Article

Consequence of chitosan treating on the adsorption of humic acid by granular activated carbon.

Department of Textile Engineering, University of Guilan, Rasht, Iran.
Journal of hazardous materials (impact factor: 4.14). 07/2011; 191(1-3):380-7. DOI:10.1016/j.jhazmat.2011.04.096 pp.380-7
Source: PubMed

ABSTRACT In this work, equilibrium and kinetic adsorption of humic acid (HA) onto chitosan treated granular activated carbon (MGAC) has been investigated and compared to the granular activated carbon (GAC). The adsorption equilibrium data showed that adsorption behaviour of HA could be described reasonably well by Langmuir adsorption isotherm for GAC and Freundlich adsorption isotherm for MGAC. It was shown that pre-adsorption of chitosan onto the surface of GAC improved the adsorption capacity of HA changing the predominant adsorption mechanism. Monolayer capacities for the adsorption of HA onto GAC and MGAC were calculated 55.8 mg/g and 71.4 mg/g, respectively. Kinetic studies showed that film diffusion and intra-particle diffusion were simultaneously operating during the adsorption process for MGAC.

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Keywords

adsorption
 
adsorption behaviour
 
adsorption capacity
 
adsorption equilibrium data
 
adsorption process
 
chitosan
 
film diffusion
 
Freundlich adsorption isotherm
 
GAC
 
granular activated carbon
 
humic acid
 
intra-particle diffusion
 
kinetic adsorption
 
Kinetic studies
 
Langmuir adsorption isotherm
 
MGAC
 
Monolayer capacities
 
pre-adsorption
 
predominant adsorption mechanism