Synthesis and modification of spherical/hollow metal-organic frameworks for efficient extraction of sulfonamides in aqueous environments

Abstract

In this study, two novel spherical/hollow metal-organic frameworks were successfully synthesized, and further modified by a mild non-covalent modification strategy with dopamine and 1,4-benzenedithiol (BDT) as polymeric monomers to obtain pBDT@PDA-Ni-MOF and pBDT@PDA-Ni/Co-MOF, respectively. The results showed that the above MOFs possessed extremely fast adsorption rates and ideal adsorption capacities for sulfonamides (SAs) and the modified MOFs exhibited enhanced adsorption capacities for SAs owing to a large number of additional functional groups. Then, benefit of their regular morphology and size, a facile syringe-assisted dispersive solid phase extraction (S-DSPE) method was developed for efficient detection of SAs, which will provide a powerful tool for monitoring trace level of SAs in aqueous environment.