Abstract
The surface-initiated atom transfer radical polymerization method was used to graft glycidyl methacrylate (GMA) on chloromethylated cross-linked styrene-divinylbenzene resin, and then the novel diethylenetriamine-functionalized resin was prepared through the amination reaction between amino group of diethylenetriamine and epoxy group in GMA. The adsorption properties were evaluated with As(V). The adsorption of As(V) was mainly regarded as the electrostatic interaction between the adsorbent and the adsorbate by analysing the relationship between adsorption capacity with the solution pH, adsorption isotherm and adsorption kinetics. The maximum sorption capacity of As(V) was 5.25 mmol g−1. The adsorption isotherms of As(V) were best described by the Langmuir model, and its adsorption kinetics followed the pseudo-second-order kinetic equation. The adsorption of As(V) ions was hardly affected by common coexisting ions such as Na(I), K(I), Ca(II) and Mg(II), whereas it was slightly decreased when Fe(II) and Zn(II) coexisted in the solution, which illustrates the selective adsorption of As(V) from wastewater. Ten adsorption–desorption cycles demonstrated that the resin possessed high recycling efficiency and stability and was suitable for efficient removal of metal ions from aqueous solution.
Highlights
Heavy metal pollution is one of the most important environmental problems today
PGMA was grafted onto the surface of CMPS beads by SI-atom transfer radical polymerization (ATRP)
The peak at 532.5 eV is due to O 1s, suggesting that the glycidyl methacrylate (GMA) is introduced into surface of the resin via surfaceinitiated ATRP (SI-ATRP); after ring-opening reaction, the appearance of the peak of N 1s at 396.4 eV shows that the diethylenetriamine has been successfully rsos.royalsocietypublishing.org R
Summary
Heavy metal pollution is one of the most important environmental problems today. Chelating resin, a kind of. Some low-molecular-weight chemicals are often used to functionalize the material surface, but the adsorption capacity is not very satisfactory due to the limited adsorption sites on the material surface This results in a low process economy for the removal of heavy metal ions. There are several methods for preparing grafting polymers, such as the chemisorption of a reactive polymer end group to the surface [11], grafting a polymer chain through a monomer covalently linked to the surface [12] and grafting a polymer chain from a surface modified with polymerization initiators [13]. The adsorption performance for As(V) was studied, which may provide a sort of efficient adsorbent for the treatment of heavy metal wastewater
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