A Series of Metal-Organic Frameworks for Adsorption of Halogenated Volatile Organic Compounds

Given the urgent demand for removing toxic vapours from the atmosphere, the employment of porous materials for the adsorption of halogenated volatile organic compounds has been of intense interest. In this respect, a series of isostructural metal-organic frameworks (MOFs), M-MOF-184 (M=Mg, Co, Ni, Zn), was solvothermal synthesized and examined on adsorption of 1,2-dichloroethane. Due to the structural features of Lewis acidic sites derived from the infinite metal-oxo unit and basic sites from 2-oxidobenzoate anions, accessibly hexagonal channels with an aperture size of 24 angstrom, and high porosities (BET surface areas>3000 m(2) g(-1)), three M-MOF-184 (M=Mg, Co, Ni) materials revealed the high saturated capacity of 1,2-dichloroethane at room temperature (> 236 cm(3) g(-1)). Notably, the adsorption capacities of three M-MOF-184 (M=Mg, Co, Ni) frameworks for 1,2-dichloroethane outperformed that of the porous materials including activated carbon and representative MOFs. Among this series, Co-MOF-184 showed the largest adsorption saturated capacity of 1,2-dichloroethane (346 cm(3) g(-1) at 298 K) and highly isosteric heat of adsorption (40 kJ mol(-1)). By mean of ATR-FTIR analysis, we determined the surface interactions between 1,2-dichloroethane and the Co-MOF-184 and explore the important effects of the acidity and basicity properties and large pore structure on 1,2-dichloroethane adsorption performance.

Automated summary

A series of metal-organic frameworks (MOFs) were synthesized and examined for their adsorption performance of 1,2-dichloroethane. The results showed that three MOFs (Mg, Co, Ni) exhibited high saturated capacities and outperformed other porous materials. Co-MOF-184 demonstrated the highest adsorption saturated capacity and isosteric heat of adsorption.