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Removal of arsenic(v) from aqueous solutions using sulfur-doped Fe3O4 nanoparticles.


ABSTRACT: In this study, magnetic sulfur-doped Fe3O4 nanoparticles (Fe3O4:S NPs) were applied as adsorbents for the removal of As(v). Fe3O4:S NPs were fabricated by a two-step route, which included low-temperature mixing and high-temperature sintering. The as-prepared Fe3O4:S NPs could effectively remove As(v) under a wide pH range of 2-10 and presented a high As(v) adsorption capacity of 58.38 mg g-1, which was much better than undoped Fe3O4 nanoparticles (20.24 mg g-1). Adsorption experiments exhibited a pseudo-second-order model of adsorption kinetics and a Langmuir isotherm model of adsorption isotherms. Additionally, the coexisting ions such as NO3 -, SO4 2-, and CO3 2- had no significant effect on As(v) adsorption and the adsorbent worked well in actual smelting wastewater. XPS and FTIR spectra of Fe3O4:S NPs before and after As(v) adsorption showed that Fe-OH groups played a significant role in the adsorption mechanisms. Moreover, the magnetic Fe3O4:S NPs adsorbents after adsorption could be rapidly separated from wastewater with an external magnetic field. Therefore, Fe3O4:S NPs could be an ideal candidate for the removal of As(v) from water.

SUBMITTER: Liu J 

PROVIDER: S-EPMC9091571 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Removal of arsenic(v) from aqueous solutions using sulfur-doped Fe<sub>3</sub>O<sub>4</sub> nanoparticles.

Liu Junhui J   Kong Long L   Huang Xueqiong X   Liu Min M   Li Liang L  

RSC advances 20181205 71


In this study, magnetic sulfur-doped Fe<sub>3</sub>O<sub>4</sub> nanoparticles (Fe<sub>3</sub>O<sub>4</sub>:S NPs) were applied as adsorbents for the removal of As(v). Fe<sub>3</sub>O<sub>4</sub>:S NPs were fabricated by a two-step route, which included low-temperature mixing and high-temperature sintering. The as-prepared Fe<sub>3</sub>O<sub>4</sub>:S NPs could effectively remove As(v) under a wide pH range of 2-10 and presented a high As(v) adsorption capacity of 58.38 mg g<sup>-1</sup>, which  ...[more]

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