Competitive Sorption of Pyrene, Phenanthrene, and Naphthalene on Multiwalled Carbon Nanotubes
- 18 August 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 40 (18), 5804-5810
- https://doi.org/10.1021/es061081n
Abstract
Knowledge of toxic chemical sorption by carbon nanotubes (CNTs) is critical for environmental application of CNTs as superior sorbents and for environmental risk assessment of both CNTs and toxic chemicals. Single-solute sorption results were reported in the literature, however, they cannot be used for predicting pollutant sorption by CNTs in wastewater and natural water systems where multiple organic contaminants are present. In this study, competitive sorption of pyrene, phenanthrene, and naphthalene on a multiwalled CNT material was investigated. All isotherms in single-, bi-, and tri-solute systems were fitted well by the Dubinin−Ashtakhov (DA) model. The isotherm of a given primary solute changed from being significantly nonlinear to nearly linear when competitors were added. The observed competitive sorption depended on the relative equilibrium concentrations of both primary and cosolutes. Significant competition was observed at relatively low concentrations of primary solute and high concentrations of competitors, while competition was much weaker in the case of relatively high concentrations of primary solute and low competitor concentrations. When the relative concentration of primary solute (Ce/Cs) approached 1, competition by other solutes seemed to disappear. Sorption and competition of three polycyclic aromatic hydrocarbons (PAHs) on CNTs could not be explained with either pore-filling or partition−adsorption mechanisms. A Polanyi-based surface adsorption mechanism was proposed to interpret the observed sorption and competition.Keywords
This publication has 11 references indexed in Scilit:
- Adsorption of Polycyclic Aromatic Hydrocarbons by Carbon NanomaterialsEnvironmental Science & Technology, 2006
- Nanoparticles and the EnvironmentJournal of the Air & Waste Management Association, 2005
- Multi-walled carbon nanotube interactions with human epidermal keratinocytesToxicology Letters, 2004
- Nanoparticles: Health impacts?Materials Today, 2004
- Brain uptake of thiamine-coated nanoparticlesJournal of Controlled Release, 2003
- Adsorption of 1,2-dichlorobenzene from water to carbon nanotubesChemical Physics Letters, 2003
- Exposure to Carbon Nanotube Material: Assessment of Nanotube Cytotoxicity using Human Keratinocyte CellsJournal of Toxicology and Environmental Health, Part A, 2003
- Identification and Characterization of Sorption Domains in Soil Organic Matter Using Structurally Modified Humic AcidsEnvironmental Science & Technology, 2003
- Poly(ethylene glycol)-Coated Hexadecylcyanoacrylate Nanospheres Display a Combined Effect for Brain Tumor TargetingThe Journal of pharmacology and experimental therapeutics, 2002
- A distributed reactivity model for sorption by soils and sediments. 2. Multicomponent systems and competitive effectsEnvironmental Science & Technology, 1993