Montmorillonite-supported magnetite nanoparticles for the removal of hexavalent chromium [Cr(VI)] from aqueous solutions

Yuan, Peng; Fan, Minguang; Yang, Diya; He, Hongping; Liu, Dong; Yuan, Aihua; Zhu, Jianxi; Chen, TianHu

doi:10.1016/j.jhazmat.2008.11.083

Cited by 472 publications

(159 citation statements)

References 60 publications

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“…5, first cycle). The recovery efficiency significantly increases when the particle size decreases to 13.3 mg/g for a NP of 16 nm, which is a relatively high value in comparison with other unsupported systems reported in the literature (Chowdhury et al 2012;Yuan et al 2009). This is because the surface/volume ratio increases, thus augmenting the surface available for adsorption as a result of not only the smaller particle size but also to the dispersibility of the NPs.…”

Section: Effect Of the Nanoparticle Size On The Cr(vi) Recovery And Rmentioning

confidence: 66%

“…The pseudosecond-order kinetic model considers chemisorption to be the rate-limiting step, which occurs at high Cr(VI) concentrations and when the interactions of the ions and the active sites on the surface are effective. Yuan et al (2009) previously studied the adsorption of Cr(VI) on magnetite nanoparticles and also on magnetite nanoparticles supported on montmorillonite, and they concluded that supported nanoparticles present much higher efficiency for the adsorption of Cr(VI). This was attributed to the fact that the magnetite nanoparticles are better dispersed when they are supported, which makes the synthetic approach more complex.…”

Section: Isotherms and Kinetic Adsorptionmentioning

confidence: 99%

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Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

Martínez

Muñoz‐Bonilla

Mazarío

et al. 2015

Int. J. Environ. Sci. Technol.

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Well-dispersed magnetite nanoparticles of different sizes between 15 and 43 nm were synthesized by an electrochemical method in a controlled manner by simply changing the synthesis temperature. These nanoparticles were used as a reusable adsorbent to remove Cr(VI) from aqueous solution. The recovery efficiency was found to be highly dependent on environmental parameters, such as temperature and pH. In addition, it was demonstrated that the initial concentrations of both Cr(VI) and magnetite nanoparticles strongly influence the removal capability of these nanomaterials. Remarkably, the nanoparticle size has a key role on the Cr(VI) adsorption efficiency, which gradually increases as the diameter decreases due to the augmentation of the surface area. The low aggregation in the case of small particles that results from the low magnetization saturation values also contributes to the enhancement of the surface area available for Cr(VI) adsorption. In contrast, nanoparticles with larger sizes are more easily manipulated by a magnet, and the efficiency is largely maintained after five cycles. The adsorption process fits the Langmuir isotherm model well, and the reaction was found to follow a pseudo-second-order rate.

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Section: Effect Of the Nanoparticle Size On The Cr(vi) Recovery And Rmentioning

confidence: 66%

Section: Isotherms and Kinetic Adsorptionmentioning

confidence: 99%

Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

Martínez

Muñoz‐Bonilla

Mazarío

et al. 2015

Int. J. Environ. Sci. Technol.

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“…Magnetite has been applied in the adsorption of various heavy metals, e.g., Cr(VI) [27], Hg(II) [28], As(V) [25], Sb(V) [29], Se(IV) [30] and U(VI) [31]. The adsorption mechanism includes surface site binding [32], electrostatic interaction [33], modified ligand combination [34] and oxidation-reduction interaction [35,36].…”

Section: Introductionmentioning

confidence: 99%

The distinct effects of Mn substitution on the reactivity of magnetite in heterogeneous Fenton reaction and Pb(II) adsorption

Liang

Zhu

Wei

et al. 2014

Journal of Colloid and Interface Science

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“…In aqueous media, FeOH physically on the surface of Fe 3 O 4 NPs by electrostatic attraction forces and then reduced to Cr(III) by redox reactions [35][36][37]. After physical adsorption process, chemical adsorption happens by electron exchange between FeOH + 2 and HCrO 4 ions, and Cr(VI) ions are reduced to non-toxic Cr(III) forms.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Synthesis, Characterization and Cr(VI) Adsorption Properties of Modified Magnetite Nanoparticles

2017

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In this study, magnetite (Fe3O4) nanoparticles were synthesized by chemical co-precipitation method, coated with silica, and then the surface of silica coated magnetite (Fe3O4@SiO2) nanoparticles was modified with (3-aminopropyl)triethoxysilane (APTES) at first. Secondly, attained nanoparticles were characterized by the Fourier transform infrared, X-ray diffraction, transmission electron microscopy, the Brunauer-Emmett-Teller, vibrating sample magnetometer, and zeta-sizer devices/methods. Finally, detailed adsorption experiments were performed to remove hexavalent chromium (Cr(VI)) from aqueous media by synthesized nanoparticles. Mean size and specific surface area of synthesized nanoparticles were about 15 nm and 89.5 m 2 /g, respectively. The highest adsorption capacity among used adsorbents (Fe3O4, Fe3O4@SiO2, Fe3O4@SiO2@L) was attained by Fe3O4 nanoparticles and it was determined that adsorption capacity of the other two adsorbents was too low when compared to the Fe3O4 nanoparticles. Optimum conditions for Cr(VI) adsorption by Fe3O4 nanoparticles were: pH, 3; temperature, 55• C; contact time, 90 min; adsorbent concentration, 0.5 g/l and initial Cr(VI) concentration 10 mg/l. Under these conditions, adsorption capacity and removal percentage of Cr(VI) were found to be 33.45 mg/g and 88%, respectively.

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Montmorillonite-supported magnetite nanoparticles for the removal of hexavalent chromium [Cr(VI)] from aqueous solutions

Cited by 472 publications

References 60 publications

Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

The distinct effects of Mn substitution on the reactivity of magnetite in heterogeneous Fenton reaction and Pb(II) adsorption

Synthesis, Characterization and Cr(VI) Adsorption Properties of Modified Magnetite Nanoparticles

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