Crosslinking induced by irradiation raises selectivity of polymeric adsorbent

Abstract

Amine‐type adsorbents were prepared by radiation‐induced graft polymerization. The sorption behaviors for an individual metal ion of Cu2+ and Pb2+ separately, as well as with mixed Cu2+/Pb2+, were studied in both column and batch mode. Ethylenediamine‐type adsorbent exhibited a high capacity for Cu2+ and Pb2+ at a high flow rate of 1000 h−1, but low selectivity in the mixed Cu2+/Pb2+ solutions. Radiation‐induced crosslinking of the amine‐type adsorbent was performed in water to improve selectivity. Crosslinking of the material was demonstrated by gel fraction, water content, and scanning electron microscopy image. Compared with the results from the noncrosslinked adsorbents, the breakthrough curve of Cu2+ right shifted, whereas the breakthrough curve of Pb2+ left shifted, indicating the higher adsorption capacity of Cu2+ and the lower adsorption capacity of Pb2+ from the crosslinked adsorbent. After 300 kGy irradiation, the crosslinked adsorbent was found to selectively adsorb Cu2+ from the mixed Cu2+/Pb2+ solution. The results revealed that crosslinking raised the selectivity of the adsorbents. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

A novel ion-imprinted amidoxime-functionalized UHMWPE fiber based on radiation-induced crosslinking for selective adsorption of uranium

“…The gel fractions of the bers before and aer ion imprinting were estimated by the swelling ratio through the equilibrium swelling method. 43 The bers were extracted with toluene in a Soxhlet apparatus for 12 h. The gel fraction was dened by eqn (3):…”

“…The four methylene groups of 4HB in the graed chains provide sufficient sites for crosslinking. 43,49 Aer crosslinking, the AO groups in the polymer were rmly xed, and the motion of the graed chains was restrained. 43 In aqueous solution, the chains swell and the rmly xed AO groups can adsorb the template ions of uranyl efficiently.…”

“…43,49 Aer crosslinking, the AO groups in the polymer were rmly xed, and the motion of the graed chains was restrained. 43 In aqueous solution, the chains swell and the rmly xed AO groups can adsorb the template ions of uranyl efficiently. In the dry state of the ber, shrinkage of the chains endows them with numerous pores with diameters of about 200 nm.…”

Green and efficient synthesis of an adsorbent fiber by preirradiation‐induced grafting of PDMAEMA and its Au(III) adsorption and reduction performance

“…In our previous studies, various amine-type adsorbents prepared from RIGP were evaluated for their adsorption of metal ions such as copper, lead, and gold. 19,20 Gold nanostructured microtubes (Au NMTs) were prepared using a tertiary amine group-functionalized polyethylene (PE)-coated polypropylene (PP) nonwoven fabric as a ligand, reductant, and template, taking advantage of the different effects of radiation of PE and PP layers. 20 However, adsorbents prepared in the previously published work contain two steps: preirradiation-induced graft polymerization and then modification.…”

Recovery of Scandium from Hot Spring Water with Graft Adsorbent Containing Phosphoric Groups

“…Hence, recovering Sc with a fibrous graft adsorbent from hot spring water has been being investigated 4) . Radiation-induced graft polymerization (RIGP) is a superior technique to functionalize a polymer based material like polyethylene 5,6) . The advantage of RIGP is able to generate radicals in a base material, without using an initiator.…”