Mechanistic insights into biomimetic carbonic anhydrase action catalyzed by doped carbon nanotubes and graphene

Literature Information

Publication Date 2017-02-13
DOI 10.1039/C7CP00556C
Impact Factor 3.676
Authors

Manju Verma, Parag A. Deshpande


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Abstract

Electronic structural analyses of hydrogen terminated metal doped carbon nanotube/graphene (M-CNT/Gr, MN3-CNT/Gr, M = Ru/Rh) and ruthenium cluster decorated carbon nanotube/graphene (Ru4-CNT/Gr) were carried out for examining the biomimetic catalytic activity towards CO2 hydration reaction. The carbonic anhydrase action was followed for the reaction of CO2 with H2O resulting in a bicarbonate ion and a proton. All the catalysts were found to be active for CO2 hydration and the mechanism proved them to be biomimetic. Interconversion of CO2 to a HCO3− ion took place with five elementary steps viz. OH− formation by H2O dissociation, linear CO2 complexation, CO2 bending by nucleophilic attack of an OH− ion over CO2, HCO3− ion formation by intramolecular proton migration and HCO3− ion displacement by H2O addition. Free energy landscapes over the catalysts were developed for CO2 hydration reaction. The activation energies of H2O dissociation and CO2 bending were observed to be substantially smaller over Ru4-CNT when compared to those over the other catalysts. Ru4-CNT was found to be the best catalyst for CO2 hydration with the rate limiting step being HCO3− ion formation.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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