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Development of superparamagnetic particles for analytical pre-concentration

Development of superparamagnetic particles for analytical pre-concentration
Development of superparamagnetic particles for analytical pre-concentration
The very low levels of trace heavy metals and organic pollutants in water can present difficulties for the analytical chemist that can often be overcome by employing a pre-concentration method to enrich the analyte. Adsorbants and reactive solid phase materials can be used to scavenge analytes from the solution and to isolate them from interfering species. In this work Fe2O3 superparamagnetic nano-particles were covered with a chemically modified mesoporous silica layer, able to uptake the target analyte. The solid phase, with attached analyte, can then be easily isolated from the sample solution by the application of an external magnetic field. Two different types of nano-sized particles were synthesised by modification of the silica by silanization. 3- aminopropyltriethoxysilane was reacted with the –OH groups present on the surface and in turn its –NH2 groups were converted to dithiocarbamates. This type of particle was tested for copper extraction but was found to be unsuccessful due to the leakage of large quantities of iron into solution which competed with the analyte for the dithiocarbamate groups. Octadecyltrichlorosilane was reacted with the silica surface to give a second type of particle specialised in collecting organic pollutants. Recoveries above 80% were obtained extracting polycyclic aromatic hydrocarbons and during a pilot experiment, 92% recovery of “tributyltin” was achieved
Vescovo, Luca
2f80985d-c5ec-41ba-8b98-57b4677b4929
Vescovo, Luca
2f80985d-c5ec-41ba-8b98-57b4677b4929
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5

Vescovo, Luca (2011) Development of superparamagnetic particles for analytical pre-concentration. University of Southampton, Chemistry, Masters Thesis, 114pp.

Record type: Thesis (Masters)

Abstract

The very low levels of trace heavy metals and organic pollutants in water can present difficulties for the analytical chemist that can often be overcome by employing a pre-concentration method to enrich the analyte. Adsorbants and reactive solid phase materials can be used to scavenge analytes from the solution and to isolate them from interfering species. In this work Fe2O3 superparamagnetic nano-particles were covered with a chemically modified mesoporous silica layer, able to uptake the target analyte. The solid phase, with attached analyte, can then be easily isolated from the sample solution by the application of an external magnetic field. Two different types of nano-sized particles were synthesised by modification of the silica by silanization. 3- aminopropyltriethoxysilane was reacted with the –OH groups present on the surface and in turn its –NH2 groups were converted to dithiocarbamates. This type of particle was tested for copper extraction but was found to be unsuccessful due to the leakage of large quantities of iron into solution which competed with the analyte for the dithiocarbamate groups. Octadecyltrichlorosilane was reacted with the silica surface to give a second type of particle specialised in collecting organic pollutants. Recoveries above 80% were obtained extracting polycyclic aromatic hydrocarbons and during a pilot experiment, 92% recovery of “tributyltin” was achieved

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Submitted date: 30 June 2011
Organisations: University of Southampton, Chemistry

Identifiers

Local EPrints ID: 202877
URI: http://eprints.soton.ac.uk/id/eprint/202877
PURE UUID: 893a396f-52a3-47af-8c88-16c996c38081
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163

Catalogue record

Date deposited: 10 Nov 2011 09:55
Last modified: 30 Jan 2020 01:28

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