Nanofibrillar cellulose-chitosan composite film electrodes: Competitive binding of triclosan, Fe(CN)63-/4-, and SDS surfactant

Kostoula Tsourounaki, Michael J. Bonné, Wim Thielemans, Elefteria Psillakis, Matthew Helton, Anthony McKee, Frank Marken

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Glassy carbon electrodes are modified with a thin film of a cellulose-chitosan nanocomposite. Cellulose nanofibrils (of ca. 4 nm diameter and 250 nm length) are employed as an inert backbone and chitosan (poly-D-glucosamine, low molecular weight, 75-85% deacetylated) is introduced as a structural binder and "receptor" or molecular binding site. The composite films are formed in a solvent evaporation method and prepared in approximately 0.8 μm thickness. The adsorption of three molecular systems into the cellulose-chitosan films is investigated and approximate Langmuirian binding constants are evaluated: i) Fe(CN)64- (K Ferrocyanide = 2.2 × 103 mol-1 dm 3 in 0.1 M phosphate buffer at pH 6) is observed to bind to ammonium chitosan functionalities (present at pH < 7), ii) triclosan (K Triclosan = 2.6 × 103 mol-1 dm 3 in 0.1 M phosphate buffer pH 9.5) is shown to bind only weakly and under alkaline conditions, and iii) the anionic surfactant dodecylsulfate (KSDS = 3.3 × 104 mol-1 dm3 in 0.1 M phosphate buffer pH 6) is shown to bind relatively more strongly in acidic media. The competitive binding of Fe(CN)64- and dodecylsulfate anions is proposed as a way to accumulate and indirectly determine the anionic surfactant.

Original languageEnglish
Pages (from-to)2395-2402
Number of pages8
JournalElectroanalysis
Volume20
Issue number22
DOIs
Publication statusPublished - 1 Nov 2008

Keywords

  • Cellulose
  • Chitosan
  • Diffusion
  • Electrochemistry
  • SDS
  • Sensors
  • Sisal
  • Sodium dodecylsulfate
  • Textile
  • Triclosan
  • Voltammetry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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