Adsorption and decomposition of water-dissolved ozone on high silica zeolites.
Adsorption and decomposition of water-dissolved ozone on high silica zeolites.
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DOI：
10.1016/s0043-1354(03)00382-8
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发表时间：
2004
期刊：
影响因子：
12.8
通讯作者：
Hirotaka Fujita;J. Izumi;M. Sagehashi;T. Fujii;A. Sakoda
中科院分区：
文献类型：
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作者：
Hirotaka Fujita;J. Izumi;M. Sagehashi;T. Fujii;A. Sakoda
研究了水溶性臭氧在高硅沸石上的吸附性能。吸附的臭氧几乎可逆地解吸。吸附平衡关系可用线性方程q=βC表示，其中q为吸附量，C为平衡浓度，β为平衡常数。β值还与SiO2/Al 2 O3摩尔比和高硅沸石的孔结构密切相关。SiO2/Al 2 O3比值越大，β值越大。ZSM-5（SiO2/Al 2 O3比：3000）对水中溶解的臭氧具有最高的吸附容量，能够使水中溶解的臭氧高度浓缩在吸附剂上。研究了吸附态臭氧的分解行为。臭氧在高硅沸石上的吸附比臭氧在水体中的吸附稳定。在30-3000的范围内，分解速率与SiO2/Al 2 O3比或溶液pH值在4-6的范围内无关。
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=βC, where q is the amount adsorbed, C is the equilibrium concentration and β is the equilibrium constant. Also, the β values were strongly dependent on the SiO2/Al2O3ratio (mol/mol) and on the pore structure of the high silica zeolites. The larger the SiO2/Al2O3ratio, the larger the value of β. ZSM-5 (SiO2/Al2O3ratio: 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/Al2O3ratios in the range of 30–3000 or a solution pH in the range of 4–6.