Abstract
In the endeavor to explore more and more materials, this work is focused on the study of the potential applicability of a chelating sorbent based on an acrylic copolymer functionalized with amidoethylenamine groups in Cu(II) removal from wastewaters in batch and dynamic conditions. The proposed sorbent was synthesized by the chemical transformation reaction of ethylacrylate (EA): acrylonitrile (AN):2% divinylbenzene (DVB) copolymer with ethylenediamine (EDA). Batch sorption results pointed out that the Cu(II) retention by the acrylic copolymer functionalized with amidoethylen-amine groups was dependent on the initial solution pH, initial metal concentration and contact time. The sorption of Cu (II) on the tested chelating copolymer obeyed both Langmuir and Freundlich isotherms. The Langmuir maximum sorption capacity was 65.21mg Cu (II)/g of polymer. The kinetic experimental data fitted well with the pseudo - second order model. The dynamic behavior of a fixed bed column filled with the acrylic copolymer functionalized with amidoethylenamine groups has been studied in terms of breakthrough curve. The experimental breakthrough data have been well described by Thomas model. The tested chelating copolymer is suitable for multiple processes of Cu(II) sorption-desorption. The column studies with real wastewater sample presented a removal efficiency of 100% for Cu (II) and a significant improvement of the wastewater quality. The acrylic copolymer functionalized with amidoethyleneamine groups can be successfuly applied for the Cu (II) removal - recovery - recycling.
Highlights
Copper, found in the fourth period of the periodic table is, at the same, an essential element and one of the most valuable metal with many and varied industrial applications [1,2]
In the endeavor to explore more and more materials, this work is focused on the study of the potential applicability of a chelating sorbent based on an acrylic copolymer functionalized with amidoethylenamine groups in Cu(II) removal from wastewaters in batch and dynamic conditions
Batch sorption results pointed out that the Cu(II) retention by the acrylic copolymer functionalized with amidoethylenamine groups was dependent on the initial solution pH, initial metal concentration and contact time
Summary
Found in the fourth period (group 11) of the periodic table is, at the same, an essential element and one of the most valuable metal with many and varied industrial applications [1,2]. Its strong toxicity, manifested even at low concentrations, strictly demands that the discharge of the in-dustrial wastewaters contaminated with copper in environment be preceded by applying of a proper treatment method for copper removal, such as: chemical precipitation, coagulation/ flocculation, ion exchange, cementation, membrane separation, reverse osmosis, electroflotation, sorption [3 - 5]. Amongst all the explored sorption materials, the chelating sorbents made up of a polymer network (support) carrying functional groups, capable of sequestering metal ions by coordinative bonds, are distinguished mainly by their broad spectrum of structures and physicochemical features, large uptake capacity, favorable sorption rate, important selectivity for different concentrations, reusability, adjustability of the surface chemistry and tolerance for a wide range of wastewater parameters [7].
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