Glutaraldehyde‐crosslinking for improved copper absorption selectivity and chemical stability of polyethyleneimine coatings

Abstract

Nano-thin coatings of glutaraldehyde (GA)-crosslinked polyethyleneimine (PEI) are extremely selective and effective in binding copper from seawater. Here it was demonstrated that GA-PEI performs significantly different from PEI. The copper-selectivity of self-assembled PEI coatings on silicon substrates was greatly improved by GA-crosslinking. After submersion in artificial seawater containing 200 ppb copper and equimolar amounts of 11 competing ions only copper and trace amounts of Zn were detected in the GA-crosslinked coatings, while for non-crosslinked PEI there was about 30% Zn present relative to copper. The coatings were demonstrated to be highly stable under acidic conditions and retained their copper-binding selectivity after repeated cycles of binding and acid-mediated elution. After self-assembly of the GA-crosslinked coating on mesoporous diatomaceous earth particles, significant amounts of copper could be extracted from 200 ppb in artificial seawater and eluted under acidic pH. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43954. © 2016 Wiley Periodicals, Inc

Polyethyleneimine functionalized mesoporous diatomite particles for selective copper recovery from aqueous media

“…The ability of the material to withstand strongly acidic conditions may seem surprising, as GA is known to react with amines to form Schiff 's bases, which commonly are reversible under acidic conditions. However, the high stability with regard to temperature and pH has been explained by aldol condensation and dehydration resulting in ethylenic double bonds conjugated with the imine bonds [47,48]. Furthermore, the adsorbent showed good stability and reproducible efficiency during repeated uptake/elution cycles for 500 mg Cu/dmnew adsorbent suggesting that it could be used for reasonably large number of cycles while retaining its performance.…”

Porous PEI Coating for Copper Ion Storage and Its Controlled Electrochemical Release

“…Nitrogen‐rich, cross‐linked polyethylene imine is known for binding metal ions such as copper and rare earth metals due to the metal chelating property . Its particular selectivity for binding copper ions and its absorption kinetics in a variety of media has extensively been studied . Here, cross‐linked PEI was loaded with copper ions by immersing the PEI‐coated conducting carbon cloth in a known concentration of copper sulfate solution.…”

“…Since cross‐linked PEI is well known to selectively absorb and stabilize Cu(II) ions in its polymer matrix, it is a perfect candidate to overcome passive leaching. Hence, the biocide can be released from a marine surface “on demand” by electrochemical stimuli and the coating can potentially be recharged using copper present in the sea.…”

Neutron scattering in the biological sciences: progress and prospects

“…In addition, converting hydrogenated polymers requires harsh conditions and a transition-metal catalyst in deuterated solvents; this risks undesired changes to the polymer structure and necessitates secondary purification. Similar to the above, the availability of deuterated crosslinkers [such as glutaraldehyde (Linden et al, 2016;Barbosa et al, 2014) or ethylenediamine (Meng et al, 2018;Zhang et al, 2014)] are not available, which may limit neutron investigations of cross-linked structures or hydrophilic gel fabrication.…”