以丁二酮肟为配体,十二烷基磺酸钠为捕集剂,对镍离子-丁二酮肟在水相中形成的Ni-丁二酮肟-十二烷基磺酸钠体系的溶剂气浮进行了研究.研究表明表面活性剂与Ni离子的物质的量之比为20:1,约1 h水中的镍离子去除率可达90%.溶剂气浮的速率随着气流速率的增加而增加,共存溶剂乙醇、NaCl存在会使去除率降低,有机溶剂的量对溶剂气浮影响较小,溶剂气浮过程遵从假一级动力学.考察了不同温度下溶剂气浮的回收速率,计算了该过程中的气浮表观活化能为8.99 kJ/mol.而且将实验数据与理论模型进行了数值拟合.%The removal of Ni ion from an aqueous solution was carried out by solvent sublation of Ni-diacetyldioximesodium dodecylbenzensulphonic (sublate) into isopentanol. The ratio of surfactant to Ni-diacetyldioxime complex at 20:1 was most effective for the removal, with over 90% Ni ion removed from the aqueous solution within 1 h. The effects of electrolytes (e.g. NaCl), non-hydrophobic organics (e.g. ethanol) and pH of the solution upon the process were well studied. The removal rate was enhanced by higher airflow rates but almost independent on the volume of the organic solvent floating on the top of the aqueous column. The process of solvent sublation followed first order kinetics. A characteristic parameter, the apparent activation energy of attachment of the sublate to bubbles, was estimated to be 8.99 kJ/mol. Furthermore, the simulation of a mathematical model with the experiment data on the solvent sublation of Ni-diacetyldioxime-SDS was proved to be validated.
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