Chemically surface-modified carbon nanoparticle carrier for phenolic pollutants: Extraction and electrochemical determination of benzophenone-3 and triclosan

L Vidal, A Chisvert, A Canals, E Psillakis, Alexei A Lapkin, Fernando Acosta, K J Edler, James A Holdaway, F Marken

Research output: Contribution to journalArticle

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Abstract

Chemically surface-modified (tosyl-functionalized) carbon nanoparticles (Emperor 2000 from Cabot Corp.) are employed for the extraction and electrochemical determination of phenolic impurities such as benzophenone-3 (2-hydroxy-4-methoxybenzophenone) or triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol). The hydrophilic carbon nanoparticles are readily suspended and separated by centrifugation prior to deposition onto suitable electrode surfaces and voltammetric analysis. Voltammetric peaks provide concentration information over a 10-100 mu M range and an estimated limit of detection of ca. 10 mu M (or 2.3 ppm) for benzophenone-3 and ca. 20 mu M (or 5.8 ppm) for triclosan. Alternatively, analyte-free carbon nanoparticles immobilized at a graphite or glassy carbon electrode surface and directly immersed in analyte solution bind benzophenone-3 and triclosan (both with an estimated Langmuirian binding constants of K approximate to 6000 mol(-1) dm(3) at pH 9.5) and they also give characteristic voltammetric responses (anodic for triclosan and cathodic for benzophenone-3) with a linear range of ca. 1-120 mu M. The estimated limit of detection is improved to ca.5 mu M (or 1.2 ppm) for benzophenone-3 and ca. 10 mu M (or 2.3 ppm) for triclosan. Surface functionalization is discussed as the key to further improvements in extraction and detection efficiency.
LanguageEnglish
Pages28-35
Number of pages8
JournalAnalytica Chimica Acta
Volume616
Issue number1
DOIs
StatusPublished - 26 May 2008

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Triclosan
Nanoparticles
Carbon
pollutant
carbon
electrode
Limit of Detection
Electrodes
graphite
phenol
Graphite
Centrifugation
Glassy carbon
oxybenzone
nanoparticle
Impurities
detection

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Chemically surface-modified carbon nanoparticle carrier for phenolic pollutants: Extraction and electrochemical determination of benzophenone-3 and triclosan. / Vidal, L; Chisvert, A; Canals, A; Psillakis, E; Lapkin, Alexei A; Acosta, Fernando; Edler, K J; Holdaway, James A; Marken, F.

In: Analytica Chimica Acta, Vol. 616, No. 1, 26.05.2008, p. 28-35.

Research output: Contribution to journalArticle

Vidal, L ; Chisvert, A ; Canals, A ; Psillakis, E ; Lapkin, Alexei A ; Acosta, Fernando ; Edler, K J ; Holdaway, James A ; Marken, F. / Chemically surface-modified carbon nanoparticle carrier for phenolic pollutants: Extraction and electrochemical determination of benzophenone-3 and triclosan. In: Analytica Chimica Acta. 2008 ; Vol. 616, No. 1. pp. 28-35
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abstract = "Chemically surface-modified (tosyl-functionalized) carbon nanoparticles (Emperor 2000 from Cabot Corp.) are employed for the extraction and electrochemical determination of phenolic impurities such as benzophenone-3 (2-hydroxy-4-methoxybenzophenone) or triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol). The hydrophilic carbon nanoparticles are readily suspended and separated by centrifugation prior to deposition onto suitable electrode surfaces and voltammetric analysis. Voltammetric peaks provide concentration information over a 10-100 mu M range and an estimated limit of detection of ca. 10 mu M (or 2.3 ppm) for benzophenone-3 and ca. 20 mu M (or 5.8 ppm) for triclosan. Alternatively, analyte-free carbon nanoparticles immobilized at a graphite or glassy carbon electrode surface and directly immersed in analyte solution bind benzophenone-3 and triclosan (both with an estimated Langmuirian binding constants of K approximate to 6000 mol(-1) dm(3) at pH 9.5) and they also give characteristic voltammetric responses (anodic for triclosan and cathodic for benzophenone-3) with a linear range of ca. 1-120 mu M. The estimated limit of detection is improved to ca.5 mu M (or 1.2 ppm) for benzophenone-3 and ca. 10 mu M (or 2.3 ppm) for triclosan. Surface functionalization is discussed as the key to further improvements in extraction and detection efficiency.",
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