Effect of microporosity and oxygen surface groups of activated carbon in the adsorption of molecules of different polarity

1992 ◽  
Vol 96 (6) ◽  
pp. 2707-2713 ◽  
Author(s):  
F. Rodriguez-Reinoso ◽  
M. Molina-Sabio ◽  
M. A. Munecas
Keyword(s):  
Activated Carbon ◽  
Surface Groups ◽  
Oxygen Surface

scholarly journals Thermal Modification Effect on Supported Cu-Based Activated Carbon Catalyst in Hydrogenolysis of Glycerol

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 603 ◽  
Author(s):  
Juan Seguel ◽  
Rafael García ◽  
Ricardo José Chimentão ◽  
José Luis García-Fierro ◽  
I. Tyrone Ghampson ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Hydrogen Adsorption ◽  
Carbon Support ◽  
Catalytic Performance ◽  
Homogeneous Distribution ◽  
Surface Groups ◽  
Carbon Supports ◽  
Surface Areas ◽  
Oxygen Surface

Glycerol hydrogenolysis to 1,2-propanediol (1,2-PDO) was performed over activated carbon supported copper-based catalysts. The catalysts were prepared by impregnation using a pristine carbon support and thermally-treated carbon supports (450, 600, 750, and 1000 °C). The final hydrogen adsorption capacity, porous structure, and total acidity of the catalysts were found to be important descriptors to understand catalytic performance. Oxygen surface groups on the support controlled copper dispersion by modifying acidic and adsorption properties. The amount of oxygen species of thermally modified carbon supports was also found to be a function of its specific surface area. Carbon supports with high specific surface areas contained large amount of oxygen surface species, inducing homogeneous distribution of Cu species on the carbon support during impregnation. The oxygen surface groups likely acted as anchorage centers, whereby the more stable oxygen surface groups after the reduction treatment produced an increase in the interaction of the copper species with the carbon support, and determined catalytic performances.

Gas phase hydrogenation of crotonaldehyde over Pt/Activated carbon catalysts. Influence of the oxygen surface groups on the support

1997 ◽  
Vol 150 (1) ◽  
pp. 165-183 ◽  
Author(s):  
F. Coloma ◽  
A. Sepúlveda-Escribano ◽  
J.L.G. Fierro ◽  
F. Rodríguez-Reinoso
Keyword(s):  
Activated Carbon ◽  
Gas Phase ◽  
Surface Groups ◽  
Carbon Catalysts ◽  
Oxygen Surface

Oxygen surface groups of activated carbon steer the chemoselective hydrogenation of substituted nitroarenes over nickel nanoparticles

2017 ◽  
Vol 53 (12) ◽  
pp. 1969-1972 ◽  
Author(s):  
Yujing Ren ◽  
Haisheng Wei ◽  
Guangzhao Yin ◽  
Leilei Zhang ◽  
Aiqin Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Activity ◽  
Nickel Catalyst ◽  
Nickel Nanoparticles ◽  
Surface Groups ◽  
Reaction Conditions ◽  
Supported Nickel Catalyst ◽  
Chemoselective Hydrogenation ◽  
Oxygen Surface

An activated carbon with OSGs (Oxygen Surface Groups) supported nickel catalyst shows high activity and chemoselectivity for hydrogenation of a variety of substituted nitroarenes under mild reaction conditions.

A quantitative speciation model for the adsorption of organic pollutants on activated carbon

2013 ◽  
Vol 68 (6) ◽  
pp. 1370-1376 ◽  
Author(s):  
M. Grivé ◽  
D. García ◽  
C. Domènech ◽  
L. Richard ◽  
I. Rojo ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Organic Pollutants ◽  
Current Knowledge ◽  
Quantitative Description ◽  
High Capacity ◽  
Chemical Properties ◽  
Quantitative Model ◽  
Surface Groups ◽  
Potentiometric Titrations ◽  
Chemical Groups

Granular activated carbon (GAC) is commonly used as adsorbent in water treatment plants given its high capacity for retaining organic pollutants in aqueous phase. The current knowledge on GAC behaviour is essentially empirical, and no quantitative description of the chemical relationships between GAC surface groups and pollutants has been proposed. In this paper, we describe a quantitative model for the adsorption of atrazine onto GAC surface. The model is based on results of potentiometric titrations and three types of adsorption experiments which have been carried out in order to determine the nature and distribution of the functional groups on the GAC surface, and evaluate the adsorption characteristics of GAC towards atrazine. Potentiometric titrations have indicated the existence of at least two different families of chemical groups on the GAC surface, including phenolic- and benzoic-type surface groups. Adsorption experiments with atrazine have been satisfactorily modelled with the geochemical code PhreeqC, assuming that atrazine is sorbed onto the GAC surface in equilibrium (log Ks = 5.1 ± 0.5). Independent thermodynamic calculations suggest a possible adsorption of atrazine on a benzoic derivative. The present work opens a new approach for improving the adsorption capabilities of GAC towards organic pollutants by modifying its chemical properties.

scholarly journals Sorption Characteristics of Mixed Molecules of Glutaraldehyde from Water on Mesoporous Acid-Amine Modified Low-Cost Activated Carbon: Mechanism, Isotherm, and Kinetics

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Mukosha Lloyd ◽  
Onyango S. Maurice ◽  
Ochieng Aoyi ◽  
Taile Y. Leswifi
Keyword(s):  
Activated Carbon ◽  
Significant Contribution ◽  
Aldol Condensation ◽  
Low Cost ◽  
Aquatic Toxicity ◽  
Aquatic Organisms ◽  
Surface Groups ◽  
Intraparticle Diffusion Model ◽  
Cooperative Adsorption ◽  
Deactivation Process

The environmental discharge of inefficiently treated waste solutions of the strong biocide glutaraldehyde (GA) from hospitals has potential toxic impact on aquatic organisms. The adsorption characteristics of mixed polarized monomeric and polymeric molecules of GA from water on mesoporous acid-amine modified low-cost activated carbon (AC) were investigated. It was found that the adsorption strongly depended on pH and surface chemistry. In acidic pH, the adsorption mechanism was elaborated to involve chemical sorption of mainly hydroxyl GA monomeric molecules on acidic surface groups, while in alkaline pH, the adsorption was elaborated to involve both chemical and physical sorption of GA polymeric forms having mixed functional groups (aldehyde, carboxyl, and hydroxyl) on acidic and amine surface groups. The optimum pH of adsorption was about 12 with significant contribution by cooperative adsorption, elucidated in terms of hydrogen bonding and aldol condensation. Freundlich and Dubinin-Radushkevich models were fitted to isotherm data. The adsorption kinetics was dependent on initial concentration and temperature and described by the Elovich model. The adsorption was endothermic, while the intraparticle diffusion model suggested significant contribution by film diffusion. The developed low-cost AC could be used to supplement the GA alkaline deactivation process for efficient removal of residual GA aquatic toxicity.

The role of nitrogen and oxygen surface groups in the behavior of carbon-supported iron and ruthenium catalysts

Carbon ◽  
1988 ◽  
Vol 26 (4) ◽  
pp. 417-423 ◽  
Author(s):  
A. Guerrero-Ruiz ◽  
I. Rodriguez-Ramos ◽  
F. Rodriguez-Reinoso ◽  
C. Moreno-Castilla ◽  
J.D. López-González
Keyword(s):  
Ruthenium Catalysts ◽  
Surface Groups ◽  
Oxygen Surface ◽  
Supported Iron

scholarly journals Explaining the interactions between metaldehyde and acidic surface groups of activated carbon under different pH conditions

2019 ◽  
Vol 90 ◽  
pp. 94-103 ◽  
Author(s):  
Anthuan Ferino-Pérez ◽  
Juan José Gamboa-Carballo ◽  
Zhuojun Li ◽  
Luiza C. Campos ◽  
Ulises Jáuregui-Haza
Keyword(s):  
Activated Carbon ◽  
Surface Groups ◽  
Ph Conditions

scholarly journals Carbon nanosphere adsorbents for removal of arsenate and selenate from water

2015 ◽  
Vol 2 (3) ◽  
pp. 245-250 ◽  
Author(s):  
Man Li ◽  
Chengwei Wang ◽  
Michael J. O'Connell ◽  
Candace K. Chan
Keyword(s):  
Activated Carbon ◽  
Spray Pyrolysis ◽  
High Surface ◽  
Volume Ratio ◽  
Spray Pyrolysis Method ◽  
Surface Groups ◽  
Microporous Structure ◽  
Carbon Nanospheres ◽  
Pyrolysis Method

Carbon nanospheres prepared using a facile spray pyrolysis method display good adsorption to arsenate and selenate compared to commercial activated carbon, due to the presence of basic surface groups, high surface-to-volume ratio, and suitable microporous structure.

Effects of ageing on the oxygen surface complexes of an oxidized activated carbon

1996 ◽  
Vol 92 (15) ◽  
pp. 2779-2782 ◽  
Author(s):  
Francisco Carrasco-Marín ◽  
José Rivera-Utrilla ◽  
Jean-Pierre Joly ◽  
Carlos Moreno-Castilla
Keyword(s):  
Activated Carbon ◽  
Surface Complexes ◽  
Oxidized Activated Carbon ◽  
Oxygen Surface
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