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. 2015 Jul 7:5:11849.
doi: 10.1038/srep11849.

Synthesis of magnetic metal-organic framework (MOF) for efficient removal of organic dyes from water

Xiaoli Zhao  1 , Shuangliu Liu  2 , Zhi Tang  1 , Hongyun Niu  3 , Yaqi Cai  3 , Wei Meng  1 , Fengchang Wu  1 , John P Giesy  4
Affiliations

Synthesis of magnetic metal-organic framework (MOF) for efficient removal of organic dyes from water

Xiaoli Zhao et al. Sci Rep. .

Abstract

A novel, simple and efficient strategy for fabricating a magnetic metal-organic framework (MOF) as sorbent to remove organic compounds from simulated water samples is presented and tested for removal of methylene blue (MB) as an example. The novel adsorbents combine advantages of MOFs and magnetic nanoparticles and possess large capacity, low cost, rapid removal and easy separation of the solid phase, which makes it an excellent sorbent for treatment of wastewaters. The resulting magnetic MOFs composites (also known as MFCs) have large surface areas (79.52 m(2) g(-1)), excellent magnetic response (14.89 emu g(-1)), and large mesopore volume (0.09 cm(3) g(-1)), as well as good chemical inertness and mechanical stability. Adsorption was not drastically affected by pH, suggesting π-π stacking interaction and/or hydrophobic interactions between MB and MFCs. Kinetic parameters followed pseudo-second-order kinetics and adsorption was described by the Freundlich isotherm. Adsorption capacity was 84 mg MB g(-1) at an initial MB concentration of 30 mg L(-1), which increased to 245 mg g(-1) when the initial MB concentration was 300 mg L(-1). This capacity was much greater than most other adsorbents reported in the literature. In addition, MFC adsorbents possess excellent reusability, being effective after at least five consecutive cycles.

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Figures

Figure 1
Figure 1. Synthesis of Fe3O4/Cu3(BTC)2 magnetic materials.
Figure 2
Figure 2. The structure and morphology of Fe3O4, Cu3(BTC)2 and Fe3O4/Cu3(BTC)2 nanocomposites.
(a) TEM images. (b) XRD patterns. (c) FTIR spectra. (d) VSM curve. (e) Thermo gravimetric analysis (TGA) curve of Fe3O4/Cu3(BTC)2 under air atmosphere.
Figure 3
Figure 3
XPS spectra of (a) Cu2p region and (b) O1s region of the synthesized Fe3O4/Cu3(BTC)2.
Figure 4
Figure 4. Nitrogen adsorption-desorption isotherm of Fe3O4/Cu3(BTC)2 (inset is the pore size distribution of Fe3O4/Cu3(BTC)2).
Figure 5
Figure 5
Mechanism of adsorption of MB on Fe3O4/Cu3(BTC)2 (a) Effect of pH on MB adsorption. (b) Effect of reaction time (the right one describes the pseudo-second-order kinetic) on MB removal. (c) Effect of solution temperature on MB removal. (d) Recyclability of Fe3O4/Cu3(BTC)2 for removing MB from aqueous solution.
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