泡沫分离除去水溶液中微量金属离子

Removal of Trace Metal Ions from Aqueous Solution by Foam Fractionation

以十二烷基苯磺酸为表面活性物质,采用泡沫分离技术分别对脱除水溶液中微量的铁、铜、钠离子的分离过程进行了研究。重点考察了溶液的pH、表观气速、表面活性剂浓度及泡沫塔装液量对分离效果的影响。结果表明在各自最佳操作条件下铁离子(Ⅲ)的去除率为95.2%,富集比为13.6;铜离子(Ⅱ)的去除率为94.6%,富集比为16.5;钠离子去除率为73.1%,富集比为32.3。与常规的表面活性剂十二烷基硫酸钠相比,十二烷基苯磺酸在泡沫分离过程结束后不会在体系中引入新的金属离子,这为探索脱盐新方法提供了依据。

Removals of Fe^3＋, Cu^2＋ and Na^＋ from simulated aqueous solution were studied respectively by using foam fractionation with dodecylbenzenesulphonic acid （DBSA） as surfactant. In order to develop the new desalination method, foam fractionation, which has the virtues of simple equipments and technology, non-pollution and low cost, the effects of operating parameters, such as the pH of the bulk liquid, superficial gas velocity, surfactant dosage and volume of solution, on the enrichment ratios and removal ratios of Fe^3＋, Cu^2＋ and Na^＋ were investigated in detail respectively. The experimental results show that, under respective optimum conditions found, the removals of Fe^3＋, Cu^2＋ and Na^＋ approach 95.2%, 94.6% and 73.1%, respectively, and the enrichment ratios of them reach 13.6, 16.5 and 32.3, respectively. Comparing using DBSA as surfactant with using commonly-used surfactant sodium dodecyl sulfate （SDS）, the former will not introduce any additional pollution of introducing new metal ions into the aqueous solution; thereby a new method is put forward for removing salts by foam fractionation.