作为代表性VOC的吸收和解吸过程。结果表明，与普通吸收剂相比，CyNMe表现出优异的甲苯吸收性能。通过在25°C下鼓泡CO₂，甲苯从CyNMe中的解吸效率高达94%，通过在60°C下鼓泡N₂，CyNMe与水的分离效率高达90%。即使经过五个吸收-解吸循环，CyNMe的甲苯吸收能力仍与新鲜吸收剂相当，这表明CyNMe保留了其吸收能力。我们展示了一种基于SHS的创新且可逆的VOCs修复策略，结果表明SHS可作为普通吸收剂的替代品用于去除VOCs，以减少环境污染和能源消耗。
