Enhanced removal of phosphate from water by fabricating a novel dual metal MIL-101(Fe/Zr)
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Abstract:
Metal-based compounds are promising adsorbents for phosphate.A novel dual metal-organic framework as an effective adsorbent for phosphate was synthesized by a solvothermal method.The structure analysis revealed that the as-prepared adsorbent (denoted as MIL-101(Fe/Zr)) possessed a porous polyhedral structure with a large specific surface area of 479.1 m2/g and a pore width of 3.4 nm.The X-ray diffraction pattern and Fourier transform infrared spectra suggested that the MIL-101(Fe/Zr) shared a similar structure with MIL-101(Fe),implying successful incorporation of Zr atoms as a second metal into the MIL-101(Fe) structure.Kinetic adsorption of PO43—by MIL-101(Fe/Zr) conformed to the pseudo-second-order model and intraparticle diffusion model,while adsorption isotherm fitted the Freundlich model well (R2=0.978 5).It is suggested that such an adsorption belonged to multiply-layer adsorption.The adsorption capacity of MIL-101(Fe/Zr) was to be 66.00 mg/g.MIL-101(Fe/Zr) performed well at a wide range of pH 2.0~10.0 and high ionic strength (0~40 mg/L NaCl).A structural analysis indicated that the complexation interaction was mainly responsible for PO43—adsorption.These findings can inspire preparation of other dual metal MOFs adsorbent for phosphate removal and recovery from water.
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