| 用异羟肟酸从氢氧化铁中溶出铁的动力学研究 |
| KINETIC STUDY ON DISSOLUTION OF IRON FROM FERRIC HYDROXIDE WITH HYDROXAMIC ACIDS |
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| 摘要: 用颗粒法、压片法及以琼脂为基质的凝胶法测定了用七种合成异羟肟酸从氢氧化铁中溶出铁的速率常数.测得结果表明用同一种方法测得的七种异羟肟酸的溶出铁的反应级数都等于1,而且速率常数基本相等.搅拌速度明显影响反应速率.pH值也对测得的k值有一定影响,并在pH7～9处有拐点.拐点处大约相当于该异羟肟酸的pKa.据此提出用异羟肟酸溶出氢氧化铁中的铁的速率由物质运送及表面效应共同决定,而以运送为主.颗粒法与压片法相比,前者的溶出速率较大,可以解释为固体颗粒总表面积大于后者之故. |
| 关键词: 异羟肟酸 氧氢化铁 |
| 基金项目: |
| Abstract: The dissolution rate constants of ferric hydroxide by means of seven synthetic hydroxamic acids were determined with granular method, Hi-guchi's pellet method and Ziolkowski's agar gel method. In all cases, the dissolution follow the first order mechanism,with practically the same rate constant. The stirring rate and pH values affect the dissolution rate significantly. A turning point was found in the logk vs. pH curve and this point may be related to the dissociation of the hydroxamic acid. Thus the dissolution process is suggested to be transport and surface controlled. The difference of logk between granular and pellet methods may be interpreted in terms of the difference of specific area, while the k values become much higher in agar-agar medium is noteworthy, because the number of ferric ions in unit surface area is much less than that in the granules and the pellets, in which no organic matrix present. |
| Keywords: hydroxamic acid ferric hydroxide |
| 投稿时间：1986-01-28 |
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| 许善锦,张法浩,王铷,王夔.用异羟肟酸从氢氧化铁中溶出铁的动力学研究[J].无机化学学报,1987,3(1):58-65. |
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