Description:
<jats:title>Abstract</jats:title>
<jats:p>A relationship between the local structure and the visible-light activated photocatalytic effect was investigated in the glass and glass ceramics prepared by recycling waste slag, which was discharged from a Tokyo Household Garbage Combustion Plant. For the preparation of a homogeneous sample of waste slag recycled glass, (WSRG), 10 wt% of Na<jats:sub>2</jats:sub>CO<jats:sub>3</jats:sub> and 10–50 wt% of Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> were added. <jats:sup>57</jats:sup>Fe-Mössbauer spectra of WSRG recorded at liquid nitrogen temperature showed three types of magnetic <jats:italic>hfs</jats:italic>; one due to Fe<jats:sup>II</jats:sup>(<jats:italic>O</jats:italic>
<jats:sub>h</jats:sub>) with <jats:italic>δ</jats:italic> of 1.21 mm s<jats:sup>−1</jats:sup> and <jats:italic>H</jats:italic>
<jats:sub>int</jats:sub> of 46.7 T, one due to Fe<jats:sup>III</jats:sup>(<jats:italic>O</jats:italic>
<jats:sub>h</jats:sub>) with <jats:italic>δ</jats:italic> of 0.46 mm s<jats:sup>−1</jats:sup> and <jats:italic>H</jats:italic>
<jats:sub>int</jats:sub> of 44.1 T, and the other due to Fe<jats:sup>III</jats:sup>(<jats:italic>T</jats:italic>
<jats:sub>d</jats:sub>) with <jats:italic>δ</jats:italic> of 0.38 mm s<jats:sup>−1</jats:sup> and <jats:italic>H</jats:italic>
<jats:sub>int</jats:sub> of 47.8 T. They were superimposed on a relaxation spectrum due to superparamagnetic hematite. Methylene blue (MB) degradation test with 40 mg of the heat treated WSRG (50 wt% Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>), under the visible-light irradiation for 6 h showed a marked decrease in the concentration of MB from 20 to 7.7 μmol L<jats:sup>−1</jats:sup> with a rate constant (<jats:italic>k</jats:italic>) of 2.7×10<jats:sup>−3</jats:sup> min<jats:sup>−1</jats:sup> which was close to the <jats:italic>k</jats:italic>, 9.26×10<jats:sup>−3</jats:sup> min<jats:sup>− 1</jats:sup>, recently obtained in 15Na<jats:sub>2</jats:sub>O⋅15CaO⋅40Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>⋅ 11Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>⋅19SiO<jats:sub>2</jats:sub> glass.</jats:p>