<abstract xmlns="http://www.w3.org/1999/xhtml"> In this study, halloysite-Fe3O4composites were synthesized by a chemical-precipitation method to facilitate magnetic separation of the sorbents from aqueous solution. The research focused on the effect of Fe3O4phase on the halloysite sorption properties. The X-ray diffraction (XRD) results confirmed successful deposition of Fe3O4particles on a halloysite surface. They showed that the coating with Fe3O4particles enhanced the halloysite adsorption affinity toward Cd(II) and Pb(II). The highest adsorption capacity was determined for the composites having 10% of the surface deposited with Fe3O4. In this case, the adsorption capacity for Cd(II) and Pb(II) was 33 and 112 mmol·kg-1, respectively. The point of zero charge (pHPZC) and desorption results indicated that the removal mechanism of metals is mainly related to chemisorption involving reaction with hydroxyls of either halloysite or Fe3O4phase. The ion exchange is of limited importance due to the low cation exchange capacity (CEC) of halloysite - Fe3O4composites.</abstract>

In this study, halloysite-Fe3O4composites were synthesized by a chemical-precipitation method to facilitate magnetic separation of the sorbents from aqueous solution. The research focused on the effect of Fe3O4phase on the halloysite sorption properties. The X-ray diffraction (XRD) results confirmed successful deposition of Fe3O4particles on a halloysite surface. They showed that the coating with Fe3O4particles enhanced the halloysite adsorption affinity toward Cd(II) and Pb(II). The highest adsorption capacity was determined for the composites having 10% of the surface deposited with Fe3O4. In this case, the adsorption capacity for Cd(II) and Pb(II) was 33 and 112 mmol·kg-1, respectively. The point of zero charge (pHPZC) and desorption results indicated that the removal mechanism of metals is mainly related to chemisorption involving reaction with hydroxyls of either halloysite or Fe3O4phase. The ion exchange is of limited importance due to the low cation exchange capacity (CEC) of halloysite - Fe3O4composites.

Halloysite Composites with Fe3O4Particles: The Effect of Impregnation on the Removal of Aqueous Cd(II) And Pb(II)

Mineralogia

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Halloysite Composites with FeOParticles: The Effect of Impregnation on the Removal of Aqueous Cd(II) And Pb(II)

In this study, halloysite-Fe3O4composites were synthesized by a chemical-precipitation method to facilitate magnetic separation of the sorbents from aqueous...

Halloysite Composites with Fe₃O₄Particles: The Effect of Impregnation on the Removal of Aqueous Cd(II) And Pb(II)

Published Online: Dec 01, 2017

Page range: 107 - 126

Received: Apr 03, 2017

Accepted: Aug 29, 2017

DOI: https://doi.org/10.1515/mipo-2017-0014

Keywords
Fe3O4 particles, Halloysite, Adsorption, Cd(II), Pb(II)

© 2018 Paulina Maziarz, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Halloysite Composites with Fe3O4Particles: The Effect of Impregnation on the Removal of Aqueous Cd(II) And Pb(II)

Published Online: Dec 01, 2017

Page range: 107 - 126

Received: Apr 03, 2017

Accepted: Aug 29, 2017

DOI: https://doi.org/10.1515/mipo-2017-0014

KeywordsFe3O4 particles, Halloysite, Adsorption, Cd(II), Pb(II)

© 2018 Paulina Maziarz, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Halloysite Composites with Fe₃O₄Particles: The Effect of Impregnation on the Removal of Aqueous Cd(II) And Pb(II)

Keywords
Fe3O4 particles, Halloysite, Adsorption, Cd(II), Pb(II)