(810h) Development of Single-Wall Carbon Nanotube Adsorbent Systems for Removal of Organic Compounds From Aqueous Environments

Carbon nanotubes show promise as effective adsorbents for environmental applications.  Both single-wall carbon nanotubes (SWCNT) and multi-walled carbon nanotubes (MWCNT) have demonstrated strong uptake of various organic compounds, including herbicides and toxins such as trichloroethylene (TCE).  In this presentation, a previously-developed semi-empirical model for the adsorption of a model polyaromatic compound is reviewed. Using the model as a framework, the time-dependent and equilibrium adsorption of 2,4-dicholorophenoxyacetic acid (2,4-D) on SWCNT is examined.  This compound is of particular interest in that it is typically used in fertilizing systems and can lead to contamination of groundwater. Using UV spectroscopy techniques, adsorption of 2,4-D is measured to obtain kinetic and equilibrium parameters and compared against model predictions.  Comparison between activated carbon, graphene, and SWCNTs show that SWCNTs have a much higher affinity for adsorption of 2,4-D and better adsorption capacity over time.  A practical perspective on the use of SWCNTs for environmental remediation is discussed.