Journal of Soils and Sediments

, Volume 10, Issue 5, pp 845–854

Adsorption kinetics of 17α-ethinyl estradiol and bisphenol A on carbon nanomaterials. II. Concentration-dependence

ISMESS 2009 • RESEARCH ARTICLE

Abstract

Purpose

Carbon nanomaterials (CNMs) have attracted a great deal of research interest for their potential environmental applications because of their unique properties. Adsorption of organic chemicals on CNMs was reported to be important in controlling their environmental risks. However, the kinetics of the adsorption is hardly investigated in literature. The objective of this work was, therefore, to quantitatively describe the sorption kinetics of 17 α-ethinyl estradiol (EE2) and bisphenol A (BPA) on CNMs as compared to activated carbon (AC).

Materials and methods

Batch adsorption/desorption (kinetic) experiments were conducted, and different kinetic models were used to process experimental data and obtain kinetic parameters.

Results and discussion

CNM adsorption kinetics could be described well using the improved pseudo second order kinetics model, and negative relationships were observed between the equilibrium solid-phase concentration and the modified rate constant (k2a*). The rearrangement of CNM aggregates after adsorbing high concentrations of adsorbates could be the reason of decreased adsorption rate with increasing EE2 or BPA loading on CNMs. The diffusion-controlled kinetic process seems not important for the adsorption of EE2 and BPA on CNMs; whereas, their adsorption on AC appears to be diffusion controlled, as indicated by a linear relationship between solid-phase concentration and t0.5.

Conclusions

Single-walled carbon nanotubes adsorb large amounts of EE2 and BPA fast and retain them strongly. These results suggest that single-walled carbon nanotubes have potential for applications in the treatment and purification of water contaminated by the chemicals.

Keywords

Endocrine disrupting chemicals Mathematical modeling Nanotechnology Rate constant Water treatment 

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.College of Environmental Science and EngineeringKunming University of Science and TechnologyKunmingPeople’s Republic of China
  2. 2.Department of Plant, Soil and Insect SciencesUniversity of MassachusettsAmherstUSA

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