Photocatalytic processes with tungsten oxygen anion clusters.

Photocatalytic processes with tungsten oxygen anion clusters.

Frontiers in bioscience : a journal and virtual library (2003-09-06)

Elias Papaconstantinou, Anastasia Hiskia, Aristidis Troupis

ABSTRACT

Polyoxometalates (POM) have a rich and promising photochemical behavior. Upon illumination at the O M CT band (i.e., in UV and near-visible area) become powerful oxidizing reagents able to oxidize various organic compounds. In the process POM undergo stepwise reduction accumulating electrons that can be subsequently delivered, via thermal reactions to a variety of oxidants. This way a great variety of organic compounds are oxidized and indeed mineralize to CO2, H2O and inorganic anions and several organic and inorganic compounds can be reduced via a photocatalytic process in which POM serve as electron relays. Thus, in principle, POM can serve as decontamination photocatalysts of aquatic media removing both organic pollutants and metal ions. Under special conditions controlled photocatalytic reactions have been reported. In addition the reduction precipitation of metal ions mediated by POM may lead to formation of metal nanoparticles in which POM serve as reducing reagents and stabilizers.

MATERIALS

Product Number

Brand

Product Description

GF75550866

Tungsten, foil, 0.2m coil, thickness 0.025mm, coil width 1mm, as rolled, 99.95%

267546

Sigma-Aldrich

Tungsten, foil, thickness 0.25 mm, ≥99.9% trace metals basis

GF87677915

Tungsten, foil, 1m coil, thickness 0.08mm, coil width .9mm, as rolled, 99.95%

GF78315419

Tungsten, foil, 0.5m coil, thickness 0.10mm, coil width .9mm, as rolled, 99.95%

GF91197748

Tungsten, foil, 1m coil, thickness 0.1mm, coil width .6mm, as rolled, 99.95%

GF74651698

Tungsten, foil, 100x100mm, thickness 0.5mm, as rolled, 99.95%

GF87782732

Tungsten, foil, 200x200mm, thickness 0.15mm, as rolled, 99.95%

GF69067053

Tungsten, wire, straight, 300mm, diameter 0.125mm, 99.9+%

GF82140386

Tungsten, wire, straight, 300mm, diameter 0.10mm, 99.9+%

GF87331990

Tungsten, wire, straight, 300mm, diameter 0.15mm, 99.9+%

GF76130232

Tungsten, wire, straight, 300mm, diameter 0.5mm, 99.9+%

GF93128890

Tungsten, wire, straight, 450mm, diameter 0.38mm, 99.9+%

GF90717666

Tungsten, microfoil, disks, 10mm, thinness 0.05μm, specific density 96μg/cm², permanent mylar 3.5μm support, 99.95%

GF82229542

Tungsten, insulated wire, 0.5m, conductor diameter 0.015mm, insulation thickness 0.002mm, polyimide insulation, 99.9%

GF75672254

Tungsten, insulated wire, 2m, conductor diameter 0.0125mm, insulation thickness 0.0035mm, polyimide insulation, 99.9%

GF73441199

Tungsten, microfoil, disks, 10mm, thinness 0.1μm, specific density 182μg/cm², permanent mylar 3.5μm support, 99.95%

GF69782349

Tungsten, insulated wire, 5m, conductor diameter 0.075mm, insulation thickness 0.02mm, PTFE (polytetrafluoroethylene) insulation, 99.9%

GF81654655

Tungsten, insulated wire, 5m, conductor diameter 0.05mm, insulation thickness 0.008mm, polyimide insulation, 99.9%

GF91891266

Tungsten, insulated wire, 10m, conductor diameter 0.05mm, insulation thickness 0.008mm, polyimide insulation, 99.9%

GF86719461

Tungsten, foil, not light tested, 25x25mm, thickness 0.006mm, 99.95%

GF79060103

Tungsten, insulated wire, 2m, conductor diameter 0.025mm, insulation thickness 0.005mm, polyimide insulation, 99.9%

GF73661575

Tungsten, insulated wire, 2m, conductor diameter 0.05mm, insulation thickness 0.008mm, polyimide insulation, 99.9%

GF84846729

Tungsten, foil, not light tested, 25x25mm, thickness 0.008mm, 99.95%

GF79938039

Tungsten, lump, 50g, max. size 5mm

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Tungsten, rod, 200mm, diameter 6.35mm, centerless ground, 99.95%

GF80605379

Tungsten, insulated wire, 1m, conductor diameter 0.0125mm, insulation thickness 0.0035mm, polyimide insulation, 99.9%

GF81439836

Tungsten, insulated wire, 50m, conductor diameter 0.05mm, insulation thickness 0.008mm, polyimide insulation, 99.9%

GF94362521

Tungsten, rod, 8.25mm, diameter 9.5mm, centerless ground, 99.95%

GF71173155

Tungsten, insulated wire, 0.2m, conductor diameter 0.0125mm, insulation thickness 0.0035mm, polyimide insulation, 99.9%

GF71957155

Tungsten, wire reel, 1000m, diameter 0.025mm, clean, 99.95%