Zn-based metal-organic framework for detection and ultra-adsorption of Fe3+ ion and catalytic degradation of methylene blue

Metal-organic frameworks (MOFs) had shown a wide range of application prospects in the removal of pollutants in water because of its designability. In this work, a multifunctional MOF material (S-MOF) had been designed by selecting ligand in advance and introducing specific groups in synthesis process. The S-MOF showed excellent stability. S-MOF could specifically identify Fe3+ ion in water and can selectively remove (442 mg/g) them ultra-efficiently (>99.9 %). Moreover, it can stably identify and remove Fe3+ ion in complex water where many ions exist. It was worth emphasizing that the adsorbed waste (Fe@S-MOF) of S-MOF was also recovered and its properties were studied. Fe@S-MOF exhibited highly efficient catalytic degradation of methylene blue, which could degrade more than 98.7 % of methylene blue, and its pseudo-first-order rate constant was as high as 0.829 min(-1). Moreover, the successful preparation of S-MOF and Fe@S-MOF membrane had also simplified the recovery and expanded its application. In general, not only a multi-functional MOF material with application potential had been obtained, but also its recycling promoted the green and sustainable development of MOFs and broadened the road of MOFs materials in development and application.