Clusters of superparamagnetic iron oxide nanoparticles capped with palm shell extract and modified with chitosan: Catalytic applications for degradation of cationic and anionic dyes and their binary mixtures

Vaanamudan, Ageetha; Sarkar, Mitesh; Sadhu, Mohini; Pamidimukkala, Padmaja

doi:10.1016/j.jece.2019.103244

Cited by 12 publications

(1 citation statement)

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“…Improper disposal of toxic and recalcitrant pollutants is a major problem since it brings serious risks to the health of living beings and causes environmental deterioration. 20,21 The removal of dyes commonly found in industrial effluents by IONPs has been extensively studied, [22][23][24][25][26][27][28] among them the heterogeneous Fenton system plays a central role to mineralize the contaminant. 2,[6][7][8]10,11 IONPs prepared by a green route with extracts of black tea, 7 Yerba Mate, 6,8 and green tea, 11 were applied in the degradation of the dye methyl orange.…”

Section: Introductionmentioning

confidence: 99%

Effect of Camellia sinensis Origin and Heat Treatment in the Iron Oxides Nanomaterials Composition and Fenton Degradation of Methyl Orange

Franco¹,

Silva²,

Licea³

et al. 2023

J. Braz. Chem. Soc.

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Sustainable and environmentally friendly methods for nanomaterials synthesis have been emerging recently. The use of extracts of polyphenol-rich plants with high reducing and chelating power is advantageous because the polyphenol can protect the nanomaterial from agglomeration and deactivation. Green nanomaterials have been applied in several areas, including remediation of toxic organic pollutants from contaminated effluents. Herein, we describe the preparation of green iron oxide nanoparticles (IONPs) with extracts of the plant Camellia sinensis as black tea for dye removal application. The as-prepared IONPs were composed of amorphous FeOOH and FeII/III-polyphenol complexes. To obtain crystalline and pure iron-based nanomaterials, the amorphous precursor was annealed at 900 ºC. Samples of black tea from different regions were used to verify the reproducibility of the iron phases formed. The same iron phases were obtained for all black tea samples, α-Fe2O3 (hematite), FePO4, and Fe3PO7, but in different proportions. The materials were applied as heterogeneous-Fenton catalysts for the removal of the dye methyl orange. The amorphous as-prepared IONPs were more active than the respective annealed IONPs due to the proton release from the polyphenol into the reaction medium, setting the pH to around 3, which is the optimum pH for the Fenton system.

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