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Fe3O4 and gamma-Fe2...
Fe3O4 and gamma-Fe2O3 nanoparticles for the adsorption of Co2+ from aqueous solution
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- Uheida, Abdusalam (författare)
- KTH,Materialvetenskap
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- Salazar-Alvarez, German (författare)
- KTH,Materialvetenskap
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- Bjorkman, Eva (författare)
- KTH,Kemi
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- Zhang, Yu (författare)
- KTH,Kemi
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- Muhammed, Mamoun (författare)
- KTH,Materialvetenskap
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(creator_code:org_t)
- Elsevier BV, 2006
- 2006
- Engelska.
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 298:2, s. 501-507
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The adsorption of Co2+ ions from nitrate solutions using iron oxide nanoparticles of magnetite (Fe3O4) and maghemite (gamma-Fe2O3) has been studied. The adsorption of Co2+ ions on the surface of the particles was investigated under different conditions of oxide content, contact time, Solution pH. and initial Co2+ ion concentration. It has been found that the equilibrium can be attained in less than 5 ruin. The maximum loading capacity of Fe3O4 and gamma-Fe2O3 nanoparticles is 5.8 x 10(-5) and 3.7 x 10(-5) mol m(-2), respectively, which are much higher than the previously Studied. iron oxides and conventional ion exchange resins. Co2+ ions were also recovered by dilute nitric acid from the loaded gamma-Fe2O3 and Fe3O4 with an efficiency of 86 and 30%. respectively. That has been explained by the different mechanisms by including both the surface and Structural loadings of Co2+ ions. The Surface adsorption of Co2+ on Fe3O4 and gamma-Fe2O3 nanoparticles has been found to have the same mechanism of ion exchange reaction between Co2+ in the solution and proton bonded on the particle Surface. The conditional equilibrium constants of surface 2-adsorption of Co2+ on Fe3O4 and gamma-Fe-O-2(3) nanoparticles have been determined to be log K = -3.3 +/- 0.3 and -3.1 +/- 0.2, respectively. The Structural loading of Co2+ ions into Fe3O4 lattice has been found to be the ion exchange reaction between CO2+ and Fe2+ while that into gamma-Fe2O3 lattice to fill its vacancy. The effect of temperature on the adsorption of Co2+ was also investigated, and the value of enthalpy change was determined to be 19 kJ mol(-1)
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- adsorption
- magnetite
- maghemite
- cobalt(II)
- nanoparticles
- magnetite particles
- reaction-kinetics
- iron-oxide
- ions
- hematite
- goethite
- cadmium
- desorption
- cobalt(ii)
- sorption
- Materials chemistry
- Materialkemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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