Enhancing Cr(VI) reduction and immobilization by magnetic core-shell structured NZVI@MOF derivative hybrids

Fang, Ying; Wen, Jia; Zhang, Haibo; Wang, Qian; Hu, Xiaohong

doi:10.1016/j.envpol.2020.114021

Cited by 89 publications

(25 citation statements)

References 53 publications

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“…A MOF was also reported by Hu et al [138] who enveloped PVP stabilized nZVIs with ZIF-67 MOF that was then carbonized to form nZVI@ZD composite (average diameter, 0.7 µm). This nanocomposite was tested for the removal of Cr(VI) ions from water and was reported to have a maximum adsorption capacity of 226.5 mg•g −1 , far higher than what was observed for the free zerovalent iron and the composite before carbonization.…”

Section: Metallic/metal Oxide/magnetic Nanoparticle-based Nanocompositesmentioning

confidence: 61%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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Water resources are of extreme importance for both human society and the environment. However, human activity has increasingly resulted in the contamination of these resources with a wide range of materials that can prevent their use. Nanomaterials provide a possible means to reduce this contamination, but their removal from water after use may be difficult. The addition of a magnetic character to nanomaterials makes their retrieval after use much easier. The following review comprises a short survey of the most recent reports in this field. It comprises five sections, an introduction into the theme, reports on single magnetic nanoparticles, magnetic nanocomposites containing two of more nanomaterials, magnetic nanocomposites containing material of a biologic origin and finally, observations about the reported research with a view to future developments. This review should provide a snapshot of developments in what is a vibrant and fast-moving area of research.

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Section: Metallic/metal Oxide/magnetic Nanoparticle-based Nanocompositesmentioning

confidence: 61%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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“…So the surface of TMBC can be hydroxylated and Cr (VI) can directly replace the protons as Eqs. (10). On the other hand, the oxygen atoms in the solution can directly complex with Cr (VI) or Cr 6+ (H 2 O) n to reduce the concentration of Cr (VI) (Wang et al 2012).…”

Section: Adsorption Mechanismmentioning

confidence: 99%

“…Cr ( ) can enter human body along with food and water, resulting in mutagenic diseases, such as kidney injury, chronic ulcers, and lung cancer (Zheng et al 2019). The World Health Organization recommended guideline value for total Cr in drinking water is 0.05 mg/L (Fang et al 2020). Therefore, highly effective removal of Cr ( ) from polluted water is necessary for the environmental remediation.…”

Section: Introductionmentioning

confidence: 99%

A Facilely Synthesized Tourmaline-Biochar Composite For Enhanced Removal of Cr (VI) From Aqueous Solution

Lü¹,

Huang²,

Ma³

2021

Preprint

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A tourmaline-biochar composite (TMBC) was facilely synthesized to effectively remove Cr (Ⅵ) from aqueous solution. The effects of different ratio (TM: BC) and pyrolysis temperature on TMBC adsorption performance were compared for optimal condition of TMBC preparation. The TMBC samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) and scanning electron microscope-energy dispersive spectrometer (SEM-EDS). The kinetics and thermodynamics were analyzed to investigate the sorption mechanism for removal of Cr (VI). The results showed that the proper pyrolysis temperature was 650℃, and the ratio of TM and BC was 1:3. SEM results showed that there are many pores in the biochar structure, which is helpful for tourmaline dispersion. The adsorption kinetics was fitted well by the pseudo-second-order model, indicating the sorption is related to chemical absorption. Freundlich adsorption isotherms suggested monolayer adsorption between Cr (Ⅵ) and TMBC, and the maximum adsorption capacity of TMBC for Cr (Ⅵ) was 53.10 mg/g at initial pH 4.0, which is more than twice higher than pristine TM (17.85 mg/g). Such adsorption mechanisms included water automatically polarized, ion exchange and electrode adsorption, among which the automatic polarization of water caused by tourmaline was the unique adsorption property of TMBC. So TMBC composite can be used as an economic adsorbent in the remediation of heavy metal pollution in water.

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“…Therefore, in recent years, magnetic adsorbents have been used to deal with water pollution problems, from the initial use of single magnetite as magnetic adsorbents to the synthesis of various surface modi ed functionalized magnetic nano-adsorbents to e ciently deal with pollutants in wastewater. Surface modi cation can not only improve the agglomeration of particles, but also modify the surface of nanomaterials according to the demand, so that the dispersibility, surface activity and compatibility with other materials can be improved, to make it more appropriate for the application [40][41][42][43][44][45][46][47] . In addition to introducing magnetism and surface modi cation, porous structure is also a widely used and effective method to improve the absorption capacity.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to introducing magnetism and surface modi cation, porous structure is also a widely used and effective method to improve the absorption capacity. The magnetic adsorbent is made into a porous structure, which increases the surface area, reduces the diffusion resistance, promotes the transfer of materials, and is bene cial to increase the adsorption capacity and speed up the adsorption [45][46][47][48][49][50][51][52] . Thus, at lower cost and facile synthetic method for the preparation of porous adsorbents with high speci c surface area architectures for highly adsorption performance is still in great demand.…”

Section: Introductionmentioning

confidence: 99%

Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties

Cheng

Song

et al. 2021

Preprint

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Here, a facile solvothermal method coupled with an annealing strategy is developed to synthesize Fe3O4/carbon (Fe3O4@C) magnetic composite microstructures with different morphologies, including flower-like, hollow spheres and egg-like. Owing to the unique multi-porous and hollow structure, the as-prepared hierarchical Fe3O4@C hollow microspheres composite exhibit appealing performance as an absorbent of Cr(VI) ions in aqueous solution, delivering a high capacity of ca.197.2mg/g. Furthermore, the magnetic Fe3O4 ‘‘core’’ in composite hierarchical microstructures makes them easy to separate from aqueous systems by magnetic separation, the layer of carbon effectively prevents agglomerations of magnetic nanoparticles and expands their range of applications. The excellent Cr(VI) ions adsorbent activities of the Fe3O4@C magnetic composite microstructures would have a potential adsorbing material application in environmental purification.

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Enhancing Cr(VI) reduction and immobilization by magnetic core-shell structured NZVI@MOF derivative hybrids

Cited by 89 publications

References 53 publications

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

A Facilely Synthesized Tourmaline-Biochar Composite For Enhanced Removal of Cr (VI) From Aqueous Solution

Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties

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Enhancing Cr(VI) reduction and immobilization by magnetic core-shell structured NZVI@MOF derivative hybrids

Cited by 89 publications

References 53 publications

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

A Facilely Synthesized Tourmaline-Biochar Composite For Enhanced Removal of Cr (VI) From Aqueous Solution

Constructing Carbon-Coated Fe3O4&nbsp;Hierarchical&nbsp;Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal&nbsp;Properties

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Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties