NDLI: Modeling of single and competitive adsorption of cadmium and zinc onto activated carbon

Content Provider	Springer Nature Link
Author	Erto, A. Di Natale, F. Musmarra, D. Lancia, A.
Copyright Year	2015
Abstract	This paper describes an experimental and modeling analysis of cadmium and zinc adsorption from aqueous solutions in single and binary systems on activated carbon. Batch tests were performed at constant pH (6.8 ± 0.3) and temperature (20 °C), in order to assess the adsorption capacity in experimental conditions simulating real wastewater. In particular, binary tests were carried out at same pH and temperature, with different initial concentration ratios of the two analytes ( $$C_{Zn}^{0}$$ : $$C_{Cd}^{0}$$ ), in order to emphasize the competition phenomena while minimizing the effect of pH. Experimental results indicate that zinc is adsorbed to a greater extent than cadmium, both in single and binary systems. In binary systems, zinc adsorption capacity is not influenced by the presence of cadmium, regardless of its concentration. On the contrary, an increase in zinc concentration in solution brings about a decrease in cadmium adsorption capacity. The experiments were interpreted by using both the rigorous and the extended Langmuir multicomponent adsorption isotherms and the Vacancy Solution Theory. The latter provided a satisfactory and simultaneous description of the experimental data for both zinc and cadmium adsorption, also accounting for the possible interactions between the two analytes and between the solvent (water) and the single analyte.
Starting Page	611
Ending Page	621
Page Count	11
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	21
Issue Number	8
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2015-11-07
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Activated carbon Heavy metals Cadmium Langmuir Adsorption models Competitive adsorption Industrial Chemistry/Chemical Engineering Surfaces and Interfaces, Thin Films Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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