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Title: Equilibrium and kinetics of metal ion adsorption onto a commercial H-type granular activated carbon: Experimental and modeling studies
Authors: Paul Chen, J. 
Lin, M.
Keywords: Equilibrium
H-type granular activated carbon
Single- and multi-species metal adsorption
Issue Date: 2001
Citation: Paul Chen, J.,Lin, M. (2001). Equilibrium and kinetics of metal ion adsorption onto a commercial H-type granular activated carbon: Experimental and modeling studies. Water Research 35 (10) : 2385-2394. ScholarBank@NUS Repository.
Abstract: Systematic studies on metal ion adsorption equilibrium and kinetics by a commercial H-type granular activated carbon were carried out. Titration of the carbon showed that the surface charge density decreased with an increasing pH. Higher copper adsorption was obtained with increasing solution pH and ionic strength. Metal removal was in the descending order: Cu2+>Zn2+≈Co2+. Copper removal was not affected by addition of zinc or cobalt, while copper can reduce both zinc and cobalt removal. Kinetic experiments demonstrated that the copper adsorption rapidly occurred in the first 30-60min and reached the complete removal in 3-5h. Removal of zinc and cobalt was slightly slower than that of copper. It was found that the mass transfer is important in the metal adsorption rate. The surface complex formation model was used successfully to describe the surface change density, as well as the single- and multi-species metal adsorption equilibrium. The copper removal was due to adsorption of Cu2+, CuOH+, and CuCl+, while the zinc and cobalt uptake was due to the formation of surface-metal complexes of SOM2+ and SOMOH+ (M=Zn and Co). It was found that the diffusion-control model well described the adsorption kinetics with various metal ions and pH values. Finally sensitivity analysis on the kinetic model's parameters was carried out. Copyright © 2001 Elsevier Science Ltd.
Source Title: Water Research
ISSN: 00431354
DOI: 10.1016/S0043-1354(00)00521-2
Appears in Collections:Staff Publications

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