摘要
利用恒界面池研究了二壬基萘磺酸(DNNSA)反胶团溶液萃取废水中锌离子的动力学.考察了搅拌转速、两相接触界面积、DNNSA和初始锌离子浓度以及温度对萃取速率的影响,得到了DNNSA反胶团萃取废水中锌离子的动力学方程并对萃取机理进行了探讨.实验结果表明:水相内化学反应为萃取过程的速率控制步骤.当搅拌速率在200 r·min-1时出现与搅拌强度无关的化学反应动力学"坪区",在动力学"坪区",锌离子萃取速率与萃取剂DNNSA浓度和水相锌离子浓度成正比,温度升高萃取速率增加,萃取反应活化能为61.69 k J·mol-1.
The kinetics of the extraction of zinc by DNNSA reverse micelles from wastewater was investigated using a Lewis cell. Different parameters such as the stirring speed,interfacial areas,DNNSA concentration and zinc ion concentration,as well as extracting temperature were studied separately to examine their effect on the extraction rate of Zn^2＋,and a rate equation was put forward based on the analysis. The experimental results demonstrate that the rate of zinc extraction is controlled by a chemical reaction in the bulk aqueous phase rather than at the interface. When stirring speed was more than200 r·min^- 1,there was a chemical reaction kinetic region where the extraction rate of Zn（ Ⅱ） was independent of the stirring speed. In the kinetic region,the rate of Zn（ Ⅱ） extraction was direct proportional to concentration of Zn（ Ⅱ） and DNNSA. The rate also increased with extraction temperature rising. The activation energy was calculated to be 61. 69 k J·mol^- 1.
出处
《环境科学学报》
CAS
CSCD
北大核心
2015年第8期2435-2441,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.11405113)
四川省教育厅资助科研项目(No.15ZA0189)~~
关键词
恒界面池
动力学
反胶团
萃取
锌
废水
Lewis Cell
kinetics
reverse micelles
extraction
zinc
wastewater
