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Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics

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Abstract

The adsorption of catechol (1,2-dihydroxybenzene) on graphene nanoplatelets (GNPs) is investigated electrochemically and spectroscopically. The reversible adsorption of catechol on GNPs is Langmuirian with an adsorption constant of (0.2 ± 0.002) mM−1 at low adsorbate concentrations (≤100 mM). At higher concentrations (>100 mM) the adsorption of catechol on GNPs is shown to undergo a flat to vertical concentration driven phase transition. The kinetics of desorption are measured with a single particle electrochemical technique. The study of individual impacts allows the determination of the rate of catechol desorption from GNPs to be k = 0.08 ± 0.01 s−1 with first order kinetics. The method provides a powerful and efficient generic approach to study adsorption and, importantly, desorption of molecules on nanomaterials, as well as giving insight into the modification process.

Graphical abstract: Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics

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Publication details

The article was received on 24 Mar 2017, accepted on 30 Apr 2017 and first published on 04 May 2017


Article type: Edge Article
DOI: 10.1039/C7SC01331K
Citation: Chem. Sci., 2017, Advance Article
  • Open access: Creative Commons BY-NC license
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    Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics

    L. Chen, X. Li, E. E. L. Tanner and R. G. Compton, Chem. Sci., 2017, Advance Article , DOI: 10.1039/C7SC01331K

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