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224 results on '"Gómez-Serrano, V."'

1. Surface chemistry of cherry stone-derived activated carbon prepared by H3PO4 activation

Author

González Domínguez, José Miguel [0000-0002-0701-7695], González Domínguez, José Miguel, Fernández-González, C., Alexandre-Franco, M., Gómez-Serrano, V., González Domínguez, José Miguel [0000-0002-0701-7695], González Domínguez, José Miguel, Fernández-González, C., Alexandre-Franco, M., and Gómez-Serrano, V.

Abstract

The preparation of activated carbons (ACs) from cherry stones and chemical activation with H3PO4 can be controlled by the experimental variables during the impregnation step in order to obtain a tailored porous structure of the as-prepared ACs. This control not only extends to the ACs’ texture and porosity development, but also to the chemical nature of their surface. The spectroscopic and elemental characterization of different series of ACs is presented in this study. The spectroscopic band features and assignments strongly depend on the H3PO4 concentration and/or the semi-carbonization treatments applied to the feedstock before impregnation, which ultimately influence different characteristics such as the AC hydrophilicity. Different surface chemistries arise from the different tailored impregnation solutions, showing a practical outcome for future applications of the as-prepared ACs.

Published
2024

38. How does phosphoric acid interact with cherry stones? A discussion on overlooked aspects of chemical activation

Author

European Commission, Junta de Extremadura, González Domínguez, José Miguel [0000-0002-0701-7695], González Domínguez, José Miguel, Fernández-González, C., Alexandre-Franco, M., Gómez-Serrano, V., European Commission, Junta de Extremadura, González Domínguez, José Miguel [0000-0002-0701-7695], González Domínguez, José Miguel, Fernández-González, C., Alexandre-Franco, M., and Gómez-Serrano, V.

Abstract

The fabrication of activated carbon (AC) is widely carried out by the so-called chemical activation method, in which the biomass substratum is put in touch with an impregnating chemical agent prior to the carbonization stage. Even though this methodology is known for a long time, there are many features that are still poorly understood, particularly those regarding the details of the underlying mechanisms involved during the interaction of the activating agent with the precursor, eventually leading to the development of AC. Previous research conducted in the laboratories dealt with the use of cherry stones (CS) and phosphoric acid, toward ACs with tailored porous structures, finding out that the experimental variables of the impregnation stage were crucial for their eventual characteristics. Thus, the results obtained at that time deserved further discussion, with the aim at unraveling the true nature of those findings. With such purpose, the authors comment further on the CS and H3PO4 in non-conventional impregnation methodologies, performed in the previous works. Four series of H3PO4-impregnated products were prepared in a previous research, using a wide range of impregnation strategies, aiming at controlling the loading of H3PO4 on the lignocellulosic substratum. Herein, with the mass uptake as the main, it was possible to link the uptake with the chemical changes of H3PO4 in agreement with essential chemistry knowledge. Mass gain is strongly dependent on the impregnation method, and interesting insights arise on the basis of the mass changes of CS after impregnation.

Published
2018

43. Activated carbon from cherry stones by chemical activation. Influence of the impregnation method on porous structure

Author

Junta de Extremadura, European Commission, González Domínguez, José Miguel, Alexandre-Franco, M., Fernández-González, C., Ansón Casaos, Alejandro, Gómez-Serrano, V., Junta de Extremadura, European Commission, González Domínguez, José Miguel, Alexandre-Franco, M., Fernández-González, C., Ansón Casaos, Alejandro, and Gómez-Serrano, V.

Abstract

Cherry stones are utilized as a precursor for the preparation of activated carbons by chemical activation with phosphoric acid (H3PO4). The activation process typically consists of successive impregnation, carbonization and washing stages. Here, several impregnation variables are comprehensively studied, including H3PO4 concentration, number of soaking steps, H3PO4 recycling, washing of the impregnated material, and previous semi-carbonization. The choice of a suitable impregnation methodology opens up additional possibilities for the preparation of a wide variety of activated carbons with high yields and tailored porous structures. Microporous activated carbons with specific surface areas of ~800 m2 g-1 are produced, in which > 60% of the total pore volume is due to micropores. High surface areas of ~1500 m2 g-1 can be also developed, with micropore volumes being a 26% of the total pore volume. Interestingly, using the same amount of H3PO4, either carbons with surface areas of 791 and 337 m2 g-1 or only one carbon with a surface area of 640 m2 g-1 can be prepared. The pore volumes range very widely between 0.07-0.55, 0.01-0.90 and 0.09-0.79 cm3 g-1 for micro-, meso- and macropores, respectively.

Published
2016

47. Preparación de adsorbentes carbonosos a partir de goma de neumáticos

Author

Alexandre-Franco, M., Fernández-González, C., Alfaro-Domínguez, M., and Gómez-Serrano, V.

Subjects
Reciclaje, Adsorbents, Neumáticos, Adsorbentes
Abstract

[ES] En vista de la composición química de los neumáticos fuera de uso es evidente la existencia de distintas posibilidades de reciclado y valorización. Una de las más factibles tal vez sea la pirolisis, que podría permitir el aprovechamiento integral de todas las fracciones resultantes., Los autores del presente trabajo agradecen a los Ministerios de Educación y Ciencia y de Ciencia e Innovación la concesión de los proyectos CTN2005- 08100 y CTM2008-03626, que han hecho posible su realización.

Published
2011

49. Activated carbon from cherry stones by chemical activation: Influence of the impregnation method on porous structure.

Author

González-Domínguez, J. M., Alexandre-Franco, M., Fernández-González, C., Ansón-Casaos, A., and Gómez-Serrano, V.

Subjects
ACTIVATED carbon, CHERRIES, ACTIVATION (Chemistry), ARTIFICIAL insemination, POROUS materials
Abstract

Cherry stones are utilized as a precursor for the preparation of activated carbons by chemical activation with phosphoric acid (H3PO4). The activation process typically consists of successive impregnation, carbonization, and washing stages. Here, several impregnation variables are comprehensively studied, including H3PO4concentration, number of soaking steps, H3PO4recycling, washing of the impregnated material, and previous semi-carbonization. The choice of a suitable impregnation methodology opens up additional possibilities for the preparation of a wide variety of activated carbons with high yields and tailored porous structures. Microporous activated carbons with specific surface areas of ∼800 m2 g−1are produced, in which > 60% of the total pore volume is due to micropores. High surface areas of ∼1500 m2 g−1can be also developed, with micropore volumes being a 26% of the total pore volume. Interestingly, using the same amount of H3PO4, either carbons with surface areas of 791 and 337 m2 g−1or only one carbon with a surface area of 640 m2g−1can be prepared. The pore volumes range very widely between 0.07–0.55, 0.01–0.90, and 0.09–0.79 cm3 g−1for micropores, mesopores, and macropores, respectively. [ABSTRACT FROM AUTHOR]

Published
2017
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