首页|A bifunctional 3D porous Zn-MOF: Fluorescence recognition of Fe~(3+) and adsorption of congo red/methyl orange dyes in aqueous medium
A bifunctional 3D porous Zn-MOF: Fluorescence recognition of Fe~(3+) and adsorption of congo red/methyl orange dyes in aqueous medium
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NSTL
Fe~(3+) Herein, a bifunctional 3D porous metal-organic framework (Zn-MOF) was synthesized based on the sol-vodiermal reaction of tri(p-carboxyphenyl)phosphane oxide (H3L) and Zn salts, and characterized by powder X-ray diffraction (PXRD), diermogravimetric (TG), Infrared (IR), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET). The results show that Zn-MOF has high stability and its specific surface area and pore size are 102.36 m~2 g~(-1) and 2.94 nm, respectively. Meanwhile, Zn-MOF exhibited excellent adsorption performance for Congo red (CR) and Methyl orange (MO) dyes. The adsorption of CR dyes by Zn-MOF is mainly due to the sedimentation caused by gravity of large molecules formed by hydrogen bonding between-NH2 in CR dye molecules and u3-OK in Zn-MOF, while the adsorption of MO by Zn-MOF is mainly attributed to that the larger pore size of Zn-MOF is conducive to MO dye molecules into die channels of Zn-MOF. At die same time, a series of fluorescence experiments showed diat Zn-MOF can also sensitively recognize Fe~(3+) ion in aqueous medium widi the limit of detection of 0.09716 μM, which is inferior to die previously reported values. Furthermore, the recognition mechanism of Zn-MOF for Fe~(3+) ion is mainly ascribed to the internal filtering effect (IFE) by the characterization of PXRD, UV-vis and fluorescence lifetime.
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