Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Lahore, Pakistan.
Department of Chemical Engineering, Muhammad Nawaz Sharif University of Engineering and Technology, MNS UET, Multan, 60000, Pakistan.
Environ Sci Pollut Res Int. 2021 Jul;28(26):33994-34008. doi: 10.1007/s11356-020-10260-x. Epub 2020 Jul 25.
Betaine-based natural deep eutectic solvents (NADESs), a new class of green solvents, were immobilized into a porous polyvinylidene fluoride (PVDF) support and evaluated for the separation of CO from CO/N and CO/CH mixtures. Two types of NADESs were synthesized by mixing betaine (hydrogen bond acceptor-HBA) with malic acid and tartaric acid (hydrogen bond donors-HBD) respectively. FTIR and Raman spectroscopy were studied to confirm the synthesis and purity of the NADESs. The thermal strength of the NADESs was investigated using thermogravimetric analysis. The gas permeation results of the fabricated NADES-based-supported liquid membranes (NADES-SLMs) showed that the permeability of CO increased from 25.55 to 29.33 Barrer on substitution of hydrogen bond donor from tartaric acid to malic acid. Similarly, the ideal CO/CH selectivity varied from 51.1 to 56.4 as tartaric acid was replaced by malic acid as the HBD. The performance of NADES-SLMs was compared with the competing imidazolium-based-supported ionic liquid membranes, and proved NADES-SLMs as a promising alternative considering their green potential and comparable gas separation performance. The current effort for the exploitation of NADESs into PVDF membranes in this study is expected to open new routes for the efficient separation of CO from the industrial gas mixture.
基于甜菜碱的天然深共晶溶剂（NADESs）是一类新型绿色溶剂，被固定在多孔聚偏二氟乙烯（PVDF）载体中，并用于分离 CO/N 和 CO/CH 混合物中的 CO。通过将甜菜碱（氢键受体-HBA）分别与苹果酸和酒石酸（氢键供体-HBD）混合，合成了两种类型的 NADESs。通过傅里叶变换红外光谱（FTIR）和拉曼光谱对 NADESs 的合成和纯度进行了研究。通过热重分析研究了 NADESs 的热稳定性。所制备的基于 NADES 的支撑液膜（NADES-SLMs）的气体渗透结果表明，在将氢键供体从酒石酸替换为苹果酸时，CO 的渗透率从 25.55 增加到 29.33 Barrer。同样，当用苹果酸代替酒石酸作为 HBD 时，理想的 CO/CH 选择性从 51.1 变化到 56.4。将 NADES-SLMs 的性能与竞争的基于咪唑鎓的支撑离子液体膜进行了比较，并证明 NADES-SLMs 具有很大的应用潜力，因为它们具有绿色特性和相当的气体分离性能。本研究中，将 NADESs 开发到 PVDF 膜中的努力有望为从工业混合气中有效分离 CO 开辟新途径。
