Effects of functional group concentration, type, and configuration on their saturation of methanol adsorption on functionalized graphite

Dilokekunakul, Waralee; Klomkliang, Nikom; Phadungbut, Poomiwat; Chaemchuen, Somboon; Supasitmongkol, Somsak

doi:10.1016/j.apsusc.2019.144121

Cited by 9 publications

(5 citation statements)

References 43 publications

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“…Such “defected” carbon not only helps to disperse and form the stable interface with TiO 2 NPs but also enhances the adsorption of MeOH. The significant adsorption of MeOH between two neighboring hydroxyl groups and next considerable adsorption of MeOH on less active groups on functionalized graphite were recently claimed . Beside the role of NP attachment and chemisorption sites, the defects/functional groups on graphene are desired for increasing a tunneling probability, that is, to enhance the visible light activity, but their amount should be reasonable to ensure a transport channel-inhibiting electron–hole recombination rate .…”

Section: Resultsmentioning

confidence: 99%

Few Layer Graphene/TiO₂ Composites for Enhanced Solar-Driven H₂ Production from Methanol

Marouazi

Jiménez‐Calvo

Breniaux

et al. 2021

ACS Sustainable Chem. Eng.

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Here is presented the elaboration of Few Layer Graphene/TiO 2 photocatalytic composites (FLG/TiO 2 ) with FLG loadings from 0.5 to 11 wt.%. Contrary to commonly used (reduced) graphene oxide obtained by long and harsh conditions synthesis, FLG was synthesized by simple, fast, efficient and eco-friendly exfoliation method. The enhancement of defective/functionalized sites density for attachment of TiO 2 species was achieved via calcination process at 450 °C. The nanocomposites were evaluated toward H 2 production from methanol under artificial solar light irradiation, without the use of a co-catalyst. It was observed that the best activities are provided by the composites with the lowest loading: 0.5 and 1.0 wt.% FLG/TiO 2 that are 2-3 times more efficient than reference and commercial TiO 2 . The photocatalytic activity of the composites was correlated to their surface area, morphological, structural, optical properties and kinetics of free electron mobility properties. The enhanced activity is attributed to higher surface area, better photogenerated charges separation thanks to electrons' delocalization and trapping onto graphene layers well interfaced with TiO 2 nanoparticles, but also to additional FLG visible light absorption properties and charge carriers' generation. The impact of enhanced FLG edges defects/functionalities is reflected as well via selected analysis and hydrogen generation.

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Section: Resultsmentioning

confidence: 99%

Few Layer Graphene/TiO₂ Composites for Enhanced Solar-Driven H₂ Production from Methanol

Marouazi

Jiménez‐Calvo

Breniaux

et al. 2021

ACS Sustainable Chem. Eng.

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“…The cutoff radius was 3nm, and the periodic boundary condition was applied at the boundaries in the x and y directions parallel to the surface. The calculations of the surface excess, isosteric heat, and local density distributions can be found elsewhere. ,, …”

Section: Theory and Methodsmentioning

confidence: 99%

“…The calculations of the surface excess, isosteric heat, and local density distributions can be found elsewhere. 20,47,51 3. RESULTS AND DISCUSSION 3.1.…”

Section: Theory and Methodsmentioning

confidence: 99%

Molecular Insights into the Effect of Temperature and Functional Groups on the Nonwetting, Prewetting, Partial Wetting, and Complete Wetting Transitions of Ethanol on Graphite

Dilokekunakul

Chaemchuen

Klomkliang

2021

Ind. Eng. Chem. Res.

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Adsorption of ethanol on pure and oxygenated graphite surfaces in the 120−425 K temperature range was conducted to microscopically investigate wetting transitions using a Grand Canonical Monte Carlo Simulation. At temperatures <120 K, ethanol displayed nonwetting on the pure graphite substrate. Interestingly, in the temperature range 120−159 K, it transitioned to prewetting and displayed partial wetting at higher temperatures (159−278 K). Complete wetting occurred at further temperatures (>278 K). On the isotherm, partial wetting had two vertical jumps to a complete monolayer (∼6 μmol/m 2 ) and a second layer (∼14 μmol/m 2 ) sequentially. The thin-to-thick film of prewetting had only one vertical jump to complete two layers simultaneously. When functionalized graphite was considered, nonwetting and prewetting of pure graphite at low temperatures (<120 and 120−159 K) could be transferred to partial wetting. According to the results of this study, the transition from prewetting to partial wetting occurs not only with higher substrate affinity but also at higher temperatures.

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“…Though more content of N does not promise the improvement in the capacity of CO 2 capture, moreover this is associated with the nitrogen species type used and their structure on the surface of activated carbon. 153 When comparing with other N-containing species like pyrrole-like N species, pyridine and pyridine N-oxide, pyridine-like N species signicantly enhances the capacity of CO 2 uptake, due to their stronger basic nature. 154 Usually, the N atom can be incorporated on the carbon surface in two ways.…”

Section: Porous Carbon-based Materialsmentioning

confidence: 99%

Carbon dioxide adsorption based on porous materials

et al. 2021

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Effects of functional group concentration, type, and configuration on their saturation of methanol adsorption on functionalized graphite

Cited by 9 publications

References 43 publications

Few Layer Graphene/TiO₂ Composites for Enhanced Solar-Driven H₂ Production from Methanol

Few Layer Graphene/TiO₂ Composites for Enhanced Solar-Driven H₂ Production from Methanol

Molecular Insights into the Effect of Temperature and Functional Groups on the Nonwetting, Prewetting, Partial Wetting, and Complete Wetting Transitions of Ethanol on Graphite

Carbon dioxide adsorption based on porous materials

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Effects of functional group concentration, type, and configuration on their saturation of methanol adsorption on functionalized graphite

Cited by 9 publications

References 43 publications

Few Layer Graphene/TiO2 Composites for Enhanced Solar-Driven H2 Production from Methanol

Few Layer Graphene/TiO2 Composites for Enhanced Solar-Driven H2 Production from Methanol

Molecular Insights into the Effect of Temperature and Functional Groups on the Nonwetting, Prewetting, Partial Wetting, and Complete Wetting Transitions of Ethanol on Graphite

Carbon dioxide adsorption based on porous materials

Contact Info

Product

Resources

About

Few Layer Graphene/TiO₂ Composites for Enhanced Solar-Driven H₂ Production from Methanol

Few Layer Graphene/TiO₂ Composites for Enhanced Solar-Driven H₂ Production from Methanol