Document Detail


Kinetics and thermodynamics of sorption of nitroaromatic compounds to as-grown and oxidized multiwalled carbon nanotubes.
MedLine Citation:
PMID:  18977488     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The sorption kinetics and thermodynamics of 1,3-dinitrobenzene (DNB), m-nitrotoluene (mNT), p-nitrophenol (pNP), and nitrobenzene (NB) on as-grown and nitric acid-oxidized multiwalled carbon nanotubes (MWCNTs) were investigated. The sorption kinetics was well described by a pseudo-second-order rate model, while both Langmuir and Freundlich models described the sorption isotherms well and the sorption thermodynamic parameters of equilibrium constant (K(0)), standard free energy (DeltaG), standard enthalpy (DeltaH), and standard entropy changes (DeltaS) were measured. The values of DeltaH and DeltaG suggested that the sorption of nitroaromatics (NACs) onto MWCNTs was exothermic and spontaneous. The structure, number, and position of nitro groups of NACs were the main factors affecting the sorption rate and capacity. Treatment of the MWCNTs with nitric acid increased both the surface area and the pore volume and introduced oxygen-containing functional groups to the MWCNTs, which depressed the sorption of NACs onto MWCNTs.
Authors:
Xiu-E Shen; Xiao-Quan Shan; De-Ming Dong; Xiu-Yi Hua; Gary Owens
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Publication Detail:
Type:  Journal Article     Date:  2008-11-01
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  330     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2008-12-01     Completed Date:  2009-02-09     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-8     Citation Subset:  -    
Affiliation:
College of Environment and Resources, Jilin University, Changchun 130012, China.
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