Mechanistic and adsorption equilibrium studies of dibenzothiophene-rich-diesel on MnO2 -loaded-activated carbon: Surface characterization

2017 ◽  
Vol 36 (3) ◽  
pp. 903-913 ◽  
Author(s):  
Mohammad A. Al-Ghouti ◽  
Yahya S. Al-Degs ◽  
Ayman A. Issa ◽  
Ramia Z. Al Bakain ◽  
Majeda A. Khraisheh
Keyword(s):  
Activated Carbon ◽  
Surface Characterization ◽  
Adsorption Equilibrium ◽  
Carbon Surface ◽  
Equilibrium Studies

Adsorption Equilibrium and Kinetics of CO2 and H2O on Activated Carbon

2012 ◽  
Vol 27 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Dong XU ◽  
Jun ZHANG ◽  
Gang LI ◽  
Penny XIAO ◽  
Paul WEBLEY ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Equilibrium ◽  
Equilibrium And Kinetics ◽  
Adsorption Equilibrium And Kinetics ◽  
Kinetics Of

scholarly journals The influence of active carbon contaminants on the ozonation mechanism interpretation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lilla Fijołek ◽  
Joanna Świetlik ◽  
Marcin Frankowski
Keyword(s):  
Activated Carbon ◽  
Active Carbon ◽  
Alkali Metals ◽  
Activated Carbons ◽  
Carbon Surface ◽  
Bulk Solution ◽  
Ozone Decomposition ◽  
Reaction Products ◽  
Treatment Technology ◽  
Carbon Impurities

AbstractIn water treatment technology, activated carbons are used primarily as sorbents to remove organic impurities, mainly natural organic matter, but also as catalysts in the ozonation process. Commercially available activated carbons are usually contaminated with mineral substances, classified into two main groups: alkali metals (Ca, Na, K, Li, Mg) and multivalent metals (Al, Fe, Ti, Si). The presence of impurities on the carbon surface significantly affects the pHpzc values determined for raw and ozonated carbon as well as their acidity and alkalinity. The scale of the observed changes strongly depends on the pH of the ozonated system, which is related to the diffusion of impurities from the carbon to the solution. In an acidic environment (pH 2.5 in this work), the ozone molecule is relatively stable, yet active carbon causes its decomposition. This is the first report that indirectly indicates that contaminants on the surface of activated carbon (multivalent elements) contribute to the breakdown of ozone towards radicals, while the process of ozone decomposition by purified carbons does not follow the radical path in bulk solution. Carbon impurities also change the distribution of the reaction products formed by organic pollutants ozonation, which additionally confirms the radical process. The study showed that the use of unpurified activated carbon in the ozonation of succinic acid (SA) leads to the formation of a relatively large amount of oxalic acid (OA), which is a product of radical SA degradation. On the other hand, in solutions with purified carbon, the amount of OA generated is negligible.

Supercritical CO2 regeneration of activated carbon loaded with organic adsorbates

1997 ◽  
Vol 35 (7) ◽  
pp. 261-268 ◽  
Author(s):  
Kazuyuki Chihara ◽  
Kanji Oomori ◽  
Takao Oono ◽  
Yosuke Mochizuki
Keyword(s):  
Activated Carbon ◽  
Cost Estimation ◽  
Supercritical Co2 ◽  
Adsorption Equilibrium ◽  
Equilibrium Constants ◽  
Adsorption Dynamics ◽  
Boiling Points ◽  
Organic Adsorbates ◽  
Carbon Regeneration ◽  
Co2 Density

Supercritical CO2 regeneration is one of the possibilities for spent carbon regeneration loaded with some organics. Here, adsorption equilibrium and adsorption dynamics were evaluated for some typical organic pollutants under some supercritical CO2 conditions. A supercritical CO2 chromatograph packed with activated carbon (F-400, CAL) was used to detect the pulse responses of organics, which were analyzed by moment analysis. Adsorption equilibrium constants of some organics varied with CO2 density and their boiling points. Possibility of regeneration of each substance was discussed. Cost estimation was necessary and was the key point of this technique.

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