Mechanical and metal adsorption properties of emulsion gel adsorbents composed of PEGDA-co-PEG hydrogels and tri-n-octylamine

A novel type of emulsion gel adsorbent consisting of a polymeric hydrogel containing randomly distributed oil microdroplets of an extractant was developed for metal separation. A copolymer hydrogel composed of poly(ethylene glycol) diacrylate (PEGDA; cross-linking monomer) and polyethylene glycol (P...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2018-04, Vol.75 (4), p.1597-1606
Main Authors: Tokuyama, Hideaki, Nakahata, Yu, Sato, Ryuichi, Nagatsu, Yuichiro, Ban, Takahiko
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Copolymers
Crosslinking
Deformation
Diffusion rate
Emulsions
Free radicals
Hydrogels
Mechanical properties
Organic Chemistry
Original Paper
Physical Chemistry
Polyethylene glycol
Polymer Sciences
Polymerization
Soft and Granular Matter
Solvent extraction
Solvent extraction processes
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Summary:A novel type of emulsion gel adsorbent consisting of a polymeric hydrogel containing randomly distributed oil microdroplets of an extractant was developed for metal separation. A copolymer hydrogel composed of poly(ethylene glycol) diacrylate (PEGDA; cross-linking monomer) and polyethylene glycol (PEG), i.e., a PEGDA- co -PEG hydrogel, was developed; the hydrogel with PEGDA = 500 mol/m 3 and PEG = 50 kg/m 3 possessed improved flexibility and strength. The emulsion gel containing an amine extractant, tri- n -octylamine, successfully adsorbed Zn(II) ions. The metal–extractant complexation process and its pH dependence in the emulsion gel were comparable to those of the solvent extraction method. Investigation of the metal adsorption kinetics revealed that diffusion of the solute in the hydrogel phase is fast, and diffusion (accumulation) in the organic extractant phase is the rate-determining step.
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-017-2116-x