Photocatalytic Activities of Bi2O3, WO3, and Fe2O3: An Assessment through Decomposition of Peroxomonosulfate in Visible Radiation.

スポンサーリンク

概要

• 論文の詳細を見る

• Bi<SUB>2</SUB>O<SUB>3</SUB> semiconductor powder (<I>E</I><SUB>g</SUB>=2.8–2.9 eV) was chosen for the first time to effect photocatalysis and was found to decompose peroxomonosulfate (PMS) with visible light of λ>400 nm. Doping of Bi<SUB>2</SUB>O<SUB>3</SUB> with Cu(II)-ion considerably enhanced the photocatalytic efficiency. The effects of variation of (i) the [dopant] in Cu(II)/Bi<SUB>2</SUB>O<SUB>3</SUB>, (ii) the catalyst amount, and (iii) the initial [PMS] on the rate of decomposition of PMS were investigated. It was observed that (a) 4 atomic % was the optimum [dopant] for Cu(II)/Bi<SUB>2</SUB>C<SUB>3</SUB>, (b) the rate increased linearly with increase in catalyst amount, and (c) the decomposition of PMS followed a Langmuir kinetics in the concentration range, [PMS]<SUB>0</SUB>=0.5–3.0×10<SUP>−3</SUP> mol dm<SUP>−3</SUP>. A suitable reaction mechanism is proposed for the decomposition of PMS involving all the possible reactions. A comparative analysis of the photocatalytic activities of undoped and Cu(II)-doped Bi<SUB>2</SUB>O<SUB>3</SUB>, WO<SUB>3</SUB>, and Fe<SUB>2</SUB>O<SUB>3</SUB> indicated that Cu(II)-doping enhances the activity of Bi<SUB>2</SUB>O<SUB>3</SUB> to a greater extent than those observed with the other two semiconductors. This photocatalytic decomposition of PMS is one of the examples of visible light assisted reaction which otherwise takes place under UV radiation (λ<I>≤</I>280 nm) only.

• 公益社団法人 日本化学会の論文

著者

• Ashokkumar Muthupandian

  Department Of Electronic Chemistry Interdisciplinary Graduate School Of Science And Engineering Toky

• Subramanian Esaikkiappan

  Department of Energy, University of Madras

• Maruthamuthu Pichai

  Department of Chemistry, University of Madras, Autonomous post-Graduate Centre

• Gurunathan Karuppusamy

  Department of Energy, University of Madras

関連論文

• Photoelectrochemical Properties of RuS_2-Coated TiO_2 Electrodes
• Synthesis of Pyrene-Based Ester Dendrimers for Applications in Dye-Sensitized Solar Cells
• Stopped-flow kinetic investigations of one-electron transfer reactions of phenothiazines and their radical cations in aqueous solution.
• Photocatalytic Activities of Bi2O3, WO3, and Fe2O3: An Assessment through Decomposition of Peroxomonosulfate in Visible Radiation.

スポンサーリンク