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Title: Arsenic remediation using nanocrystalline titanium dioxide
Author: Duncan, Elizabeth Gunn
ISNI:       0000 0004 2677 6595
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2009
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Dissolution of arsenic bearing minerals in groundwater (used as drinking water) can lead to concentrations of >0.05 mg/L of arsenite in many countries, causing serious health effects. Several existing technologies rely on coagulation and adsorption to remove the less toxic form of arsenate (As (V)) (easier to remove from solution than As (III) due to its anionic charge) and the use of harsh oxidants (e.g. ozone). In this work nanocrystalline titanium dioxide (TiO2) has been used as a photocatalytic oxidant (PCO) to oxidise As (III) which also functions as an adsorbent with a high surface area to remove the As (V) from solution. Most previous research has monitored only As (III) removal from solution and the mechanism of PCO is a controversial topic.  The main aim of this work was to use X-ray Photoelectron Spectroscopy (XPS) to study the adsorption and speciation of arsenic adsorbed on TiO2 following PCO.  Aims also included finding a suitable commercial TiO2, characterisation of adsorption of As (V), PCO reactions under different conditions, speciation of arsenic adsorbed by XPS and preliminary studies of the mechanism of PCO and the binding of arsenic species to the surface.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Drinking water ; Arsenic ; Water ; Titanium dioxide