scholarly journals Adsorptive Mechanism on Activated Carbon in the Liquid Phase. III. The Relationship between the Physical Constants of Organic Compounds and Their Adsorbabilities on Activated Carbon from an Aqueous Solution

1980 ◽  
Vol 53 (5) ◽  
pp. 1199-1205 ◽  
Author(s):  
Ikuo Abe ◽  
Katsumi Hayashi ◽  
Mutsuo Kitagawa ◽  
Toshihiro Urahata
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Liquid Phase ◽  
Organic Compounds ◽  
Phase Iii ◽  
Physical Constants ◽  
Adsorptive Mechanism ◽  
The Relationship

scholarly journals Aminated Activated Carbon in Liquid-phase Hydrogenation of Organic Compounds

2020 ◽  
Vol 35 (3) ◽  
pp. 103-110
Author(s):  
N.A. Magdalinova ◽  
◽  
K.M. Puzakova ◽  
M.V. Klyuev ◽  
◽  
...  
Keyword(s):  
Activated Carbon ◽  
Liquid Phase ◽  
Organic Compounds ◽  
Liquid Phase Hydrogenation

Effects of the functional groups attached to aromatic organic compounds on their adsorption onto preloaded activated carbon

2012 ◽  
Vol 66 (8) ◽  
pp. 1799-1805 ◽  
Author(s):  
Lu Zhaoyang ◽  
Jiang Bicun ◽  
Li Aimin
Keyword(s):  
Hydrogen Bonding ◽  
Activated Carbon ◽  
Linear Relationship ◽  
Functional Groups ◽  
Organic Compounds ◽  
Hydrophobic Effect ◽  
Aromatic Stacking ◽  
Micropore Surface Area ◽  
Adsorption Capacities ◽  
The Relationship

The adsorption of phenol, p-nitrophenol, aniline, and nitrobenzene onto a commercial granular activated carbon (GAC: F400) preloaded with tannic acid (TA), a model background contaminant, was investigated. Compared with virgin GAC, the adsorption capacities of the four selected aromatic organic compounds (AOCs) onto GACs preloaded with TA at three densities were affected significantly. Also, the relationship between the adsorption capacities of AOCs and the characteristics of GACs was further discussed and clarified in this manuscript. The differences in the functional groups attached to the AOCs did not affect the similar linear relationship between the micropore surface area and their capacities to AOCs. However, the adsorption capacities of AOCs on TA-loaded GAC were affected by the different functional groups on the four AOCs: 67.6% of the capacity of aniline for virgin F400 remained on F400c (a preloaded GAC), compared with 23.8, 25.9, and 36.5% of phenol, p-nitrophenol, and nitrobenzene, respectively. The diversity of adsorption behavior of the four AOCs with different substituents was the result of hybrid contributions, such as hydrogen bonding, hydrophobic effect and aromatic stacking.

scholarly journals Nitrogen-Doped Carbonaceous Materials for Removal of Phenol from Aqueous Solutions

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Magdalena Hofman ◽  
Robert Pietrzak
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Liquid Phase ◽  
Carbonaceous Material ◽  
Phase Changes ◽  
Waste Materials ◽  
Isotherm Models ◽  
Phenol Content ◽  
Nitrogen Doped ◽  
Adsorption Isotherm Models

Carbonaceous material (brown coal) modified by pyrolysis, activation, and enrichment in nitrogen, with two different factor reagents, have been used as adsorbent of phenol from liquid phase. Changes in the phenol content in the test solutions were monitored after subsequent intervals of adsorption with selected adsorbents prepared from organic materials. Significant effect of nitrogen present in the adsorbent material on its adsorption capacity was noted. Sorption capacity of these selected materials was found to depend on the time of use, their surface area, and pore distribution. A conformation to the most well-known adsorption isotherm models, Langmuir, and Freundlich ones, confirms the formation of mono- and heterolayer solute (phenol) coverage on the surface of the adsorbent applied herein. The materials proposed as adsorbents of the aqueous solution contaminants were proved effective, which means that the waste materials considered are promising activated carbon precursors for liquid phase adsorbents for the environmental protection.

Selective adsorption on fibrous activated carbon of organics from aqueous solution: correlation between adsorption and molecular structure

1997 ◽  
Vol 35 (7) ◽  
pp. 251-259 ◽  
Author(s):  
Catherine Brasquet ◽  
Etienne Subrenat ◽  
Pierre Le Cloirec
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Organic Compounds ◽  
Specific Surface Area ◽  
Selective Adsorption ◽  
Molecular Characteristics ◽  
Pore Size Distributions

In industrial processes, granular activated carbon (GAC) is generally used to remove pollutants from wastewater. Recently, a new adsorbant has been explored, fibrous activated carbon (FAC). Experiments were carried out with two FACs having different specific surface areas (1500 and 1300 m2.g−1) and pore-size distributions to study adsorption of various organic compounds from aqueous solution. Results were compared with adsorption onto one GAC with a specific surface area of about 1000 m2.g−1. Classic models were applied and kinetic constants were computed. In most cases, FAC with the higher specific surface area (named CS 1501) showed better adsorption capacities and kinetics than the two other FACs. For example, adsorption velocity of benzaldehyde was 7.2 ξ 10−5 1.mg−1·min−1 with CS 1501 and about 3 ξ 10−5 1.mg−1.min−1 with other FACs. Furthermore, adsorption onto CS 1501 of a great number of organic compounds (aliphatic and aromatic) depended on solute molecular characteristics. For instance, solute molecular size seemed to play an important role: adsorption capacity of high molecular weight compounds (humic substances) was about 3 mg.g−1, a value much lower than those of low molecular weight compounds, which were respectively 200 mg.g−1 and 400 mg.g−1 for phenol and benzoic acid. From experimental results, a correlation of QSAR (Quantitative Structure-Activity Relationship) type has been set up. This relationship predicts the adsorbability of organics compounds onto fibrous activated carbon from the molecular properties of these compounds.

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