Adsorption and decomposition of water-dissolved ozone on high silica zeolites

被引：71

作者：

Fujita, H ^{[1
]}

Izumi, J ^{[1
]}

Sagehashi, M ^{[1
]}

Fujii, T ^{[1
]}

Sakoda, A ^{[1
]}

机构：

[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

来源：

WATER RESEARCH | 2004年 / 38卷 / 01期

关键词：

ozone adsorption; siliceous zeolite; concentration; SiO2/Al2O3; Hydrophobicity;

D O I：

10.1016/S0043-1354(03)00382-8

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The adsorption properties of water-dissolved ozone on high silica zeolites were investigated. Adsorbed ozone was desorbed almost reversibly. The adsorption equilibrium relations were described by a linear expression written as q = betaC, where q is the amount adsorbed, C is the equilibrium concentration and beta is the equilibrium constant. Also, the beta values were strongly dependent on the SiO2/Al2O3 ratio (mol/mol) and on the pore structure of the high silica zeolites. The larger the SiO2/Al2O3 ratio, the larger the value of beta. ZSM-5 (SiO2/Al2O3 ratio: 3000), which gave the highest adsorption capacity of water-dissolved ozone, was able to highly concentrate water-dissolved ozone on the adsorbent. The decomposition behavior of adsorbed ozone was also investigated. Ozone adsorbed on high silica zeolite was observed to be a little more stable than ozone existing in bulk water. The decomposition rate was independent of SiO2/Al2O3 ratios in the range of 30-3000 or a solution pH in the range of 4-6. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：159 / 165

页数：7

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