Influence of Acidic Groups of Activated Carbon on Adsorption and Desorption of Cadmium Ions

Autor:	Kazuya Yoshihara, Motoi Machida, Yoko Fujimura, Masami Aikawa, Hideki Tatsumoto
Rok vydání:	2007
Předmět:	Cadmium Langmuir Aqueous solution Inorganic chemistry Kinetics chemistry.chemical_element chemistry.chemical_compound Adsorption chemistry Nitric acid Desorption medicine Activated carbon medicine.drug
Zdroj:	Journal of Environmental Chemistry. 17:635-641
ISSN:	1882-5818 0917-2408
DOI:	10.5985/jec.17.635
Popis:	The adsorptions of cadmium ions from aqueous solutions on the two kinds of coal based activated carbons (AC's) oxidized (incorporating acidic functional groups by nitric acid treatment) and out-gassed (removing acidic functional groups by heating in reduction condition) were examined. Cadmium adsorption affinity onto the oxidized AC is larger than that to the out-gassed AC, and the equivalent amount of proton for cadmium adsorption was released from oxidized AC. The adsorption kinetic of cadmium onto out-gassed AC could be predicted by Langmuir type kinetic equation, but it was slower than the predicted value in approaching the equilibrium state for the oxidized AC. Based on adsorption kinetics for oxidized AC in acidic solution, the slower kinetics were supposed to be influenced by proton released with adsorption. Since Langmuir type kinetic equation is assumed the collision to the adsorption site, the adsorption process is predominated by collision to the adsorption site in both of the activated carbons.
Databáze:	OpenAIRE
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