Isolation of hydrogen from water and/or artificial seawater by sonophotocatalysis using alternating irradiation method

被引:34
作者
Harada, H
机构
[1] Meisei Univ, Fac Nucl Sci & Phys Engn, Dept Chem, Hino, Tokyo 1918506, Japan
[2] Meisei Univ, Adv Mat Res & Dev Ctr, Hino, Tokyo 1918506, Japan
关键词
sonolysis; photocatalysis; decomposition of water; sonophotocatalysis; TiO2; seawater; hydrogen;
D O I
10.1016/S0360-3199(00)00095-1
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Sonophotocatalysis means photocatalysis with ultrasonic irradiation. Hydrogen and oxygen were obtained from water under argon atmosphere by sonophotocatalysis and each product was isolated using alternating irradiation method. This method involves irradiation in turn with ultrasound and light. Hydrogen was also isolated from sodium chloride solution, like seawater, using a similar technique. However, the ratio of products from NaCl solution was different from the ideal value. Chloride ions (Cl-) in the solution were activated to . Cl radicals by . OH radicals. which were produced from water by sonolysis. In other words, hydroxyl radicals( . OH) were scavenged by Cl- ions in the solution. When chloride ions (Cl-) are in the solution, it is thought that not only the amount of hydroxyl radicals ( . OH) but also hydrogen peroxide decreases. Due to decreasing H2O2 and/or . OH radicals, O-2 evolution rate would be expected to decrease. (C) 2001 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:303 / 307
页数:5
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