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

Zhao X, Liu S, Tang Z, Niu H, Cai Y, Meng W, Wu F, Giesy JP - Sci Rep (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.

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.

No MeSH data available.


Related in: MedlinePlus

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.
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f2: 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.

Mentions: The structure and morphology of the Fe3O4/Cu3(BTC)2 was characterized and is described here. TEM images showed that Fe3O4 NPs were mono-dispersed, spherical with an approximate diameter of 200 nm and Fe3O4 (Fig. 2a) was encapsulated by a shell of Cu3(BTC)2 (Fig. 2b) and these two components of Fe3O4/Cu3(BTC)2 could be clearly identified. The network structure of Cu3(BTC)2 is an octahedron network constructed from dimer Cu paddle wheels linked by BTC19. The Cu2+ ions are connected through a weak bond and the residual axial coordination site is filled by a weakly bound water molecule. The BTC ligand combined these primary building blocks into a 3D octahedron network with an open pore system20.In this study, the functional MAA-Fe3O4 combined with free state Cu2+ ions first and the rate of nucleation by Cu3(BTC)2 could be controlled by the speed at which the organic ligand was added.


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

Zhao X, Liu S, Tang Z, Niu H, Cai Y, Meng W, Wu F, Giesy JP - Sci Rep (2015)

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.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493573&req=5

f2: 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.
Mentions: The structure and morphology of the Fe3O4/Cu3(BTC)2 was characterized and is described here. TEM images showed that Fe3O4 NPs were mono-dispersed, spherical with an approximate diameter of 200 nm and Fe3O4 (Fig. 2a) was encapsulated by a shell of Cu3(BTC)2 (Fig. 2b) and these two components of Fe3O4/Cu3(BTC)2 could be clearly identified. The network structure of Cu3(BTC)2 is an octahedron network constructed from dimer Cu paddle wheels linked by BTC19. The Cu2+ ions are connected through a weak bond and the residual axial coordination site is filled by a weakly bound water molecule. The BTC ligand combined these primary building blocks into a 3D octahedron network with an open pore system20.In this study, the functional MAA-Fe3O4 combined with free state Cu2+ ions first and the rate of nucleation by Cu3(BTC)2 could be controlled by the speed at which the organic ligand was added.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.

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.

No MeSH data available.


Related in: MedlinePlus