Polyoxometalates are metal oxide clusters with many useful chemical properties. The Keggin heteropolyanion has the general formula general formula [XM12O40]n- where M=Mo or W and X can be from all over the periodic table. The Keggin anion readily turns into the lacunary form [XM11O39]n- with adjustments of the alkalinity of solution; this lacunary form is reactive with heavy metals and may perhaps be utilized in a system to store nuclear waste. This system would include adhesion of the anion to a metal oxide colloid to remove waste from solution. In this work, the Keggin heteropolyanion was studied on metal oxides, single crystal silica and alumina, using Atomic Force Microscopy and X-Ray Photoelectron Spectroscopy techniques. Flat single crystals were used as opposed to colloids to employ as many techniques as possible (such as AFM imaging).
Kristina Pontarelli, ’09 Iowa City, IA
Major: Biochemistry and Molecular Biology, Spanish
Craig Teague, Ph.D.
Sponsor: Craig Teague