Harada H
Department of Chemistry, Faculty of Physical Sciences and Engineering, Meisei University, Hino-shi, Tokyo 191-8506, Japan.
Ultrason Sonochem. 1998 Jun;5(2):73-7. doi: 10.1016/s1350-4177(98)00015-7.
Sonolysis of carbon dioxide dissolved in water was performed from a standpoint of reducing this material in atmosphere. During one hour of sonication, the amount of CO2 decreased to about half at 5 degrees C under CO2-Ar atmosphere. The decreasing rate for CO2 followed the order Ar > He > H2 > N2 and it was down with increasing temperature in the range of 5-45 degrees C. The most favorable concentration for reducing CO2 was 0.03 (mole fraction of CO2 in gas phase). This concentration in gas phase means an equal mixture of CO2 and Ar in water, because CO2 is more soluble than Ar. Since carbon dioxide dissolved in water would be partly ionized, the roles of ions on the sonolysis were also examined. Gaseous reaction products were CO, H2 and a small amount of O2. Carbon monoxide and hydrogen might be obtained from CO2 and H2O by sonolysis, respectively. Both gases are fuel and react each other to C1 compounds such as methanol, and so on. Therefore, irradiation of ultrasonic waves should be an important technique for reducing CO2.
从减少大气中这种物质的角度出发，对溶解在水中的二氧化碳进行了声解。在5℃的CO₂-Ar气氛下超声处理1小时，CO₂的量减少到约一半。CO₂的减少速率遵循Ar > He > H₂ > N₂的顺序，并且在5-45℃范围内随温度升高而降低。还原CO₂的最适宜浓度为0.03（气相中CO₂的摩尔分数）。气相中的这种浓度意味着水中CO₂和Ar的等量混合物，因为CO₂比Ar更易溶。由于溶解在水中的二氧化碳会部分电离，因此还研究了离子在声解中的作用。气态反应产物为CO、H₂和少量O₂。一氧化碳和氢气可能分别通过声解从CO₂和H₂O中获得。这两种气体都是燃料，并且会相互反应生成甲醇等C1化合物。因此，超声波照射应该是减少CO₂的一项重要技术。
