Photocatalytic reduction of nitrate in water on meso-porous hollandite catalyst: a new pathway on removal of nitrate in water

Toshiyuki Mori, Jun Suzuki, Kenjiro Fujimoto, Mamoru Watanabe, Yoshio Hasegawa

研究成果: Conference article査読

20 被引用数 (Scopus)

抄録

Photocatalysis of a hollandite compound KxGaxSn8-xO16 (x = ca. 1.8) was examined for the reduction of nitrate to N2 with a reducing agent of methanol in water under UV irradiation. Hollandites have a characteristic one-dimensional tunnel structure. The meso-porous hollandite was prepared by sol-gel method. This hollandite was used as the photocatalyst and its reaction process was quantitatively analyzed by using ion chromatograph and on-line mass spectrometry. The hollandite photocatalyst showed a significant activity for the formation of N2 from NO3-. Two factors, an increase in UV intensity and a lowering in pH of the solution, contributed to improvement in the selectivity for N2. The selectivity for N2 was improved to reach the perfect level by adjusting the factors. Although, in the previous report, the nitrate was mainly reduced to NH4+ or NO2-, the present photocatalytic conditions converted it to N2. The observed photocatalytic reduction of NO3- to N2 with reducing agent CH3OH was conjugated to the partial oxidation of CH3OH to HCOOH. This high selective photocatalytic decomposition of NO3- to N2 may be a new pathway among the others reported so far, and it would be useful for environmental protection of water.

本文言語English
ページ(範囲)505-510
ページ数6
ジャーナルJournal of Sol-Gel Science and Technology
19
1-3
DOI
出版ステータスPublished - 1 12月 2000
イベント10th International Workshop pn Glass and Ceramics, Hybrids and Nanocomposites from Gels - Yokohama, Jpn
継続期間: 20 9月 199924 9月 1999

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