Use of Hydroxyl Radical Yield to Investigate a Urea and Cobalt Modified TiO₂ Photocatalyst Degrading Rhodamine B under UV and Visible Light

Abstract:

Material modification of TiO₂ photo-catalyst (NMTi) by doping urea and cobalt via sol-gel method was used to achieve high efficiency degradation of rhodamine B (RhB) under visible light (Vis). Although good removal (up to 42% of TOC removed) of RhB by Degussa P25 under ultra violet irradiation, P25 did not effectively degrade RhB (up to 14% TOC removed) under Vis. In the batch photo-catalytic experiment with Vis irradiation, the removal efficiencies of absorbance and TOC by NMTi were 28 and 30%. We used terephthalic acid as fluorescence probe to catch hydroxyl radical (OH) and calculated their quantum yields. The OH yields of NMTi with Vis irradiating was 8.91×10^-6 while P25 of 2.65×10^-6 (P25 of 1.44×10^-5 and NMTi of 1.00×10^-5 under UV). The OH yields of NMTi were higher than that of P25 under Vis, but otherwise under UV irradiation. Therefore, our new composited NMTi was more effective than P25 under Vis for both absorbance and TOC removal of RhB. It seemed possessed the application potential under Vis irradiation.

• Periodical: Advanced Materials Research (Volume 773)
• Pages: 595-600
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.773.595
• Online since: September 2013
• Authors: Jyun Hong Shen, Pei Chi Lu, Jao Jia Horng
• Keywords: Fluorescence Probe, Material Modification, Quantum Yield, Rhodamine B (RhB), TiO₂ Photo-Catalysis

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