Magnetic and Mössbauer studies of fucan-coated magnetite nanoparticles for application on antitumoral activity

Silva, V. A. J.; Andrade, Priscyla Lima de; Bustamante, Ángel; Valladares, L. De Los Santos; Mejía, Mirian E.; Souza, I. A.; Cavalcanti, Karen Pena de Souza; Silva, M. P. C.; Aguiar, J. Albino

doi:10.1007/978-94-007-6482-8_26

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…In AC, an absorption peak was observed at 454.5 cm The C=O tensile vibration is appeared at 1632.06 cm -1 . Furthermore, absorption peaks at 2853.09 and 2922.67 cm -1 belong to the -COOH carboxyl group and peak at 3425.91 cm -1 belongs to the O-H hydroxyl group vibration (Gupta et al, 2011;Silva et al, 2013;Burks et al, 2014).…”

Section: Characetrization Of Ac@fe3o4@sdsmentioning

confidence: 99%

Decoration of Ziziphus spina-christi leaves derived-activated carbon with Fe3O4 nanoparticles and SDS surfactant for removal of Cr3+ from polluted water

Koutenaei

Vatankhah

Esmaeili

2022

Preprint

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The purpose of this study was to remove Cr3+ ions from polluted water using AC@Fe3O4@SDS nanocomposite. The physical and surface features of the nanocomposite were investigated with EDS, DLS, XRD, BET, FTIR, SEM and TEM analyses. The BET surface area and the mean pore diameter of the AC@Fe3O4@SDS were 102.04 m2/g and 169.49 oA, respectively, indicating the high porosity of the aforementioned nanocomposite. DLS and XRD analyses showed that the mean particle size and mean crystal size of AC@Fe3O4@SDS were 78.9 nm and 28 nm, respectively. Also, the highest Cr3+ removal efficiency (99.5%) using the AC@Fe3O4@SDS nanocomposite was obtaind at pH= 7, contact time= 40 min, temperature= 55 ºC, the Cr3+ ion concentration= 10 mg/L and the nanocomposite dosage= 2 g/L, which is the highest Cr3+ removal efficiency ever achieved. Moreover, the utmost sorption capacity obtained from the Langmuir model was 120.48 mg/g, which is a significant value compared to previous studies for Cr3+ removal. Furthermore, the isotherm and kinetic studies of the sorption process indicated that the Cr3+ sorption process using the aforementioned nanocomposite followed the quasi-second order and Freundlich equations due to higher correlation coefficients. Subsequently, the thermodynamic study demonstrated that the sorption process of Cr3+ ions using AC@Fe3O4@SDS is favorable, feasible, spontaneous and endothermic.

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Section: Characetrization Of Ac@fe3o4@sdsmentioning

confidence: 99%

Decoration of Ziziphus spina-christi leaves derived-activated carbon with Fe3O4 nanoparticles and SDS surfactant for removal of Cr3+ from polluted water

Koutenaei

Vatankhah

Esmaeili

2022

Preprint

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“…During the past five decades, Mössbauer spectroscopy has become an increasingly important analytical tool for characterization of synthetic and natural Fe-containing materials, such as soils, sediments, oxides and oxyhydroxides (Da Costa et al, 1998) Since Bauminger et al (1961) first used Mössbauer spectroscopy to discuss magnetite, many researchers have used this method to further study magnetite (Singhvi et al, 1986;Persoons et al, 1990;Helgason et al, 1994;Peev, 1995;Peev et al, 1995;Rodriguez et al, 2007;Silva et al, 2014). The isomer shift of Mössbauer spectroscopy is particularly sensitive to the oxidation state of iron.…”

Section: Mössbauer Spectramentioning

confidence: 99%

Determination of Fe²⁺/Fe³⁺ Ratios of Magnetite using Different Methods: A Case Study from the Qimantag Metallogenic Belt

et al. 2022

Acta Geologica Sinica (Eng)

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Determination of Fe2+/Fe3+ ratios from metallogenic belts to explore controlling physical and chemical conditions of rock formation is of great significance. In order to explore magnetite Fe2+/Fe3+ ratios of the Qimantag metallogenic belt, part of the Eastern Kunlun orogenic belt in the northeastern margin of the Qinghai–Tibetan plateau, western Central Orogenic Belt of China, and overcome the limitation of the traditional electronic probe, five different measurement methods are proposed and their respective advantages and disadvantages evaluated, with the composition data of the magnetite obtained using electron probe microanalysis (EPMA). The direct oxygen measurement method has a significant impact on the determination results of FeO and Fe2O3, but the accuracy and uniformity of the results are low. The valence method (Flank method) based on the spectral intensity ratio of Lα to Lβ for iron is also unreliable for FeO and Fe2O3 measurements because it is difficult to establish a relationship between Lβ/Lα, the spectral intensity ratio, and the Fe2+/Fe3+ content ratio. In comparison, the charge difference method, the surplus‐oxygen method and the Mössbauer spectrum method are still the most favorable. Mössbauer spectroscopy, with its isomer movement particularly sensitive to the oxidation state of iron, yields results closer to 0.5, which is relatively reliable. Earlier magnetite deposits are located in intrusions or contact zones and formed by magmatic fluids with high Fe2+/Fe3+ ratios, whereas later magnetite deposits are farther away from intrusions and have low Fe2+/Fe3+ ratios. The transformation mechanism of hematite and magnetite in the Qimantage metallogenic belt is also studied. No large volume changes, such as pore filling and shrinkage fracture, were detected in the metallogenic belt, and the transformation mechanism is more similar to a reoxidation and reduction mechanism.

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Magnetic and Mössbauer studies of fucan-coated magnetite nanoparticles for application on antitumoral activity

Cited by 2 publications

References 34 publications

Decoration of Ziziphus spina-christi leaves derived-activated carbon with Fe3O4 nanoparticles and SDS surfactant for removal of Cr3+ from polluted water

Decoration of Ziziphus spina-christi leaves derived-activated carbon with Fe3O4 nanoparticles and SDS surfactant for removal of Cr3+ from polluted water

Determination of Fe²⁺/Fe³⁺ Ratios of Magnetite using Different Methods: A Case Study from the Qimantag Metallogenic Belt

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Magnetic and Mössbauer studies of fucan-coated magnetite nanoparticles for application on antitumoral activity

Cited by 2 publications

References 34 publications

Decoration of Ziziphus spina-christi leaves derived-activated carbon with Fe3O4 nanoparticles and SDS surfactant for removal of Cr3+ from polluted water

Decoration of Ziziphus spina-christi leaves derived-activated carbon with Fe3O4 nanoparticles and SDS surfactant for removal of Cr3+ from polluted water

Determination of Fe2+/Fe3+ Ratios of Magnetite using Different Methods: A Case Study from the Qimantag Metallogenic Belt

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Determination of Fe²⁺/Fe³⁺ Ratios of Magnetite using Different Methods: A Case Study from the Qimantag Metallogenic Belt