Abstract
This study investigates the distribution behavior of superparamagnetic multiwalled carbon nanotubes (SPM-MWCNTs) in an aqueous system containing Lake Tai sediment. Specifically, the effects of dissolved organic matter (DOM) and sediment on SPM-MWCNTs under various conditions and the interaction forms between them were evaluated through a modified mathematical model and characterization. The results showed that DOM can stabilize SPM-MWCNTs by providing sterically and electrostatically stable surfaces, even under high sodium concentrations. The fitting accuracy of the Freundlich adsorption isotherm is higher than that of the Langmuir adsorption isotherm. Therefore, the adsorption of SPM-MWCNT on the sediment should proceed through a multiple, complex and heterogeneous adsorption mechanism. Characterization analyses indicated that DOM may serve as a bridge for the inorganic adsorption between SPM-MWCNTs and sediment. This study is the first to investigate the distribution behavior of magnetite coated carbon nanotubes (CNTs), which simplified the separation and quantification considerably. The findings of this study will serve as a valuable reference for future studies of magnetic CNTs.
Highlights
Sediment system, the interaction between Carbon nanotubes (CNTs) and sediment is extremely complex, except for the direct adsorption to a solid phase, CNTs can interact with the DOM released from sediment[24,25]
It appears that the Fe3O4 nanoparticles have been homogeneously presiding on the surface of multi-walled carbon nanotubes (MWCNTs), which has been further proved by XPS (Fig. 2b) and XRD analysis (Fig. 2c)
These results indicate that the Fe3O4 nanoparticles have been successfully attached to the MWCNTs
Summary
Sediment system, the interaction between CNTs and sediment is extremely complex, except for the direct adsorption to a solid phase, CNTs can interact with the DOM released from sediment[24,25]. A superparamagnetic nanocomposite composed of multi-walled carbon nanotubes (MWCNTs) and Fe3O4 nanoparticles was prepared; this nanocomposite is referred to as SPM-MWCNT for short below. The distribution of the composite in an aqueous system was examined using a modified mathematical model. The quantification was simplified considerably through measuring the iron content in SPM-MWCNTs. In addition, one can separate SPM-MWCNTs from the solution, effectively facilitating morphological and property characterization. To the best of our knowledge, this study is the first to consider the distribution of magnetic CNTs, which would provide a useful and meaningful basis for the future study of magnetic nanocomposites
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