Magnetic Mesoporous Carbons Derived from in Situ MgO Template Formation for Fast Removal of Heavy Metal Ions.

ABSTRACT: In this paper, magnetic mesoporous carbon composites were prepared by calcination of the mixture of magnesium citrate and Fe₃O₄@SiO₂ in an inert atmosphere. A high content of Fe₃O₄@SiO₂ and MgO was in situ embedded in a carbon matrix. After removing the MgO template by diluted acid, the resulting material (Fe₃O₄@SiO₂@mC) was subjected to further H₂O₂ oxidation treatment. The formed oxygen-containing functional groups on the products provided plenty of active sites for the adsorption of analytes of interest. The obtained composites (Fe₃O₄@SiO₂@mC-H₂O₂) exhibited a mesoporous structure with a high specific surface area of 731 m² g^-1. The adsorption capacities of Fe₃O₄@SiO₂@mC-H₂O₂ for Cu(II) and Pb(II) were calculated to be 86.5 and 156 mg g^-1, respectively. Under optimal conditions, the adsorption isotherm of Cu(II) and Pb(II) onto Fe₃O₄@SiO₂@mC-H₂O₂ fitted the Langmuir model and the adsorption kinetic was well-correlated with the pseudo-second-order model. Besides, Fe₃O₄@SiO₂@mC-H₂O₂ exhibited fast removal dynamics (within less than 1 min) for Cu(II) and Pb(II), demonstrating great application potential in wastewater treatment.

SUBMITTER: Zhang Q 

PROVIDER: S-EPMC6641504 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature