Adsorption of Zn(II) by crosslinked acrylic copolymers with amine functional groups

Abstract

Adsorption of Zn(II) ions from diluted aqueous solutions by the acrylic copolymer based on ethylacrylate : acrylonitrile : divinylbenzene matrix with different crosslinking degrees and ethylenediamine and triethylenetetramine functional groups was investigated. Adsorption experiments were carried out by batch method. The effects of the pH, initial concentration of zinc, time of contact, and the crosslinking degree of the copolymers were studied. On the basis of Langmuir and Freundlich isotherms, the parameters that characterize the adsorption were determined. The maximum Zn(II) retention capacity value (500 mg g Ϫ1 ) was obtained for the acrylic copolymer with 2% crosslinking degree and ethylenediamine, as functional groups.

Preparation, characterization, and Zn2+ adsorption behavior of chemically modified MCM-41 with 5-mercapto-1-methyltetrazole

“…The binding rate gradually decreases and becomes almost constant after an optimum period of 2 h. The reasonably fast kinetics of the matrix-metal ion interaction reflect the good accessibility of the chelating sites of the modified matrix and high binding constants of Zn(II) with the immobilized MTTZ on the silica surface. In addition, these high uptake rates represent significant advances to those reported earlier for other adsorbents [40][41][42]. In order to determine the pH effect on the adsorption capacity of MTTZ-MCM-41, solutions were prepared at different pH levels ranging from 2 to 10.…”

“…By using other reagents (EDTA, thiourea, etc.) nonreproducible results were obtained because these compounds are adsorbed on the silica surface [41]. In the experiment carried out, the adsorption was quantitative for 1000 ml of 1.53 × 10 −4 mM of Zn(II) solution and adsorbed ions were eluted out by 10 ml of 1 M HCl.…”

Adsorption of Cr(VI) onto PEI immobilized acrylate-based magnetic beads: Isotherms, kinetics and thermodynamics study

“…The need of more selective system for separation of metal ions has been increased the development of the synthesis of new adsorbents [12,13]. The acrylic-based adsorbents are almost ideal ones to perform for removal of toxic heavy metals, very stable in a range of buffers from pH 1.0 to 11.0 and were resistant to microbial degradation and several chemicals [9,[11][12][13][14][15]. In addition, magnetic separation technique, using magnetic polymeric particles, is quick and easy method for sensitive and reliable capture of inorganic or organic pollutants.…”

Development of Polymeric and Polymer‐Based Hybrid Adsorbents for Chromium Removal from Aqueous Solution

“…The most commonly applied treatment methods for removing metal ions from wastewaters include adsorption [5][6][7], biosorption [8][9][10][11], chemical precipitation [12], reverse osmosis [13], reduction [14], solvent extraction [15], ion exchange [16,17], filtration, and membrane processes [18,19]. Among them, ion exchange is one of the most popular methods for the removal of chromium ion from wastewaters.…”