Efficient and Reversible Separation of Chloroform from Chlorinated Hydrocarbons and Water Utilizing a Two-Dimensional Coordination Network

Chloroform is a volatile organic solvent and a contaminant that is slightly soluble in water, making the reversible separation of chloroform from water a critical and challenging task within the chemical and environmental industries. In this study, we present a newly developed coordination framework, [Zn(4-pmntd)(opa)] [4-pmntd, N,N'-bis(4-pyridylmethyl)naphthalene diimide; opa, o-phthalic acid], which demonstrates a high adsorption capacity for chloroform (2.5 mmol/g) and an excellent ability to separate chloroform from water. The effectiveness of chloroform extraction by Zn(4-pmntd)(opa) was confirmed through vapor sorption, grand canonical Monte Carlo simulation, and H-1 nuclear magnetic resonance spectroscopy. The porous framework was also utilized to create a filtration film using natural rubber, which successfully separated chloroform from water with a minimum test concentration of approximately 1 x 10(-6) mol/L and a chloroform purity of 99.2%. [Zn(4-pmntd)(opa)] therefore has significant potential for low-energy separation and recycling of chloroform from water under ambient conditions.

Automated summary

In this study, a newly developed coordination framework [Zn(4-pmntd)(opa)] is presented, which shows a high adsorption capacity for chloroform and an excellent ability to separate chloroform from water. The effectiveness of chloroform extraction by [Zn(4-pmntd)(opa)] was confirmed through various methods. A filtration film created using natural rubber successfully separated chloroform from water with high purity. Therefore, [Zn(4-pmntd)(opa)] has significant potential for low-energy separation and recycling of chloroform from water under ambient conditions.