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Your search keyword '"Ghimbeu, Camelia"' showing total 239 results
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239 results on '"Ghimbeu, Camelia"'

1. Physico-chemical properties of hydrochars produced from raw olive pomace using olive mill wastewater as moisture source

Author

Azzaz, Ahmed Amine, Jeguirim, Mejdi, Marks, Evan A. N., Rad, Carlos, Jellali, Salah, Goddard, Mary-Lorène, and Ghimbeu, Camelia Matei

Subjects
Raw olive pomace, Olive mill wastewater, Hydrothermal carbonization, High heating value, Solid characterization, Liquid characterization, Biochemistry, QD415-436, Physical and theoretical chemistry, QD450-801, Mathematics, QA1-939
Abstract

In this study, we assessed the transformation of raw olive pomace into carbon-rich material using olive mill wastewater (OMWW) as the liquid medium for the hydrothermal carbonization (HTC) process. The findings were compared accordingly with the use of distilled water (DW), which is the conventional practice. The use of OMWW as a liquid matrix enhanced the hydrochar yield, but volatile matter, fixed carbon content, and O/C and H/C ratios followed a decreasing trend. Furthermore, for an HTC temperature of 220 °C, the use of OMWW considerably increased the high heating value of the hydrochars from approximately 24.2 MJ/kg to 31.6 MJ/kg. According to the van Krevelen diagram of feedstock and derived hydrochars, dehydration was the predominant carbonization reaction for both liquid sources. Morphological characterization of both sets of hydrochars indicated the generation of specific carbon nuclei when using DW while OMWW led to the creation of hydrochar with a less homogeneous surface. Structural analysis revealed the heterogeneous aspect of the hydrochar surface with an abundance of crystallized metal-based inorganic salts.

Published
2021
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3. On the effect of surface functional groups on the structural and dynamical properties of an ionic liquid confined in zeolite templated carbons studied through molecular simulations

Author

Lahrar, El Hassane, Deroche, Irena, Ghimbeu, Camélia Matei, Simon, Patrice, and Merlet, Céline

Subjects
Condensed Matter - Materials Science
Abstract

Porous carbons are used in a wide range of applications, including electrochemical double layer capacitors for energy storage, in which electrolyte ion properties under confinement are crucial for the performance of the systems. While many synthesis techniques lead to the presence of surface functional groups, their effect on the adsorption and diffusion of electrolyte ions is still poorly understood. In this study we investigate the effect of surface chemistry on dynamical and structural properties of adsorbed ions through molecular dynamics simulations of a neat ionic liquid in contact with several zeolite templated carbons. The steric and specific influence of functional groups is explored using three structures: a structure without any functional groups; a structure with ester, hydroxyl, anhydride acid and carboxyl functional groups; and a structure where the oxygen and hydrogen atoms are replaced by carbon atoms. We show that the functionalization has a limited impact on the structure of the confined electrolyte but affects the diffusion coefficients, and that the relative importance of the structure and chemical nature of the functional groups is not the same depending on the ion type and property considered.

Published
2021

4. Cocoa Pod Husk Carbon Family for Biogas Upgrading: Preliminary Assessment Using the Approximate Adsorption Performance Indicator.

Author

Abou Alfa, Khaled, Meza-Sepulveda, Diana C., Vaulot, Cyril, Le Meins, Jean-Marc, Ghimbeu, Camelia Matei, Tonini, Louise, Cubillos, Janneth A., Moynault, Laurent, Platel, Vincent, Paredes, Diego, and Hort, Cecile

Subjects
GAS absorption & adsorption, ADSORPTION isotherms, GAS mixtures, SEPARATION (Technology), CARBON dioxide, BIOGAS
Abstract

The preliminary selection of adsorbents for the separation of a gas mixture based on pure gas adsorption remains a critical challenge; thus, an approximate adsorption performance indicator (AAPI) was proposed for the initial evaluation of the adsorbents to separate the biogas main constituents (carbon dioxide/methane (CO2/CH4)) by studying their pure gas adsorption. Three samples derived from cocoa pod husk (CPH), namely Cabosse-500 (pyrolyzed at 500 °C), Cabosse-700 (pyrolyzed at 700 °C), and Cabosse-A-700 (activated with CO2 at 700 °C), were synthesized, characterized, and evaluated for the pure gases adsorption. This study presents an AAPI evaluation, which takes into account adsorption capacity, approximate selectivity, and heat of adsorption. Adsorption isotherms indicate the ability of the CPH family to selectively capture CO2 over CH4, as they have a high approximate selectivity (>1) thanks to their physical properties. Changing the pyrolysis temperature, activation methods, and varying the pressure can significantly change the choice of the most effective adsorbent; Cabosse-A-700 showed better performance than the other two in the low and high pressure range owing to its presence of micropores and mesopores, which enhances the CO2 adsorption and therefore the AAPI. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Hydrothermal Carbonization of Olive Pomace Using Olive Mill Wastewater as a Conversion Media

Author

Azzaz, Ahmed Amine, Jeguirim, Mejdi, Ghimbeu, Camélia, Bennici, Simona, Limousy, Lionel, Jellali, Salah, Förstner, Ulrich, Series Editor, Rulkens, Wim H., Series Editor, Salomons, Wim, Series Editor, Ksibi, Mohamed, editor, Ghorbal, Achraf, editor, Chakraborty, Sudip, editor, Chaminé, Helder I., editor, Barbieri, Maurizio, editor, Guerriero, Giulia, editor, Hentati, Olfa, editor, Negm, Abdelazim, editor, Lehmann, Anthony, editor, Römbke, Jörg, editor, Costa Duarte, Armando, editor, Xoplaki, Elena, editor, Khélifi, Nabil, editor, Colinet, Gilles, editor, Miguel Dias, João, editor, Gargouri, Imed, editor, Van Hullebusch, Eric D., editor, Sánchez Cabrero, Benigno, editor, Ferlisi, Settimio, editor, Tizaoui, Chedly, editor, Kallel, Amjad, editor, Rtimi, Sami, editor, Panda, Sandeep, editor, Michaud, Philippe, editor, Sahu, Jaya Narayana, editor, Seffen, Mongi, editor, and Naddeo, Vincenzo, editor

Published
2021
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39. List of contributors

Author

Amiinu, Ibrahim Saana, Andersen, Henrik L., Cai, Xun, Fan, Ling, Feng, Jinkui, Gao, Yueteng, Kang, Feiyu, Larbi, Louiza, Larhrib, Badre, Le Pham, Phuong Nam, Li, Lin, Liu, Pengcheng, Lu, Bingan, Matei-Ghimbeu, Camélia, Monconduit, Laure, Owusu, Kwadwo Asare, Ryan, Kevin M., Sharma, Neeraj, Stievano, Lorenzo, Sun, Litao, Teusner, Matthew, Wei, Tianchen, Wu, Liang, Wu, Yiying, Wu, Yuhan, Wu, Yusheng, Xia, Maoting, Yuan, Xiaomin, Zhai, Dengyun, Zhang, Chenglin, Zhang, Jianwen, Zhou, Lei, Zhou, Min, Zhu, Bo, and Zhu, Yujie

Published
2025
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