Strengthening effect of amino and nitro groups on aluminum elemental organic framework and adsorption of bisphenol A in aqueous solution

Abstract Abstract In recent years, there have been many applications of MOFs materials for adsorption. Researchers synthesize new MOFs materials by various methods, including the introduction of functional groups. In this study, three different groups of Aluminum-based MOFs (non-functionalized, amino functionalized and nitro functionalized) were synthesized by hydrothermal synthesis and used for typical EDCs, namely BPA adsorption. We use a variety of characterization methods to characterize it and batch adsorption experiments to investigate its adsorption properties, so as to explore the influence of different functional groups on the adsorption materials. The specific surface area of Al-MOF-NH 2 is 6 times larger than that of Al-MOF according to the N 2 adsorption and desorption isotherms of the material, that is, the BET of Al-MOF, Al-MOF-NH 2 and Al-MOF-NO 2 were 109.68 m 2 /g, 644.03 m 2 /g and 146.60 m 2 /g. It is worth noting that although the same synthesis method is used, the types of pore size are greatly changed due to the different functional groups. Al-MOF and Al-MOF-NO 2 have more mesopores, while Al-MOF-NH 2 is mainly microporous. At the same time, the adsorption capacity of Al-MOF, Al-MOF-NH 2 and Al-MOF-NO 2 on BPA was 46.43 mg/L, 227.78 mg/L and 155.84 mg/L, it can also be explained that the addition of amino functional groups makes Al-MOFs have better adsorption performance. In this study, the adsorption isotherms and adsorption kinetics of the three Al-MOFs materials for BPA were also studied to explain the different adsorption properties of different functional groups. The results show that the amino-functionalized materials have the pretty good characterization morphology, uniform particle distribution, appropriate particle size, the excellent specific surface area, and the better adsorption effect.