Abstract
In this research, a series of permanent magnetic anion exchange resins (MAERs) were prepared by polymerizing glycidyl methacrylate monomer and crosslinking diallyl itaconate (DAI) and divinylbenzene. The properties and performances of these novel MAERs were systematically characterized and evaluated for humic acid (HA) adsorption by batch experiments. With the increase of DAI content from 0 to 15%, the moisture of MAERs was elevated from 50.23% to 68.53%, along with the adsorption capacity increasing from 2.57 to 3.14 mmol g−1. As the concentrations of co-existing cation (Ca2+ and Mg2+) increased, the adsorption amounts of HA dropped drastically at first and increased a little at high cation concentrations. Although ion exchange was the primary mechanism for HA adsorption, other physical interactions and electrostatic attraction between HA molecules and newly formed oxonium group also played significant roles for HA adsorption. The MAERs could be efficiently regenerated by a mixture of NaCl/NaOH solution (10%/1%), and notably, the MAER-3 with the highest DAI content displayed unapparent loss of adsorption capacity during twenty-one successive adsorption-desorption cycles. These results suggested a novel resin adsorbent for its excellent performances on adsorption, regeneration, and sedimentation in water treatment for natural organic matter removal.
Highlights
Magnetic resins have been found appealing in a large number of industrial-scale water treatment applications and installed new plants continuously, the magnetic resins still attract less attention than they deserve
The anion exchange capacity (AEC) of magnetic anion exchange resins (MAERs) was affected by the Diallyl itaconate (DAI) content, which is expressed by the content of N element for each resin
For the C1s spectra of humic acid (HA)-loaded MAER-3 at pH 2.0, the contents of O–C=O increased greatly, while the peak corresponding to carbon atoms of –CH2–O– at 285.91 eV shifted to 285.56 eV, indicating that this group played important roles in the HA adsorption
Summary
Itaconate and Its Adsorptive and Received: 4 September 2017 Accepted: 23 November 2017 Published: xx xx xxxx. The MAERs could be efficiently regenerated by a mixture of NaCl/NaOH solution (10%/1%), and notably, the MAER-3 with the highest DAI content displayed unapparent loss of adsorption capacity during twenty-one successive adsorption-desorption cycles These results suggested a novel resin adsorbent for its excellent performances on adsorption, regeneration, and sedimentation in water treatment for natural organic matter removal. Shuang et al.[14] recently developed a novel magnetic anion exchange resin called NDMP, which incorporated with different amount of nanoscale Fe3O4 and exhibited significantly improved adsorption and reusability performances due to its much more enhanced resin hydrophilicity. A series of novel permanent-magnetic anion exchange resins (MAERs) with the different amount of crosslinker DAI in feed compositions were prepared. The resins were separated by a magnet and transferred into another 100 mL untreated solution, which was similar as the former operation run
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