Fe3O4@C Nanoparticles Synthesized by In Situ Solid-Phase Method for Removal of Methylene Blue

Abstract

Fe3O4@C nanoparticles were prepared by an in situ, solid-phase reaction, without any precursor, using FeSO4, FeS2, and PVP K30 as raw materials. The nanoparticles were utilized to decolorize high concentrations methylene blue (MB). The results indicated that the maximum adsorption capacity of the Fe3O4@C nanoparticles was 18.52 mg/g, and that the adsorption process was exothermic. Additionally, by employing H2O2 as the initiator of a Fenton-like reaction, the removal efficiency of 100 mg/L MB reached ~99% with Fe3O4@C nanoparticles, while that of MB was only ~34% using pure Fe3O4 nanoparticles. The mechanism of H2O2 activated on the Fe3O4@C nanoparticles and the possible degradation pathways of MB are discussed. The Fe3O4@C nanoparticles retained high catalytic activity after five usage cycles. This work describes a facile method for producing Fe3O4@C nanoparticles with excellent catalytic reactivity, and therefore, represents a promising approach for the industrial production of Fe3O4@C nanoparticles for the treatment of high concentrations of dyes in wastewater.

Poly(catechol) modified Fe3O4 magnetic nanocomposites with continuous high Fenton activity for organic degradation at neutral pH

“…The octahedral sites in the magnetite structure can accommodate both Fe(II) and Fe(III)simultaneously. Hence the reversible transformation of Fe(II)/Fe(III) can happen within the same structure during Fenton reaction (Wang et al, 2020;Wang et al, 2010), that is to say, Fe(III) transforms to (Cai et al, 2021;Xiang et al, 2021).…”

Electrochemical Synthesis of Graphene from Waste Discharged Battery Electrodes and Its Applications to Preparation of Graphene/Fe3O4/Chitosan‐Nanosorbent for Organic Dyes Removal

“…This q max is higher and more impressive than those of formerly reported Fe 3 O 4 ‐based adsorbent materials such as Fe 3 O 4 @C nanoparticles, [14a] Fe x O y /C nanocomposites [15] or Fe 3 O 4 /chitosan/graphene oxide [1e] . However, q max of the FGC nanosorbent is lower than that of magnetic hybrid metal‐organic frameworks (Fe 3 O 4 ‐COOH/HKUST‐1) [16] (Table 3).…”

Carbon Double Coated Fe3O4@C@C Nanoparticles: Morphology Features, Magnetic Properties, Dye Adsorption

“…Kinetics, equilibrium and thermodynamics of dye adsorption by the one step fabricated Fe 3 O 4 @C NPs were studied in [ 10 ]. Much research was conducted on the removal of methylene blue and other dyes from water [ 11 , 12 , 13 , 14 , 15 , 16 ]. The high adsorption capacity of Fe 3 O 4 @C nanoparticles together with easy magnetic separation and the possibility of reuse noted in these works stimulate the search for new technological solutions for further improving the characteristics of adsorbents based on these kinds of NPs.…”