Metal doped nanosized titania used for the photocatalytic degradation of rhodamine B dye under visible-light.

Metal doped nanosized titania used for the photocatalytic degradation of rhodamine B dye under visible-light.

Journal of nanoscience and nanotechnology (2013-08-02)

Mphilisi M Mahlambi, Ajay K Mishra, Shivani B Mishra, Rui W Krause, Bhekie B Mamba, Ashok M Raichur

ABSTRACT

Metal-doped anatase nanosized titania photocatalysts were successfully synthesized using a sol-gel process. Different amounts of the dopants (0.2, 0.4, 0.6, 0.8 and 1.0%) of the metals (Ag, Ni, Co and Pd) were utilized. The UV-Vis spectra (solid state diffuse reflectance spectra) of the doped nanoparticles exhibited a red shift in the absorption edge as a result of metal doping. The metal-doped nanoparticles were investigated for their photocatalytic activity under visible-light irradiation using Rhodamine B (Rh B) as a control pollutant. The results obtained indicate that the metal-doped titania had the highest activity at 0.4% metal loading. The kinetic models revealed that the photodegradation of Rh B followed a pseudo first order reaction. From ion chromatography (IC) analysis the degradation by-products Rhodamine B fragments were found to be acetate, chloride, nitrite, carbonate and nitrate ions.

MATERIALI

N° Catalogo

Marchio

Descrizione del prodotto

718467

Sigma-Aldrich

Titanium(IV) oxide, nanopowder, 21 nm primary particle size (TEM), ≥99.5% trace metals basis

R6626

Sigma-Aldrich

Rhodamine B, ≥95% (HPLC)

637254

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Titanium(IV) oxide, anatase, nanopowder, <25 nm particle size, 99.7% trace metals basis

83689

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Rhodamine B, for fluorescence

232033

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Titanium(IV) oxide, anatase, powder, 99.8% trace metals basis

14021

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Titanium(IV) oxide, ReagentPlus^®, ≥99%

224227

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Titanium(IV) oxide, rutile, powder, <5 μm, ≥99.9% trace metals basis

248576

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Titanium(IV) oxide, anatase, powder, −325 mesh, ≥99% trace metals basis

637262

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Titanium(IV) oxide, rutile, nanopowder, <100 nm particle size, 99.5% trace metals basis

634662

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Titanium(IV) oxide, mixture of rutile and anatase, nanopowder, <100 nm particle size (BET), 99.5% trace metals basis

366994

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Titanium, powder, <45 μm avg. part. size, 99.98% trace metals basis

348791

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Titanium, foil, thickness 0.127 mm, 99.7% trace metals basis

267503

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Titanium, foil, thickness 0.25 mm, 99.7% trace metals basis

700347

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Titanium(IV) oxide, mixture of rutile and anatase, nanoparticles, <150 nm particle size (volume distribution, DLS), dispersion, 40 wt. % in H₂O, 99.5% trace metals basis

268496

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204757

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204730

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677469

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