title: Immobilization of polyethylenimine nanoclusters onto a cation exchange resin through self-crosslinking for selective Cu(II) removal.
abstract: Donnan membrane principle provides great opportunities for development of highly efficient adsorbents for toxic metals abatement. Based on the principle we prepared a new composite adsorbent by immobilizing polyethylenimine (PEI) nanoclusters within a macroporous cation exchanger D001 through self-crosslinking by glutaraldehyde upon Cu(II)-template process. Negligible PEI loss was observed from the resultant composite adsorbent D001-PEI-GA to solution of pHs 1-12. Increasing solution pH from 1 to 6 results in more favorable Cu(II) retention by D001-PEI-GA, and Cu(II) adsorption onto D001-PEI-GA follows the pseudo-second-order kinetic model well. Compared to D001, D001-PEI-GA displays more preferable Cu(II) sequestration in the presence of co-ions Mg(2+), Ca(2+), Sr(2+) at higher levels. Fixed-bed adsorption of a synthetic solution containing Cu(II) and other co-ions showed that Cu(II) sequestration on D001-PEI-GA could result in its conspicuous decrease from 5mg/L to below 0.01 mg/L with the treatment volume as high as 630 BV per run, while that for D001 was only ∼ 85 BV. Also, the spent composite adsorbent can be readily regenerated by HCl (0.3M)-NaCl (0.5M) binary solution for repeated use with negligible capacity loss.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
authors.forename: Yiliang
authors.initials: Y
authors.lastname: Chen
authors.forename: Bingcai
authors.initials: B
authors.lastname: Pan
authors.forename: Shujuan
authors.initials: S
authors.lastname: Zhang
authors.forename: Haiyan
authors.initials: H
authors.lastname: Li
authors.forename: Lu
authors.initials: L
authors.lastname: Lv
authors.forename: Weiming
authors.initials: W
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D002411:Cation Exchange Resins / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000302:isolation & purification*; D003432:Cross-Linking Reagents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D011094:Polyethyleneimine / Q000737:chemistry*
chemical_list: D002411:Cation Exchange Resins; D003432:Cross-Linking Reagents; D019216:Metals, Heavy; D003300:Copper; D011094:Polyethyleneimine