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The synthesis of adsorbents for metal ions in soils and ores

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Grosse, Andrew Clifton (1998) The synthesis of adsorbents for metal ions in soils and ores. Research Master thesis, University of Tasmania.

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Abstract

A series of porous copolymer resins with ionogenic or chelating
functional groups was prepared from commercial polystyrene or
polymethacrylate precursors. Samples of all resins were supplied to Geo2
laboratories for assessment of their efficacy in a proprietary heavy metal
remediation process. Two of these resins, DMA-1 and CMS-2, were
prepared in bulk to supply pilot scale testing.
The crosslinked resin-bead substrates used were: chloromethylated
polystyrene (CMS), diethylenetriamine poly(methacrylamide) (DMA),
glycidyl methacrylate (GMA), and three types of poly(methyl
methacrylate) (MMA, MMB & MMC) with varying degrees of porosity
and crosslinking.
The alkyl halide moiety of CMS was used to anchor 2° or 3°
alkylamines, diethylenetriamine, tris(2-aminoethylamine), or a
quaternary ammonium group. Alternatively, a primary amine group was
introduced via hydrolysis of hexamethylene tetramine.
Poly(ethylene glycol)s of various sizes were affixed to the
chloromethylated substrate via Williamson ether synthesis to form
"pseudocrown" ether chains. Benzocrown ether groups were produced by
anchoring catechol to the CMS resin and subsequent reaction with a,codichloropoly(ethylene
glycol).
Functional groups on poly(methyl methacrylate) resins were
introduced via hydrolysis of the backbone, or by aminolysis with tris(2-
aminoethyl)amine or 2-aminoethanol. The epoxide moiety of GMA was alkylated with either high-pressure ammonia, tris(2-aminoethyl)amine,
or various grades of poly(ethylene glycol)s. Hydrolysis of the epoxide in
aqueous acid was also investigated.
Resins with aminocarboxylate moieties were prepared via
carboxymethylation of resins with primary amine or diethylenetriamine
groups (including DMA), using excess chloroacetic acid in aqueous
carbonate solution. The moieties prepared were diethylenetriamine
triacetic- and tetraacetic- acids, and aminodiacetic acid. Several nonporous
pseudocrown ether materials were also produced via
copolymerisation, yielding urethane or methacrylate substrates.
The resins were characterised by elemental analysis, and by their
Infra-Red spectra. A subset of resins was also characterised by their affinity
and capacity to adsorb metal ions in aqueous solution. The sorption of
copper from a 75 ppm solution into these resins was measured over a 25
hour period. Adsorption isotherms for Cu 2+ in 0.010 M aqueous
hydrochloric acid were also obtained in the range 10-75 ppm. The highest
metal capacities were achieved with aminocarboxylate functionalities;
amine resins adsorbed very little.

Item Type: Thesis (Research Master)
Keywords: Ion exchange resins, Heavy metals
Copyright Holders: The Author
Copyright Information:

Copyright 1998 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Sc.)--University of Tasmania, 1998. Includes bibliographical references

Date Deposited: 09 Dec 2014 00:04
Last Modified: 11 Mar 2016 05:55
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