标准状态下水溶性二氧化氯的稳定及歧化

Stability and disproportionation of aqueous chlorine dioxide in the standard state

在电子活度 (pε)和 pH优势区域图上 ,建立了包括氯酸根、二氧化氯、亚氯酸、亚氯酸根、次氯酸、次氯酸根、氯气和氯离子的氯体系多元平衡模式 ;发现二氧化氯在极强酸度和高电子活度区域稳定存在 ,水溶性二氧化氯则不稳定 .同时 ,根据反应自由能变化 ,提出了摩尔电子驱动力的概念 ,借助它分析了二氧化氯在水溶液中的歧化趋势 ,结果表明 ,二氧化氯在碱性溶液中的歧化反应远比在酸性溶液中进行得快 ,在全 pH范围内 ,二氧化氯表现出趋于强酸环境而保持自身稳定的趋势 ,与由pε- pH优势区域图所确立的二氧化氯稳定区定位相一致 。

The predominance area diagram of electron activity (p ε ) as a function of pH for chlorine system with chlorate ion, chlorine dioxide, chlorous acid, chlorite ion, hypochlorous acid, hypochlorite ion, molecular chlorine and chloride ion has been constructed. It is found that chlorine dioxide is stable under extremely strong acidity and high electron activity, and that aqueous chlorine dioxide is unstable. Moreover, a concept of mole electron driving force (MEDF) was advanced in accordance with the changes...