Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics
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<sup>−1</sup> at low adsorbate concentra...
| Main Authors: | , , , |
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| Format: | Journal article |
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Royal Society of Chemistry
2017
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| _version_ | 1797073430213820416 |
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| author | Chen, L Li, X Tanner, E Compton, R |
| author_facet | Chen, L Li, X Tanner, E Compton, R |
| author_sort | Chen, L |
| collection | OXFORD |
| description | 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<sup>−1</sup> 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<sup>−1</sup> 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. |
| first_indexed | 2024-03-06T23:22:02Z |
| format | Journal article |
| id | oxford-uuid:690caebe-2b76-4d7b-8067-925aa7176cd0 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T23:22:02Z |
| publishDate | 2017 |
| publisher | Royal Society of Chemistry |
| record_format | dspace |
| spelling | oxford-uuid:690caebe-2b76-4d7b-8067-925aa7176cd02022-03-26T18:48:56ZCatechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kineticsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:690caebe-2b76-4d7b-8067-925aa7176cd0Symplectic Elements at OxfordRoyal Society of Chemistry2017Chen, LLi, XTanner, ECompton, RThe 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<sup>−1</sup> 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<sup>−1</sup> 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. |
| spellingShingle | Chen, L Li, X Tanner, E Compton, R Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics |
| title | Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics |
| title_full | Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics |
| title_fullStr | Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics |
| title_full_unstemmed | Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics |
| title_short | Catechol adsorption on graphene nanoplatelets: isotherm, flat to vertical phase transition and desorption kinetics |
| title_sort | catechol adsorption on graphene nanoplatelets isotherm flat to vertical phase transition and desorption kinetics |
| work_keys_str_mv | AT chenl catecholadsorptionongraphenenanoplateletsisothermflattoverticalphasetransitionanddesorptionkinetics AT lix catecholadsorptionongraphenenanoplateletsisothermflattoverticalphasetransitionanddesorptionkinetics AT tannere catecholadsorptionongraphenenanoplateletsisothermflattoverticalphasetransitionanddesorptionkinetics AT comptonr catecholadsorptionongraphenenanoplateletsisothermflattoverticalphasetransitionanddesorptionkinetics |