Adsorption and Fenton oxidation of azo dyes by magnetite nanoparticles deposited on a glass substrate

Ünal, Bahar Özbey; Bilici, Zeynep; Ugur, Naz; Işık, Zelal; Harputlu, Ersan; Dizge, Nadir; Ocakoğlu, Kasım

doi:10.1016/j.jwpe.2019.100897

Cited by 45 publications

(9 citation statements)

References 43 publications

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“…This result might be contributed by the fact that the PSS‐coated MNPs submerged in hydrogen peroxide solution will lead to the formation of hydroxyl free radicals through Fenton reaction. The highly oxidative hydroxyl free radicals formed will oxidize the MB dyes on the adsorbent surface, 40 which will eventually help in the recovery of PSS‐coated MNPs, as shown in Fig. 7(b).…”

Section: Resultsmentioning

confidence: 99%

Study on the enhancement of colloidal stable poly(sodium 4‐styrene sulfonate) coated magnetite nanoparticles and regeneration capability for rapid magnetophoretic removal of organic dye

Chong

Lim

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: A good colloidal stability of magnetite nanoparticles (MNPs) dispersion is of utmost importance for its environmentally related applications. In the present work, a water-soluble anionic polyelectrolyte, poly(sodium 4-styrene sulfonate) (PSS), was used to stabilize dispersions of MNPs in a pH-dependent aqueous medium. RESULTS: An excellent methylene blue (MB) dye removal efficiency at equilibrium of up to 94% has been observed by the colloidally stabilized nano-magnetites. Dynamic light scattering and electrophoretic analysis showed that the PSS-coated MNPs exhibited better colloidal stability, with an almost constant hydrodynamic diameter of ∼150 nm and insignificant clustering behavior throughout the measuring time scale of 5 h. Transmission electron microscopy evidenced the success coating of PSS onto MNPs. In terms of its chemical resistance, the PSS-coated MNPs were able to tolerate a wide pH range from 2 to 10. This work depicts a simple physiochemical coating method to stabilize dispersions of nano-magnetites, which promoted a better MB adsorption capacity of PSScoated MNPs at 14.9 mg g-1 than the naked MNPs at 10.38 mg g-1. The adsorption process follows Langmuir isotherm and pseudo-second-order reaction kinetics with both correlations R 2 > 0.99. PSS-coated MNPs demonstrated outstanding regeneration capacity for four batch adsorption cycles with an almost consistent MB removal efficiency higher than 85%. CONCLUSION: This in-house developed nano-sorbent has potential in economical applications with a less budgeted adsorbent replacement (at least 4 cycles of regeneration) for low-cost separation of pollutants, such as MB from polluted water.

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Section: Resultsmentioning

confidence: 99%

Study on the enhancement of colloidal stable poly(sodium 4‐styrene sulfonate) coated magnetite nanoparticles and regeneration capability for rapid magnetophoretic removal of organic dye

Chong

Lim

et al. 2020

J of Chemical Tech & Biotech

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“…A comparative table has been provided emphasizing the superior efficiency of this process (Table ). − …”

Section: Resultsmentioning

confidence: 99%

Unveiling the Synergistic Effect of Magnetite and ZrPO₄ for Highly Selective Removal of Anionic Azo Dyes via an Ion-Exchange Process

Swain,

Sahoo,

Majhi

et al. 2023

ACS Appl. Eng. Mater.

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This work represents a facile process based on ion exchange for the efficient removal of toxic and carcinogenic anionic azo dyes from industrial effluents. Azo dyes pose significant environmental challenges due to their high solubility and stability in water bodies. For this purpose, a magnetically retrievable nanocomposite Fe 3 O 4 /ZrPO 4 (FZ) has been designed. The FZ nanocomposite, consisting of nano zirconium phosphate (ZrPO 4 ) supported on magnetite nanoparticles (Fe 3 O 4 NPs), demonstrates synergistic interaction between the ion-exchange properties of ZrPO 4 and the magnetic properties of Fe 3 O 4 , leading to improved selectivity and recyclability for the removal of anionic azo dye. Characterization of the synthesized FZ nanocomposites was carried out by using X-ray diffraction, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and vibrating sample magnetometry. The removal efficiency of FZ has been verified by taking reactive azo dyes including congo red (CR), reactive blue 1 (RB-1), reactive orange 16 (RO-16), and reactive violet 5 (RV-5). The reported nanocatalyst exhibits impressive adsorption capabilities, removing around 99% for CR and RB-1, 97% for RO-16, and 78% for RV-5 within 5 min in an acidic medium. The nanocomposite's magnetic property allows efficient separation from reaction mixtures, and the ion-exchange property enables its reusability for more than 15 catalytic cycles. Further, optimization of the pH of the reaction medium resulted in faster, cost-effective, more efficient separation and regeneration of the nanocomposites. The industrial applicability of this nanocomposite has been verified by treatment with synthetic wastewater. The findings hold promise for addressing environmental concerns associated with azo dye contamination in industrial effluents.

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“…With further increasing the dosage of H 2 O 2 to 6.5 mmol L −1 , a slightly decrease in the catalytic efficiency can be seen due to the scavenging effect of • OH radicals by the excess of H 2 O 2 . Moreover, hydroperoxyl radicals generated in the existence of excess H 2 O 2 present a weaker oxidation potential than hydroxyl radicals, reducing the oxidation efficiency of organic compounds (Sahoo et al 2014;Unal et al 2019). Thus, the H 2 O 2 concentration of 2.5 mmol L −1 , which reached 93% of color removal in 60 min, was determined to be the appropriate dosage for Ponceau 4R removal by the photo-Fenton process catalyzed by FeIn 2 S 4 .…”

Section: Effect Of H 2 O 2 Dosagementioning

confidence: 99%

Novel application of FeIn2S4 as an efficient photo-Fenton catalyst for degradation of Ponceau 4R in aqueous solution

Grassi

Salla

Jahn

et al. 2021

Int. J. Environ. Sci. Technol.

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The chalcogenide composite FeIn 2 S 4 was prepared by hydrothermal route and, for the first time, investigated as a heterogeneous catalyst in the photo-Fenton treatment for Ponceau 4R dye (C 20 H 11 N 2 Na 3 O 10 S 3 ) under visible irradiation. The composite was characterized by X-ray diffraction (DRX), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectrometry (EDS) and elemental mapping, band gap energy and X-ray photoelectron spectroscopy (XPS). The optimal experimental conditions were investigated and determined to be pH 3.0, 0.5 g L −1 of catalyst and 2.5 mmol L −1 of H 2 O 2 . A decolorization efficiency of 93.3% was achieved in 60 min of reaction and a TOC removal of 92.3% was reached in 180 min. The stability and recycle capacity of FeIn 2 S 4 indicated that the catalyst can be used more than four times without considerable loss of efficiency. Free radicals investigation revealed that • OH and O 2•− radicals were the major oxygen reactive species involved on Ponceau 4R degradation. The lower-mass intermediates from Ponceau 4R degradation were identified, and a mechanism for the photo-Fenton treatment was suggested. Therefore, the composite showed a performance that makes it a promising catalyst for removing emerging contaminants in water.

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Adsorption and Fenton oxidation of azo dyes by magnetite nanoparticles deposited on a glass substrate

Cited by 45 publications

References 43 publications

Study on the enhancement of colloidal stable poly(sodium 4‐styrene sulfonate) coated magnetite nanoparticles and regeneration capability for rapid magnetophoretic removal of organic dye

Study on the enhancement of colloidal stable poly(sodium 4‐styrene sulfonate) coated magnetite nanoparticles and regeneration capability for rapid magnetophoretic removal of organic dye

Unveiling the Synergistic Effect of Magnetite and ZrPO₄ for Highly Selective Removal of Anionic Azo Dyes via an Ion-Exchange Process

Novel application of FeIn2S4 as an efficient photo-Fenton catalyst for degradation of Ponceau 4R in aqueous solution

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Adsorption and Fenton oxidation of azo dyes by magnetite nanoparticles deposited on a glass substrate

Cited by 45 publications

References 43 publications

Study on the enhancement of colloidal stable poly(sodium 4‐styrene sulfonate) coated magnetite nanoparticles and regeneration capability for rapid magnetophoretic removal of organic dye

Study on the enhancement of colloidal stable poly(sodium 4‐styrene sulfonate) coated magnetite nanoparticles and regeneration capability for rapid magnetophoretic removal of organic dye

Unveiling the Synergistic Effect of Magnetite and ZrPO4 for Highly Selective Removal of Anionic Azo Dyes via an Ion-Exchange Process

Novel application of FeIn2S4 as an efficient photo-Fenton catalyst for degradation of Ponceau 4R in aqueous solution

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Unveiling the Synergistic Effect of Magnetite and ZrPO₄ for Highly Selective Removal of Anionic Azo Dyes via an Ion-Exchange Process