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
Decorative Composite Layers
Part of the materials used in the chemical industry, metallurgical, machine construction, can be coated, as with time it occurs either a decrease of its properties, or even a process of advanced faulting, because of the...
Siderurgy Slags Recovery in Building Industry
During the metallurgical processes of iron and steel elaboration, besides the basic products, it results a serious of secondary products (wastes) in high quantities but with a high recycle – recovery potential, and their...
The Influence of Both Functioning Time and the Service Temperature on the Mechanic Characteristics and Metallographic Structure of Some Steels
The paper determines the influence of both functioning time and the service temperature on mechanic characteristics of 12H1MF steel. In this purpose, the results of mechanical tests, performed at temperatures ranging fro...
Profilometric Analysis of Worn Surface of Bronze, Iron and Iron Composite Samples, by Pin-on-Disk Method
In this study are presented the results of profilometric analysis for the wear of bronze materials, cast iron and composite materials. These materials were tested under dry wear conditions, using "pin-on-disk" method on...
Opportunities to Analyse the Pollution in Metallurgical Industry
The metallurgical industry is a highly polluting economic sector. In order to establish measures to minimise the pollution, new methods are needed to analyse such processes. This article analyses the following possibilit...