Removal of Cadmium Using Electrochemically Oxidized Activated Carbon

2000 ◽  
Vol 78 (2) ◽  
pp. 143-148 ◽  
Author(s):  
J.R. Rangel-Mendez ◽  
M.H. Tai ◽  
M. Streat
Keyword(s):  
Activated Carbon ◽  
Oxidized Activated Carbon

The Study on Moisture Adsorption of Oxidized Activated Carbon

2012 ◽  
Vol 581-582 ◽  
pp. 233-237
Author(s):  
Kang Wang ◽  
Wei Long Wang ◽  
Jian Feng Lu ◽  
Jing Ding
Keyword(s):  
Activated Carbon ◽  
Water Vapor ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Room Temperature ◽  
Specific Area ◽  
Water Vapor Adsorption ◽  
Clean Coal ◽  
Moisture Adsorption ◽  
Oxidized Activated Carbon

Activated carbon made by clean coal and 25% coconut shell was selected to be modified with different concentrations’ HNO3. The productions were characterized by BET, XPS, FTIR and the moisture adsorption of performance is investigated by the DVSA-STD dynamic vapor analyzer. The results show that specific surface area of the activated carbon modified by the 10% concentration of HNO3 is improved 1.3 times than the unmodified one. By comparison the higher concentrations of HNO3 have weaker effects on the specific area of activated carbon. The water vapor adsorption capacity of activated carbon modified by HNO3 at 10% concentration is 1.5 times higher than the unmodified at room temperature at30% RH.

Adsorption of diclofenac sodium from water using oxidized activated carbon

2016 ◽  
Vol 301 ◽  
pp. 27-34 ◽  
Author(s):  
Biswa Nath Bhadra ◽  
Pill Won Seo ◽  
Sung Hwa Jhung
Keyword(s):  
Activated Carbon ◽  
Diclofenac Sodium ◽  
Oxidized Activated Carbon

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

scholarly journals The interaction of metallic ions onto activated carbon surface using computational chemistry software

2020 ◽  
Vol 38 (5-6) ◽  
pp. 191-204
Author(s):  
AL Paredes-Doig ◽  
A Pinedo-Flores ◽  
J Aylas-Orejón ◽  
D Obregón-Valencia ◽  
MR Sun Kou
Keyword(s):  
Activated Carbon ◽  
Metal Ions ◽  
Electron Density ◽  
Activated Carbons ◽  
Surface Acidity ◽  
Chemical Activation ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Metallic Ions ◽  
Oxidized Activated Carbon

Activated carbon was prepared from the seeds of aguaje palm ( Mauritia flexuosa L.f.) by a chemical activation with phosphoric acid. This activated carbon was used for adsorbing metal ions: Pb(II), Cd(II), and Cr(III). To understand the mechanism of adsorption of these heavy metals (Cr, Cd, and Pb), the activated carbon surface was oxidized with nitric acid (1 M) increasing the oxygenated surface groups showing an increasing in their adsorption capacities of these metals. The oxidized activated carbon slightly increased the maximum adsorption capacity to 5–7%. The order of adsorption for unoxidized and oxidized activated carbons was Pb> Cd> Cr. This experimental information was corroborated by molecular modeling program Hyperchem 8 based adsorption mainly on two factors: the electron density and orbitals—highest occupied molecular orbital and lowest unoccupied molecular orbital.Activated carbons were characterized by adsorption/desorption of N2, obtaining an increase of microporous surface area for oxidized activated carbon. An increase of surface acidity and a reduction of isoelectric points were observed in oxidized activated carbon. According to these results, the adsorption of metal ions is favored in contact with an oxidized activated carbon, which has more amount of phenolic and carboxylic functional groups. Similarly, decreasing the isoelectric point indicates that the surface has a higher negative charge. The surface information was corroborated by Hyperchem, which indicates that the surface of the oxidized activated carbon has a higher electron density, indicating a larger amount of electrons on its surface, which means the surface of oxidized activated carbon charges negatively and thereby attracts metal ions.

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