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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.


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XPS spectra of (a) Cu2p region and (b) O1s region of the synthesized Fe3O4/Cu3(BTC)2.
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f3: XPS spectra of (a) Cu2p region and (b) O1s region of the synthesized Fe3O4/Cu3(BTC)2.

Mentions: XPS was employed to investigate the elemental composition of the surface of prepared composites (Fig. 3). In the 2p core level photoelectron spectra for Cu in Fe3O4/Cu3(BTC)2 (Fig. 3A), the peaks observed at 934.14 and 954.27 eV were related to Cu2p3/2 and Cu2p1/2 electrons, respectively. Similar satellite peaks were also observed in CuO, which indicates that Cu in the MOF is in the divalent form27, which is consistent with results of the FT-IR and XRD analyses. The binding energy of O1s core level was observed at 531.1 eV and corresponds to the characteristics of O2+ ions in the crystalline network (Fig. 3B). These results are in good agreement with results reported previously28.


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)

XPS spectra of (a) Cu2p region and (b) O1s region of the synthesized Fe3O4/Cu3(BTC)2.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: XPS spectra of (a) Cu2p region and (b) O1s region of the synthesized Fe3O4/Cu3(BTC)2.
Mentions: XPS was employed to investigate the elemental composition of the surface of prepared composites (Fig. 3). In the 2p core level photoelectron spectra for Cu in Fe3O4/Cu3(BTC)2 (Fig. 3A), the peaks observed at 934.14 and 954.27 eV were related to Cu2p3/2 and Cu2p1/2 electrons, respectively. Similar satellite peaks were also observed in CuO, which indicates that Cu in the MOF is in the divalent form27, which is consistent with results of the FT-IR and XRD analyses. The binding energy of O1s core level was observed at 531.1 eV and corresponds to the characteristics of O2+ ions in the crystalline network (Fig. 3B). These results are in good agreement with results reported previously28.

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