Heavy Metal Ions Cu (II), Co (II) and Cr (III) Bifunctionally Improved with Hydroxamic and Amidoxime Groups Chelating Ion Exchangers
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2009, Vol 32, Issue 1
Abstract
Two new types of bifunctional chelating ion exchangers on the basis of ethylacrylate acrylonitrile: divinylbenzene copolymers with hydroxamic acid and amidoxime groups have been evaluated for Cu(II), Co(II) and Cr(III)ions sorption from unbuffered diluted aqueous solutions. To model the retention and to compare the sorption capacity of bifunctional acrylic chelating sorbents for the tested cations the Langmuir and Freundlich isotherm equations have been used. The Langmuir maximum sorption capacities for the sorbent of type A were determined to be 2.081, 1.423 and 1.384 mmole/g for Cu (II), Co (II) and Cr (III), respectively. The increase of cross- linking degree for the bifunctional chelating ion exchanger of type B resulted in the decrease of its sorption capacity toward heavy metal ions under study. The negative values of ΔG in all cases point to the spontaneous character of the sorption process. The kinetics of the Cu (II), Co (II) and Cr (III) sorption follows the Lagergren pseudo – first order model. The results are significant for the future development of the tested sorbents into beneficial materials for industrial and environmental applications.
Authors and Affiliations
R. WENKERT, S. MOISA, L. TOFAN, C. PADURARU
Keywords
Related Articles
- EP ID EP657203
- DOI -
- Views 75
- Downloads 0
Consideration Regarding the Heat Treatment of Sheets and Strips from Aluminum Alloy 5052 Type
The paper extends the laboratory investigations performed on samples taken from industrial production to the current technologies, the solutions proposed forming a fundamental change in the thermal treatment regimes by v...
Energy Disequilibrium Effects in Heat Treatment Equipment
The differences found between heat fluxes in different areas of the heat treatment equipment workspace, due to energy disequilibrium or due to improper positioning of loading, can cause non-uniform temperatures and heat...
Quality Surface Analysis for Polarized Grid Plasma Nitridings
For the study regarding the effect of the polarized grid a prototype plasma nitriding facility was used. A polarized grid was placed inside the working chamber, into the space between the anode and cathode, a negative po...
The Analysis of the Breaking Susceptibility of Some Feritic Stainless Steel
The growth of the world stainless steel conumption was the result of some new domains development, of some demands and special conditions undercooling not only the adaptability of this alloy but also the remarcable range...
Energetic and Exergetic Efficiencies of Biomass Gasification Processes
A promising way to use biomass for the production of heat, electricity and other biofuels is through biomass gasification. In the gasification process, the chemical energy of the solid fuel is converted into the chemical...