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Molecules 2016, 21(5), 628; doi:10.3390/molecules21050628

Adsorption of Emerging Ionizable Contaminants on Carbon Nanotubes: Advancements and Challenges

Zachry Department of Civil Engineering, Texas A & M University, College Station, TX 77843, USA
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Academic Editor: Saikat Talapatra
Received: 31 March 2016 / Revised: 28 April 2016 / Accepted: 9 May 2016 / Published: 12 May 2016
(This article belongs to the Special Issue Carbon Nanotubes: Advances and Applications)
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Abstract

The superior adsorption capacity of carbon nanotubes has been well recognized and there is a wealth of information in the literature concerning the adsorption of unionized organic pollutants on carbon nanotubes. Recently, the adsorption of emerging environmental pollutants, most of which are ionizable, has attracted increasing attention due to the heightened concerns about the accumulation of these emerging contaminants in the environment. These recent studies suggest that the adsorption of emerging ionizable contaminants on carbon nanotubes exhibit different characteristics than unionized ones. For example, a new charge-assisted intermolecular force has been proposed for ionizable compounds because some adsorption phenomenon cannot be easily explained by the conventional force theory. The adsorption of ionizable compounds also displayed much stronger dependence on solution pH and ionic strength than unionized compounds. This article aims to present a brief review on the current understanding of the adsorption of emerging ionizable contaminants to carbon nanotubes and discuss further research needs required to advance the mechanistic understanding of the interactions between ionizable contaminants and carbon nanotubes. View Full-Text
Keywords: carbon nanotubes; ionizable contaminant; adsorption; surface functionalization carbon nanotubes; ionizable contaminant; adsorption; surface functionalization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ma, X.; Agarwal, S. Adsorption of Emerging Ionizable Contaminants on Carbon Nanotubes: Advancements and Challenges. Molecules 2016, 21, 628.

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