The point of zero charge and adsorption properties of natural magnetite

Milonjić, Slobodan K.; Kopečni, M. M.; Ilić, Z.

doi:10.1007/bf02519745

Cited by 70 publications

(33 citation statements)

References 14 publications

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“…Alternatively the PZC (point of zero charge) of the nanomaterials plays an important role for the binding of metal ions to nanomaterials. From the literature it can be seen that many of metal oxide nanomaterials especially Fe 3 O 4 have PZC above pH 6 (ranges from 6.5 to 9.9) [30]. However, Mn 3 O 4 has a PZC around pH 4.5, which helps to explain the dramatic decrease in binding observed between pH 4 and pH 5 for the Mn 3 O 4 nanomaterial as seen Figure 2 E [31].…”

Section: 0 Results and Discussionmentioning

confidence: 99%

Study of As(III) and As(V) oxoanion adsorption onto single and mixed ferrite and hausmannite nanomaterials

García¹,

Sardar²,

Maldonado³

et al. 2014

Microchemical Journal

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The removal of arsenic(III) and arsenic(V) from an aqueous solution through adsorption on to Fe3O4, MnFe2O4, 50% Mn substituted Fe3O4, 75% Mn substituted Fe3O4, and Mn3O4 nanomaterials was investigated. Characterization of the nanomaterials using XRD showed only pure phases for Mn3O4, MnFe2O4, and Fe3O4. The 50% and 75% substituted nanomaterials were found to be mixtures of Mn3O4 and Fe3O4. From batch studies the optimum binding pH of arsenic(III) and arsenic(V) to the nanomaterials was determined to be pH 3. The binding capacity for As(III) and As(VI) to the various nanomaterials was determined using Isotherm studies. The binding capacity of Fe3O4 was determined to be 17.1 mg/g for arsenic(III) and 7.0 mg/g for arsenic(V). The substitution of 25% Mn into the Fe3O4 lattice showed a slight increase in the binding capacity for As(III) and As(VI) to 23.8 mg/g and 7.9 mg/g, respectively. The 50% substituted showed the maximum binding capacity of 41.5 mg/g and 13.9 mg/g for arsenic(III) and arsenic(V). The 75% Mn substituted Fe3O4 capacities were 16.7 mg/g for arsenic(III) and 8.2 mg/g for arsenic(V). The binding capacity of the Mn3O4 was determined to be 13.5 mg/g for arsenic(III) and 7.5 mg/g for arsenic(V). In addition, interference studies on the effects of SO2−4, PO3−4, Cl−, and NO−3 investigated. All the interferences had very minimal effects on the As(III) and As(V) binding never fell below 20% even in the presence of 1000 ppm interfering ions.

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Section: 0 Results and Discussionmentioning

confidence: 99%

Study of As(III) and As(V) oxoanion adsorption onto single and mixed ferrite and hausmannite nanomaterials

García¹,

Sardar²,

Maldonado³

et al. 2014

Microchemical Journal

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“…The point of zero charge (PZC) for magnetite has been reported in the range of 6 to 8.2 [38][39][40][41]. At pH = 6 (CoSO 4 ؒ7H 2 O/KSCN solution pH), cobalt thiocyanate anions may be adsorbed onto the magnetite surface via FeOH 2 + groups [25].…”

Section: Resultsmentioning

confidence: 99%

Magnetic nanoparticles: Properties and potential applications

Vatta

Sanderson

Koch

2006

Pure and Applied Chemistry

120

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Magnetic particles may be used to selectively attach and manipulate or transport targeted species to a desired location under the influence of an external magnetic field. By virtue of their size, magnetic nanoparticles are superparamagnetic, offering great potential in a variety of applications in their bare form or through coating with a surface coating and functional group chosen for a specific application. In this paper, and in order to illustrate this concept, three applications for the use of magnetic nanoparticles will be discussed, namely, in magnetic liquids for densimetric separation, in therapeutic and diagnostic testing, and in effluent processing and metal ion removal.

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“…Then the obtained silica gel was dried in an air oven at 383 K for 24 h. The dried material was crushed and then sieved, and a <50-µm fraction was used (designated as SiO 2 -P) for further investigation. The other laboratory-made silica gel sample was prepared by coagulation of silica sol, containing uniform particles (9 nm in diameter) obtained from sodium silicate solution by an ionexchange method [7] described previously. Coagulation of the sol was carried out by adding 0.5 M NaCl at pH 10.0.…”

Section: Methodsmentioning

confidence: 99%