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Georges Grevillot

Bio: Georges Grevillot is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Adsorption & Activated carbon. The author has an hindex of 17, co-authored 45 publications receiving 909 citations. Previous affiliations of Georges Grevillot include University of Lorraine & École nationale supérieure des industries chimiques.

Papers
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TL;DR: In this article, benzene and activated carbon were used as the working system and a theoretical analysis was developed in a wide temperature range up to 400°C, no VOC vapor could be condensed in mesopores with the strong micropore adsorption effect.
Abstract: Electrothermal desolption is an electricity-promoted desolption technology developed only in the last decade It is extremely eficient and straightforward when the adsorbent is electrically conductive, since heating can be achieved by the Joule effect The volatile organic compound (VOC) vapors desorbing from micropores might redistribute and condense in mesopores with high concentration, which is possible since no dilution occurs To study this problem, benzene and activated carbon were used as the working system, and a theoretical analysis was developed In a wide temperature range up to 400°C, no VOC vapor could be condensed in mesopores with the strong micropore adsorption effect With the weak micropore adsorption effect, however, mesopore condensation will occur, but it only takes place in mesopores smaller than 3 nm in diameter, and the amount is generally negligible To prevent any possible condensation, the desorption temperature should at least equal the liquid boiling point calculated in a 2-nm capillary tube

14 citations

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TL;DR: The data show that the toxicity of cigarette smoke may be largely due to its high level of CO2, and suggest that carbon dioxide may play a key role in the causation of these diseases by tobacco smoking.
Abstract: Tobacco smoking is responsible for a vast array of diseases, particularly chronic bronchitis and lung cancer. It is still unclear which constituent(s) of the smoke is responsible for its toxicity. The authors decided to focus on carbon dioxide, since its level of concentration in mainstream cigarette smoke is about 200 times higher than in the atmosphere. The authors previously demonstrated that inhalation of carbon dioxide concentrations above 5% has a deleterious effect on lungs. In this study, the authors assessed the inflammatory potential of carbon dioxide contained in cigarette smoke. Mice were exposed to cigarette smoke containing a high or reduced CO(2) level by filtration through a potassium hydroxyde solution. The inflammatory response was evaluated by histological analysis, protein phosphatase 2 A (PP2A) and nuclear factor (NF)-kappaB activation, and proinflammatory cytokine secretion measurements. The data show that the toxicity of cigarette smoke may be largely due to its high level of CO(2). Pulmonary injuries consequent to tobacco smoke inhalation observed by histology were greatly diminished when CO(2) was removed. Cigarette smoke exposure causes an inflammatory response characterized by PP2A and NF-kappaB activation followed by proinflammatory cytokine secretion. This inflammatory response was reduced when the cigarette smoke was filtered through a potassium hydroxide column, and reestablished when CO(2) was injected downstream from the filtration column.Given that there is an extensive literature linking a chronic inflammatory response to the major smoking-related diseases, these data suggest that carbon dioxide may play a key role in the causation of these diseases by tobacco smoking.

14 citations

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TL;DR: In this article, the behavior of amino acids on columns of strong anion-exchange resins in displacement chromatography was studied and a new technology allowing the minimization of pollutant reagents was applied.
Abstract: This work is a study of the behavior of amino acids on columns of strong anion-exchange resins in displacement chromatography. A new technology allowing the minimization of pollutant reagents was applied. It consists of using dissolved carbon dioxide in water as a displacer. The emphasis was also placed on the use of unbuffered solutions of amino acids in water. A mathematical model for the displacement process was constructed. Ion-exchange equilibrium relations based on variable selectivity coefficients and dissociation reactions of amino acids were incorporated in the model. It is shown that, in the case of negligible hydrodynamic and kinetic resistances, pure and concentrated products could be obtained.

13 citations

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TL;DR: In this article, a multicomponent, non-linear model that takes into account the dissociation reaction in liquid phase is used to predict the separation and to investigate the effect of the resin type on the performance of parametric pumping.

13 citations

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TL;DR: In this paper, the authors extended the theory of equilibrium staged parametric pumps with discrete fluid transfers to open, fractionating systems, operating in cyclic steady state, and derived the optimal feed stage location, minimum reflux, and the separation factor for given operating conditions.
Abstract: The theory of equilibrium staged parametric pumps with discrete fluid transfers has been presented in previous papers for total reflux. Here, it is extended to open, fractionating systems, operating in cyclic steady state. The cases of and enriching section, a stripping section, and a complete fractionating apparatus are successively considered. Providing adequate variables are defined, the result is a diagram which plays the same role as the McCabe-Thiele diagram in distillation. The optimal feed stage location, the minimum reflux, and the separation factor for given operating conditions are determined analytically and graphically in the case of linear equilibrium isotherms. The method is then generalized to non-linear equilibria, particularly of constant relative volatility type.

13 citations


Cited by
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TL;DR: In this article, the authors review the current state-of-the-art of CO2 capture, transport, utilisation and storage from a multi-scale perspective, moving from the global to molecular scales.
Abstract: Carbon capture and storage (CCS) is broadly recognised as having the potential to play a key role in meeting climate change targets, delivering low carbon heat and power, decarbonising industry and, more recently, its ability to facilitate the net removal of CO2 from the atmosphere. However, despite this broad consensus and its technical maturity, CCS has not yet been deployed on a scale commensurate with the ambitions articulated a decade ago. Thus, in this paper we review the current state-of-the-art of CO2 capture, transport, utilisation and storage from a multi-scale perspective, moving from the global to molecular scales. In light of the COP21 commitments to limit warming to less than 2 °C, we extend the remit of this study to include the key negative emissions technologies (NETs) of bioenergy with CCS (BECCS), and direct air capture (DAC). Cognisant of the non-technical barriers to deploying CCS, we reflect on recent experience from the UK's CCS commercialisation programme and consider the commercial and political barriers to the large-scale deployment of CCS. In all areas, we focus on identifying and clearly articulating the key research challenges that could usefully be addressed in the coming decade.

2,088 citations

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TL;DR: This review discusses recent research developments of VOC adsorption onto a variety of engineered carbonaceous adsorbents, including activated carbon, biochar, activated carbon fiber, carbon nanotube, graphene and its derivatives, carbon-silica composites, ordered mesoporous carbon, etc.

915 citations

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TL;DR: In this paper, a comparative analysis of the literature reports on the recent trends in the enzyme immobilization by adsorption is presented, where both carriers, carrier modifiers and procedures developed for effective adaption of the enzymes are discussed.
Abstract: Endowed with unparalleled high catalytic activity and selectivity, enzymes offer enormous potential as catalysts in practical applications. These applications, however, are seriously hampered by enzymes’ low thermal and chemical stabilities. One way to improve these stabilities is the enzyme immobilization. Among various tested methods of this process that make use of different enzyme-carrier interactions, immobilization by adsorption on solid carriers has appeared most common. According to these findings, in this review we present a comparative analysis of the literature reports on the recent trends in the immobilization of the enzymes by adsorption. This thorough study was prepared in order to provide a deeper understanding of the process. Both carriers, carrier modifiers and procedures developed for effective adsorption of the enzymes are discussed. The review may thus be helpful in choosing the right adsorption scheme for a given enzyme to achieve the improvement of its stability and activity for a specific application.

633 citations

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TL;DR: In this paper, a summary of the use of lignocellulosic-based precursors to obtain activated carbon is provided, including physicochemical, micro/nanostructural, surface chemistry, textural and adsorption capacity features.
Abstract: Activated carbon is a porous material that has been in many important ages of the human history. Lignocellulosic precursors and biomass sources have become important materials to produce it because their use produces many benefits, mainly environmental. Nowadays, it is possible to find numerous research papers devoted to the synthesis characterization and applications of novel precursors to produce activated carbon. Hence, special attention must be given to the relationship among the selected precursor characteristics, the final microstructure and properties of carbon. The present work provides a summary of research works outlining the use of lignocellulosic–based precursors to obtain activated carbons. A brief description of the characterization techniques for both, the precursors and activated carbons, comprising: physicochemical, micro/nanostructural, surface chemistry, textural and adsorption capacity features is presented. Finally, the application of these materials in adsorption of heavy metals, dyes, volatile organic compounds, gas storage and electrochemical capacitors is also included.

566 citations

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TL;DR: It is reported that high surface area of up to 3,022 m2 g−1 can be achieved for hollow carbon nanospheres with an outer diameter of 69 nm by a simple carbonization procedure with carefully selected carbon precursors and carbonization conditions.
Abstract: Well-defined, large surface area nanostructures are promising functional materials but can be difficult to fabricate. Here the authors show how to prepare ultrahigh-surface-area hollow carbon nanospheres, via a controlled carbonization route, and assess their organic vapour adsorption and electrochemical performance.

562 citations