http://dx.doi.org/10.1021/sc500061a">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Mutual effects of dialkyl phthalate esters and humic acid sorption on carbon nanotubes in aqueous environments

Language

English

Abstract

Various reaction sequences of mutual sorptions of dimethyl phthalate (DMP) or diethyl phthalate (DEP) and humic acid (HA) on single-walled carbon nanotubes (SWCNT) and multi-walled carbon nanotubes (MWCNT) were studied. The results indicate that the sorption of DMP and DEP on CNT decreases owing to its competition effect in the presence of HA. The competition is stronger at lower HA concentration. At higher HA concentration, weaker competition has occurred because there are steric hindrance and pore blockage of HA on CNT. The reaction sequences of DMP (or DEP) and HA sorption could affect their sorption mechanisms. The initial sorbed HA can modify the surface properties of CNT with a concomitant effect on the partial complexation of DMP (or DEP) with the sorbed HA. The Fourier transform infrared (FTIR) spectra indicate that SWCNT and MWCNT contain mainly -COO- and -COOH moieties, respectively. In addition, the IR spectroscopic and thermogravimetric analyses illustrate that CNTs provide similar sorption capacity regardless of the interaction sequence of DMP (or DEP) and HA. Finally, the fluorescence quenching results indicate that DEP exhibits stronger binding to HA than that of DMP. © 2014 American Chemical Society.

Keywords

Carbon nanotubes, Dialkyl phthalate esters, Humic acid, Mutual sorption, Reaction sequence

Publication Date

2014

Source Publication Title

ACS Sustainable Chemistry and Engineering

Volume

2

Issue

5

Start Page

1219

End Page

1227

Publisher

American Chemical Society

ISSN (electronic)

21680485

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