Properties and mechanism of hexavalent chromium removal by FeS@ graphite carbon nitride nanocomposites

Su, Junjie; Han, Hao; Lv, Xiaofan; Jin, Xin; Yang, Qi

doi:10.1016/j.colsurfa.2020.124751

Cited by 36 publications

(9 citation statements)

References 67 publications

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“…The fitting result of pseudo‐second‐order model under initial U(VI) concentration of 18.00 and 27.00 mg/L well with higher correlation coefficient value ( R 2 =0.9912 and 0.9975 for concentration of 18.00 and 27.00 mg/L respectively), which were better than that of Elovich, Intra‐particle diffusion, and pseudo‐first‐order model. The fitting data indicated that the chemical interaction involving sharing and exchanging of electrons between metal ions and adsorption site dominated the processes of U(VI) removal by TNTs‐FeS [18] …”

Section: Resultsmentioning

confidence: 99%

“…In addition, FeS nanoparticles have better adsorption performance and stronger reduction ability due to a higher specific surface area with abundant availability of active sites on the surface, and both Fe and S act as electron donors in chemical reduction. However, the agglomeration owing to magnetic attraction and oxidation has restricted the large‐scale application of nano‐FeS materials [18] . To overcome these defects and enhance the stability of FeS nanoparticles, a series of materials were prepared to stabilize FeS nanoparticles to prevent agglomeration and precipitation, containing organic polymers, [19] inorganic nanoparticles, [20] synthetic materials, [21] and natural ores.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

et al. 2023

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A novel nanocomposite (TNTs-FeS) was developed by anchoring ferrous sulfide (FeS) nanoparticles immobilized on titanate nanotubes (TNTs) by hydrothermal method to remove U(VI) and Re(VII) from aqueous solution, and the removal mechanism and efficiency were examined. The experimental results showed that the TNTs can effectively improve the dispersibility and stability of FeS. The environmental conditions, including initial solution pH, initial concentration, equilibrium time, and dosage, played an important role in the remediation process, which can affect the immobilization efficiency significantly. The maximum quantity removal of U(VI) and Re(VII) was 291.67 and 226.23 mg/g at pH of 6.0 and 12.0. The adsorption kinetics and the equilibrium isotherms of U(VI) and Re(VII) all fitted well with the pseudo-second-order model (R 2 > 0.99) and the Freundlich model (R 2 > 0.99). The main mechanism of removal by TNTs-FeS was electrostatic attraction, chemical reduction, and surface complexation. Thus, TNTs-FeS composites exhibited a high potential to remove U(VI) and Re(VII) heavy metal ions from the surface and groundwater.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

et al. 2023

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“…The peaks at 726.4 eV (Fe 2p 1/2 ) and 713.2 eV (Fe 2p 3/2 ) were attributed to Fe(III)-O bonds, and the peaks at 724.1 eV (Fe 2p 1/2 ) and 711.2 eV (Fe 2p 3/2 ) were in agreement with Fe(II)-O bonds [ 26 ]. In addition, Fe–S bonds were observed at 710.3 eV [Fe (III)-S] and 708.4 eV [Fe (II)-S] [ 27 ], which indicated that the composites were formed with covalent bonds. The peaks at 718.5 eV and 732.5 eV were assigned to Fe (III) and Fe (II) satellites, respectively [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Superparamagnetic MoS2@Fe3O4 nanoflowers for rapid resonance-Raman scattering biodetection

Zhang

Chu

Jin

et al. 2022

J Mater Sci: Mater Electron

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Sensors for rapid and reliable detection of biomolecules are crucial for clinical medical diagnoses. Here, a rapid, ultra-sensitive, magnetic-assisted biosensor based on resonance Raman scattering at MoS 2 @Fe 3 O 4 composite nanoflowers is presented. Raman shifts and X-ray photoelectron spectra indicated that the composite was formed via Fe–S covalent bonds. Convenient magnetic separations could be performed because of the superparamagnetic Fe 3 O 4 nanoparticles. MoS 2 E 1 2g and A 1g Raman peaks were used as probe signals for anti-interference immunoassays. The probe unit of the immunoassay also included goat anti-human IgG molecules that were used as the target analyte. Au substrates coupled with the goat anti-human IgG were used as capture units to form sandwich biosensors. Because of the magnetic enrichment, the detection limit was improved by three orders-of-magnitude and the detection time was reduced from 1.5 h to 1 min. Sandwich biosensors using MoS 2 @Fe 3 O 4 nanoflowers as Raman probes could be very promising sensors for proteins, antigens, and other immunogenic biopolymers, as well as for corpuscular viruses and cells.

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“…It represents a low cost and simple operation with the possibility of regeneration and revalorization of the pollutant agent. Several materials have been reviewed in the literature as displaying capability to remove Cr(VI), including activated carbon, 4 clay, 5 carbon nanotubes, 6,7 biosorbents, 8–10 metal oxides, like ZnO, 11,12 and composites 13,14 . The latter has a band gap of 3.3–3.37 eV; it is photoactive in the UV range and, for some applications, can be more efficient than TiO 2 15,16 .…”

Section: Introductionmentioning

confidence: 99%

“…Several materials have been reviewed in the literature as displaying capability to remove Cr(VI), including activated carbon, 4 clay, 5 carbon nanotubes, 6,7 biosorbents, [8][9][10] metal oxides, like ZnO, 11,12 and composites. 13,14 The latter has a band gap of 3.3-3.37 eV; it is photoactive in the UV range and, for some applications, can be more efficient than TiO 2 . 15,16 Previous research about zinc oxide and its composites, reported they could be very efficient for the removal of several compounds from aqueous solution, including dyes, 17,18 pharmaceuticals, 19 and heavy metals.…”

mentioning

confidence: 99%

Photoinduced adsorption of Cr(VI) ions in nano‐zinc oxide and nano‐zinc oxide/polypyrrole composite

Ramos‐Hernández

Pérez‐Aguilar

Ovando‐Medina

et al. 2022

J of Applied Polymer Sci

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Zinc oxide-polypyrrole composites (ZnO-PPY) are novel materials that have attracted significant attention in recent years. These materials have the potential to remove hazardous pollutants from water effectively. Here, we explore facile synthesis, characterization, and adsorption capacity of hexavalent chromium anions, by nano-ZnO and nano-ZnO-PPY composite. Cold precipitation of ZnO using sodium dodecyl sulfate as an additive prevents nanoparticle growth, which permits the composite preparation with PPY. The results demonstrated that the ZnO-PPY structure was different than ZnO, more amorphous, less porous, and with a different morphology. New Fourier transform infrared spectroscopy vibrations observed in ZnO-PPY hinted an interaction with ZnO, leading to a more acidic surface. This information could point to the composite formation driven by interactions between oxygen groups and pyrrole nitrogen. Both materials performed better under light, indicating a photoinduced adsorption phenomenon favored by oxygen vacancies. The new composite demonstrated a reduced adsorption capacity compared to ZnO at neutral and slightly acidic pHs due to electrostatic repulsion of the negatively charged surface and Cr(VI) anions. At alkaline pHs, the pyrrolic nitrogen's is able to interact with partially charged Cr-complex and to carry out a ligand interchange even in a not favorable charge environment. The ZnO-PPY composite, outperformed the zinc oxide capacity.adsorption, composites, porous materials, surfaces and interfaces | INTRODUCTIONChromium is a heavy metal commonly produced and employed in industrial processes. The industries with the major Cr-emissions to the atmosphere are: coal combustion, steel, and iron management, cement production, tanning processing, catalysis, Cr-plating, and so forth. 1 Presently, chromium is one of the most hazardous pollutants found in wastewater and water reservoirs. Its ingestion causes several health afflictions at both short and long-term exposures, including acute effects such as gastrointestinal disorders, hemorrhagic diathesis, and convulsions. 2 Furthermore, hexavalent chromium has been classified by the International Agency for Research on Cancer as carcinogenic to humans (Group 1), and the WHO recommends an LD 50 of 20-250 mg/kg of hexavalent chromium. For that reason,

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Properties and mechanism of hexavalent chromium removal by FeS@ graphite carbon nitride nanocomposites

Cited by 36 publications

References 67 publications

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

Superparamagnetic MoS2@Fe3O4 nanoflowers for rapid resonance-Raman scattering biodetection

Photoinduced adsorption of Cr(VI) ions in nano‐zinc oxide and nano‐zinc oxide/polypyrrole composite

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