Synthesis and characterization of magnetite nanoparticles via the chemical co-precipitation method

Petcharoen, Karat; Sirivat, Anuvat

doi:10.1016/j.mseb.2012.01.003

Cited by 743 publications

(391 citation statements)

References 39 publications

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“…The bands at 324-354 and 550-586 cm -1 correspond bending vibration of Fe-O bond and are attributed to formation of ferrite phase 22) . The absorbance difference of synthetized magnetite from commercial one is observed at 1635 and 3448 cm -1 indicating bending vibration of O-H bonding remaining at the magnetite surface 23) . Different from magnetite, FT-IR spectra of silica coated magnetite ( Fig.…”

Section: Functional Groupsmentioning

confidence: 96%

Adsorption of Au(III), Cu(II) and Ni(II) on Magnetite Coated with Mercapto Groups Modified Rice Hull Ash Silica

Nuryono¹,

Muliaty²,

Rusdiarso³

et al. 2014

J.I.E.

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Adsorption of Au(III) in multi-metal systems Au/Cu/Ni on mercapto modified silica coated on magnetite (Fe 3 O 4 /SiO 2 -SH) has been studied. Fe 3 O 4 /SiO 2 -SH was synthesized via sol-gel process by using magnetite obtained through co-precipitation of Fe 2+ /Fe 3+ salt mixture with NH 4 OH as the precipitating solution, sodium silicate solution extracted from rice hull ash and 3-mercaptopropyltrimethoxysilane (MPTMS) as the mercapto group source. Fe 3 O 4 /SiO 2 -SH was characterized with Fourier transform infrared (FTIR) spectrophotometer, X-ray diffraction (XRD) and ion chromatography for sulfur analysis. Optimization of Au(III) adsorption in a batch system was carried out as function of pH, contact time and ion concentration. Adsorption kinetics was evaluated with pseudo-first order and pseudo-second order models based on the data of contact time variation, while the adsorption isotherm was studied based on Langmuir and Freundlich models. The adsorbed metal ions Au(III), Cu(II) and Ni(II) quantitatively were calculated based on the difference of metal concentrations before and after adsorption analyzed with flame atomic absorbance spectrophotometer (FAAS). Results of characterization showed that Fe 3 O 4 /SiO 2 -SH has been successfully synthesized. Adsorption of Au(III) on Fe 3 O 4 /SiO 2 -SH slightly decreased with increasing the pH in a range of 2.0-6.0 and fits to pseudo-second order model with the rate constant of 1.37x10 -3 g mg -1 min -1 . Fe 3 O 4 /SiO 2 -SH shows a linear plot of Langmuir isotherm model with adsorption the capacity for Au(III) of 125 mg/g. Adsorption on multimetal systems shows that capacity of Au(III) on Fe 3 O 4 /SiO 2 -SH is higher than that of Cu(II) and Ni(II), and high selectivity for Au(III) toward Cu(II) and Ni(II) ions.

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Section: Functional Groupsmentioning

confidence: 96%

Adsorption of Au(III), Cu(II) and Ni(II) on Magnetite Coated with Mercapto Groups Modified Rice Hull Ash Silica

Nuryono¹,

Muliaty²,

Rusdiarso³

et al. 2014

J.I.E.

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“…The results of measurements of the specific saturation magnetization (M s ) of the two samples of Mg/Al-NO 3 hydrotalcite, MHT and UMHT, yielded the value M s of MHT (13.48 emu/g) that was higher than that of UMHT (6.18 emu/g). The M s values decrease with decreasing particle size due to the reduction in crystallinity of the magnetic domain [15]. These results indicate that particle size of UMHT smaller than MHT.…”

Section: Adsorption Studiesmentioning

confidence: 81%

“…1A). In addition, there are weak absorption bands at wavenumber 1627 and 3402 or 3448 cm -1 which are the stretching vibration of OH groups on the surface of the magnetite indicating that the complete crystallization process [15][16]. The hydrolyzation on the surface of a Fe 3 O 4 cause the presence of -OH groups shows the formation Fe(OH) 2 , Fe(OH) 3 and FeOOH [17].…”

Section: Adsorption Studiesmentioning

confidence: 99%

Adsorption of [AuCl4]– on Ultrasonically and Mechanical-Stirring Assisted Mg/Al-NO3 Hydrotalcite-Magnetite

et al. 2018

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“…3). This result indicated that the crystal structure of Fe3O4 was not change after coating by FA [25,[32][33]. Fe3O4-FA has smaller size indicated that coated Fe3O4 successfully dispersed in smaller size instead of uncoated Fe3O4.…”

Section: X-ray Diffractionmentioning

confidence: 91%

Synthesis of Fulvic Acid-Coated Magnetite (Fe3O4–FA) and Its Application for the Reductive Adsorption of [AuCl4]–

2017

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Synthesis and characterization of magnetite nanoparticles via the chemical co-precipitation method

Cited by 743 publications

References 39 publications

Adsorption of Au(III), Cu(II) and Ni(II) on Magnetite Coated with Mercapto Groups Modified Rice Hull Ash Silica

Adsorption of Au(III), Cu(II) and Ni(II) on Magnetite Coated with Mercapto Groups Modified Rice Hull Ash Silica

Adsorption of [AuCl<sub>4</sub>]<sup>–</sup> on Ultrasonically and Mechanical-Stirring Assisted Mg/Al-NO<sub>3</sub> Hydrotalcite-Magnetite

Synthesis of Fulvic Acid-Coated Magnetite (Fe<sub>3</sub>O<sub>4</sub><sup>–</sup>FA) and Its Application for the Reductive Adsorption of [AuCl<sub>4</sub>]<sup>–</sup>

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