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The effect of Pt oxidation state and concentration on the photocatalytic removal of aqueous ammonia with Pt-modified titania

Paper ID Volume ID Publish Year Pages File Format Full-Text
28993 44112 2008 8 PDF Available
Title
The effect of Pt oxidation state and concentration on the photocatalytic removal of aqueous ammonia with Pt-modified titania
Abstract

Platinum-modified titanium (IV) oxide (Pt-TiO2) was used to photocatalytically oxidize aqueous ammonia selectively to nitrogen gas. The photocatalyst was solvent deposited on acrylic (PMMA) supports for use in simple distributive reactors. Pt was photodeposited on the titania surface within each reactor with concentrations ranging from 0.4% (w/w) to 5.1% (w/w) Pt. The oxidation state of the deposited Pt was subsequently modified using reduced phosphotungstic acid. Time-dependent kinetic studies were used to demonstrate the effect of oxidation state on the photocatalytic activity of the Pt-TiO2. It was determined that treatment with reduced phosphotungstic acid enhanced the reaction rate and selectivity to nitrogen gas of the Pt-TiO2 photocatalysts. Most significantly, treatment of Pt-TiO2 with reduced phosphotungstic acid shifts the optimum Pt concentration to higher Pt loadings. The reactor containing 3.2% (w/w) post-treated Pt demonstrated the most favorable combination of NH3 degradation rate and selectivity to N2, resulting in the removal of 28.34% total nitrogen from 1.7 L of a 45.5 ppm NH3-N solution within 72 h.

Keywords
Titania; Photocatalysis; Ammonia; Platinum
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The effect of Pt oxidation state and concentration on the photocatalytic removal of aqueous ammonia with Pt-modified titania
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 200, Issues 2–3, 15 December 2008, Pages 246–253
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us