Heterogeneity of adsorption energy of water, methanol and diethyl ether on activated carbons: effect of porosity and surface chemistry

Literature Information

Publication Date 2003-04-08
DOI 10.1039/B301399P
Impact Factor 3.676
Authors

Vladimir Gun'ko, Teresa J. Bandosz


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Abstract

Three samples of activated carbon of wood origin with various amounts of surface functional groups and different porous structure were used as adsorbents of water, methanol, and diethyl ether. Structural and chemical characteristics of the samples’ surfaces were obtained using adsorption of nitrogen and Boehm titration, respectively. Adsorption isotherms of water and methanol were measured using a volumetric apparatus whereas adsorption of diethyl ether was measured by means of inverse gas chromatography at finite concentration. Then the isotherms at three different temperatures were used to calculate distributions of adsorption potential, free energy of adsorption and adsorption energy. The results showed that the strength of interactions depends on both the porosity of the sample and its surface chemistry. The effect of surface chemistry is the most important in the case of water and the least important in the case of diethyl ether. The high-energy centers are related to adsorption in narrow pores containing functional groups. For molecules consisting of hydrocarbon moiety and oxygen containing groups (methanol and diethyl ether) the surface chemistry plays a role at low surface coverages.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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