The Photocatalytic Activities Induced by Sulfurization-Oxidation Processing of SrHfO<SUB>3</SUB>

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Other Title
  • 三酸化ストロンチウムハフニウムの硫化・酸化処理による光触媒活性の発現
  • The photocatalytic activities induced by sulfurization-oxidation processing of SrHfO3.

Abstract

Since hafnium belongs to the same group of elements as titanium and zirconium, SrHfO3 may have photocatalytic activity comparable to those observed for SrTiO3 and SrZrO3. The band gap of SrHfO3 is too large to be excited in the visible region of light. To improve this sulfurization-oxidation cyclic processings were tried. The sulfurization was made in CS2atmosphere (13.3 Pa) at 900°C, and then oxidation was made in O2 atmosphere (0.1 MPa)at 600°C. The SrHfO3 treated by three cyclic processings became to absorb visible light. The SrHfO3 catalyst, thus prepared photolyzed H2O-2-propanol and H2O-methanol system with quantum efficiencies as high as 9.7%. Such visible light responsiveness may have been caused by the introduction of SO2- ions during the CS2-O2 processing cycle.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1986 (6), 756-761, 1986-06-10

    The Chemical Society of Japan

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