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Non-destructive separation of metal ions from wastewater containing excess aminopolycarboxylate chelant in solution with an ion-selective immobilized macrocyclic material.
- Source :
-
Chemosphere [Chemosphere] 2010 Mar; Vol. 79 (2), pp. 193-8. Date of Electronic Publication: 2010 Feb 26. - Publication Year :
- 2010
-
Abstract
- Although the excellent metal-binding capacities of aminopolycarboxylate chelants (APCs) facilitate their extensive use, pre- and post-toxicity of APCs and their high persistence in aquatic environments evoke concerns. Several treatment techniques with a principal focus on the degradation of APCs at the pre-release step have been proposed. Here, we report a technique for the separation of metal ions from waste solution containing excess APCs using a solid phase extraction system with an ion-selective immobilized macrocyclic material, commonly known as a molecular recognition technology (MRT) gel. Synthetic metal solutions with 100-fold chelant content housed in H2O matrices were used as samples. The MRT gel showed a higher recovery rate compared with other SPE materials at 20 degrees C using a flow rate of 0.2 mL min(-1). The effects of solution pH, metal-chelant stability constants and ionic radii were assessed for 32 metals. Compared to the conventional treatment options for such waste solutions, our proposed technique has the advantage of non-destructive separation of both metal ions and chelants.<br /> (2010 Elsevier Ltd. All rights reserved.)
- Subjects :
- Cations analysis
Cations chemistry
Edetic Acid chemistry
Metals analysis
Nitrilotriacetic Acid chemistry
Pentetic Acid analogs & derivatives
Pentetic Acid chemistry
Water Pollutants, Chemical analysis
Chelating Agents chemistry
Macrocyclic Compounds chemistry
Metals chemistry
Waste Disposal, Fluid methods
Water Pollutants, Chemical chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1298
- Volume :
- 79
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 20189216
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2010.01.065