Abstract
This paper explored the method of combining atom transfer radical polymerization (ATRP) technology and hyperbranched polymer principle to prepare the high capacity chelating resin. First, surface-initiated atom transfer radical polymerization (SI-ATRP) method was used to graft glycidyl methacrylate (GMA) on chloromethylated cross-linked styrene-divinylbenzene resin, and then the novel polyamine chelating resin with a kind of hyperbranched structure was prepared through the amination reaction between amino group of (2-aminoethyl) triamine and epoxy group in GMA. This resin had a selective effect on As(V) and Cr(VI) at a relatively low pH and can be used for the disposal of waste water containing As(V) and Cr(VI). It had a relatively strong adsorption effect on Cu(II), Pb(II), Cd(II) and Cr(III) and can be used for the disposal of heavy metal ion waste water. The finding was that, the adsorption capacity of resin on the studied heavy metal ions was higher than that of the chelating resin synthesized by traditional technology and also higher than that of the resin modified by ATRP technology and bifunctional chelator, indicating that the combination of ATRP and hyperbranched polymer concept is an effective method to prepare chelating resin with high capacity.
Highlights
As amino has strong chelating performance on transition metal ions, the adsorbent with amino as the functional group is widely applicable to the removal of heavy metal ions in solution [1,2,3,4,5,6,7]
The first step was to adopt the surface-initiated atom transfer radical polymerization to graft the glycidyl methacrylate (GMA) onto the resin surface, and introduce the epoxy group
All these results indicated that GMA was successfully grafted onto the polystyrene resin through the surface-initiated atom transfer radical polymerization, and the amino group was successfully introduced into the molecular chain through the ring opening reaction between amino and epoxy groups
Summary
As amino has strong chelating performance on transition metal ions, the adsorbent with amino as the functional group is widely applicable to the removal of heavy metal ions in solution [1,2,3,4,5,6,7]. Base (HSAB), Lam et al [8] studied the adsorption selectivity of MCM-41 adsorbent (NH2-MCM-41) on Ag+ and Cu2+; by comparing the distribution coefficients (Kd) of heavy ions in amino-functional activated carbon (NH2-AC), Yantasee et al [9] investigated the adsorption selectivity of NH2-AC on four kinds of heavy metal ions. Hyperbranched polymer is a type of highly irregular multi-level branched polymers with threedimensional spherical structures and rich terminal groups attached at the end of the polymer [13,14,15] This terminal group can serve as a functional group or chelation group for further reaction to provide a possibility for the increase of active groups on the polymer surface [16,17]. SI-ATRP was used to graft the GMA onto the surface of CMPS resin, the cycle addition reaction was performed through the amino in tris(aminoethyl)amine and the epoxy group in GMA to prepare the polyamine chelating resin with hyperbranched structures, and its adsorption performance on the As(V), Cr(VI), Cu(II), Pb(II), Cd(II) and Cr(III) in solution was investigated
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