摘要
基于煤基炭膜设计了一种新型电控膜分离系统,在煤基炭膜电极上采用电控离子交换(ESIX)技术,使铅离子进行周期性的吸/脱附过程,并结合液路系统实现废液中低浓度铅离子的连续分离。实验中分别考察了膜电极施加电位、铅离子初始质量浓度、再生液pH值对炭膜铅离子分离效果的影响,进而评价膜电极的分离性能。实验结果表明:膜电极施加电位时,铅离子的吸、脱附效率与未施加电位时相比分别提高了2.2倍和2.3倍;随着膜电极吸附/脱附时所加电位分别增大至-0.5 V和1.1 V,铅离子的吸、脱附效率不断增大,且施加电位时,经炭膜处理后的溶液中铅离子质量浓度为0 mg/L,去除率为100%;随着铅离子初始质量浓度的增加,铅离子的吸附量不断增加;由再生实验可得,再生液pH=3时脱附效率高达99%.
In this study, we designed a new type of electric separation system based on carbon membrane. With electrochemically switched ion exchange (ESIX) on the membrane electrode, lead ions was adsorbed or desorbed, achieving continuous separation of low concentration lead ions connected with the liquid road system. In the experiment, the effect of electrode potential, initial concentration of lead ions and pH value of the regenerated liquid on the separation were investigated, and the separation performance of the membrane electrode was evaluated. The results show that when the membrane electrode was applied potential, the adsorption and desorption efficiency increased by 2.2 times and 2.3 times respectively compared with the unapplied potential. As adsorption/desorption potential increased to 0.5 V and 1.1 V respectively, the adsorption and desorption efficiency increased, and the lead ion in the solution concentration after carbon membrane treatment was 0 mg/L when potential was applied, the removal rate was 100%. As the initial concentration of lead ions increased, the adsorption capacity of lead ions increased. The regeneration experiment results show the removal efficiency was as high as 99% when pH=3.
作者
蔡富刚
杜晓
高凤凤
常璐通
张兴芳
郝晓刚
CAI Fugang;DU Xiao;GAO Fengfeng;CHANG Lutong;ZHANG Xingfang;HAO Xiaogang(College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024,China)
出处
《太原理工大学学报》
CAS
北大核心
2019年第4期414-420,共7页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(21776191,21706181,21476156)
关键词
电控离子交换
煤基炭膜
膜分离
铅离子
ESIX
coal-based carbon membrane
membrane separation
Pb^2+
