Document Detail

Factors affecting the sorption of model environmental pollutants onto silver polydimethylsiloxane nanocomposite Raman substrates.
MedLine Citation:
PMID:  15527515     Owner:  NLM     Status:  MEDLINE    
The presence of aromatic compounds in water is an important topic in environmental sciences. Silver-polydimethylsiloxane nanocomposites (Ag-PDMS) have recently been demonstrated as promising substrates for the detection of model environmental pollutants via surface-enhanced Raman spectroscopy (SERS). This work discusses how different variables such as pH and matrix composition can affect the sorption and SERS activity of these chemicals. The results show that the conjugate base of weak acids can interact more efficiently with the substrate, leading to an increased signal at higher pH, while amino-aromatic compounds interact more efficiently at a lower pH. The sorption of these chemicals is an essential step in the process and has been attributed to the absorption of the analyte into the PDMS followed by its adsorption to the metallic surface. In addition, the presence of moderate concentrations (1 x 10(-4) M) of a supporting electrolyte such as nitrate or fluoride can improve the sorption of 4-hydroxybenzoic acid to the Ag-PDMS nanoparticles. Other ions such as phosphate and chloride cause rapid oxidation of the substrates even at concentrations as low as 1 x 10(-5) M. The effect of these variables in the analysis of real samples is presented. The potential use of liquid chromatography for isolating the model pollutants from detrimental matrix components in nat- ural waters is also shown.
M A De Jesús; K S Giesfeldt; M J Sepaniak
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Applied spectroscopy     Volume:  58     ISSN:  0003-7028     ISO Abbreviation:  Appl Spectrosc     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-11-05     Completed Date:  2004-12-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372406     Medline TA:  Appl Spectrosc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1157-64     Citation Subset:  IM    
University of Tennessee-Knoxville, Department of Chemistry, 552 Buehler Hall, Knoxville, Tennessee 37996-1600, USA.
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MeSH Terms
Dimethylpolysiloxanes / chemistry*
Models, Chemical*
Nanotechnology / methods*
Silver / chemistry*
Spectrum Analysis, Raman / methods*
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Dimethylpolysiloxanes; 0/Water Pollutants, Chemical; 7440-22-4/Silver

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