MnFe2O4-graphene oxide magnetic nanoparticles as a high-performance adsorbent for rare earth elements: Synthesis, isotherms, kinetics, thermodynamics and desorption

Ghobadi, Moslem; Gharabaghi, Mahdi; Abdollahi, Hadi; Boroumand, Zohreh; Moradian, Marzieh

doi:10.1016/j.jhazmat.2018.03.011

Cited by 133 publications

(34 citation statements)

References 54 publications

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“…In addition to the above three typical peaks appearing in CA, there are two stronger peaks at 558 cm −1 and 475 cm −1 . The former one corresponded to the intrinsic stretching vibration of manganese-oxygen (Mn-O) bonds, which was caused by the MnFe 2 O 4 of octahedral shape [39]; the latter could be attributed to the intrinsic vibration of metal-oxygen (Mn-O and Fe-O) bonds at octahedral sites from MnFe 2 O 4 [40], confirming MnFe 2 O 4 prepared in-situ over CA had spinel structure [41]. These results confirmed the presence of octahedral MnFe 2 O 4 over CA, which was in line with the evidence obtained in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling

Shang

Chiu

2019

Molecules

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The textile wash-off process consumes substantial amounts of water, which generates large volumes of wastewater that pose potential pollution issues for the environment. In the present study, catalytic ozonation was applied to degrade residual dyes present in rinsing effluents from wash-off processes towards the aim of recycling the waste effluents. A magnetic catalyst was prepared for promoting dye degradation by catalytic ozonation. Via a hydrothermal reaction, highly magnetic manganese ferrite (MnFe2O4) particles were successfully loaded on carbon aerogel (CA) materials (MnFe2O4@CA). The results showed that the developed catalyst strikingly promoted the degradation of dye contaminants by catalytic ozonation, in terms of color removal and reduction of chemical oxidation demand (COD) in rinsing effluents. COD removal efficiency in catalytic ozonation was enhanced by 25% when compared with that achieved by ozonation alone under the same treatment conditions. Moreover, we confirmed that after catalytic ozonation, the rinsing effluents could be recycled to replace fresh water without any evident compromise in the color quality of fabrics. The color difference (ΔEcmc(2:1)) between fabrics treated with recycled effluents and water was not more than 1.0, suggesting that the fabrics treated with recycled effluents displayed acceptable color reproducibility. Although colorfastness and color evenness of fabrics treated with recycled effluents were slightly poorer than those of fabrics treated with water, they were still within the acceptable tolerance. Therefore, the present study validated that catalytic ozonation was a promising technology for saving water and wastewater elimination in textile dyeing. It provides a feasibility assessment of catalytic ozonation for recycling waste effluents to reduce water dependence in textile production. Furthermore, we show a new perspective in on-site recycling waste effluents by catalytic ozonation and enrich the knowledge on feasible approaches for water management in textile production.

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Section: Resultsmentioning

confidence: 99%

Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling

Shang

Chiu

2019

Molecules

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“…For EG spectrum, the characteristic peaks located at 3441 cm −1 and 1631 cm −1 were assigned to the stretching and bending vibration of O-H groups; at 2921 and 2857 cm −1 , showed the stretching vibration of C-H in CH, CH 2 , and CH 3 ; at 2356 cm −1 , were related to CO 2 stretching vibration; at 1050 cm −1 , could be attributed to C-O-C symmetric vibration [18,19]. After decoration with MnFe 2 O 4 , some new peaks appeared at 1165 and 1121 cm −1 , which were assigned to bonded hydroxyl groups on the metal, and at 555 cm −1 , which showed intrinsic stretching vibration of Mn-O bonds characterized for octahedral manganese ferrite [20,21,22]. These results demonstrate the existence of MnFe 2 O 4 on EG.…”

Section: Resultsmentioning

confidence: 99%

The Preparation and Characterization of MnFe2O4-Decorated Expanded Graphite for Removal of Heavy Oils from Water

et al. 2019

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Recently, many methods have been developed to efficiently eliminate oil spills due to its long-term harmful effects on marine life and human health. Expanded graphite (EG) has been considered as an excellent platform to remove contaminated oil from aqueous solution through a facile adsorption route. As an innovative approach, the decoration of magnetic components, namely, MnFe2O4, into graphite layers was taken into account for facilitating phase separation under magnetic field which resulted into an easy collection of the used adsorbents in a large scale. The expanded graphite/manganese ferrite composites were prepared from Vietnamese graphite flakes via a two-stage process. Characterization was performed using Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-Ray Powder Diffraction (XRD), Vibrating Sample Magnetometer (VSM), Energy-Dispersive X-ray (EDS), and nitrogen adsorption/desorption analysis. The adsorption behavior of EG-MnFe2O4 for widespread used heavy oils, including diesel oil and crude oil, was investigated under the effects of adsorption conditions, i.e., contact time, loaded oil dosage, and salinity of mixing oil and water. The obtained results showed successful incorporation of MnFe2O4 into graphite sheets and no considerable change on the worm-like structure of EG. The results also showed that incorporated manganese ferrites enhanced the magnetism EG up to 16 emu/g, which made the recovery of used adsorbent conveniently. The EG-MnFe2O4 adsorbents exhibited the strong adsorption ability toward diesel oil (32.20 ± 0.46 g DO/g EG) and crude oil (33.07 ± 0.33 g CO/g EG). In brief, EG-MnFe2O4 material provides a potential and promising platform with high performance for oil spill removal.

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“…Periodic table contains seventeen rare earth elements including yttrium, scandium and lanthanide series elements. Most of the rare earth elements are found in China, Australia, and United States of America (USA) [1,2]. The rare earth elements are thermally stable at high temperature and good refractory materials due to their physical and chemical properties [3].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of hydrothermally synthesized porous groundnuts-like samarium oxide thin films

et al. 2020

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One pot hydrothermal method is used for synthesis of groundnuts-like samarium oxide (Sm 2 O 3) thin film on stainless steel substrate. The Sm 2 O 3 film is characterized by X-ray diffraction, water contact angle, UV-visible spectrophotometer, photoluminescence, and field emission scanning electron microscopy techniques. The hydrothermal method allows the formation of cubic Sm 2 O 3 film with porous groundnuts-like morphology. The Sm 2 O 3 film is hydrophilic with the optical band gap of 3.70 eV. Electrochemical capacitive behavior of Sm 2 O 3 film is studied using cyclic voltammetry, galvanostatic charge-discharge measurement and electrochemical impedance spectroscopy. The Sm 2 O 3 film exhibits maximum specific capacitance of 155 Fg −1 at 5 mVs −1 scan rate in 1 M KOH electrolyte.

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MnFe2O4-graphene oxide magnetic nanoparticles as a high-performance adsorbent for rare earth elements: Synthesis, isotherms, kinetics, thermodynamics and desorption

Cited by 133 publications

References 54 publications

Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling

Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling

The Preparation and Characterization of MnFe2O4-Decorated Expanded Graphite for Removal of Heavy Oils from Water

Electrochemical behavior of hydrothermally synthesized porous groundnuts-like samarium oxide thin films

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