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碳基溴离子选择渗透膜的构筑及其对溴的分离

作者：王洁，张良，罗善霞，杜晓，郝晓刚

单位： 1. 太原理工大学化学工程与技术学院，太原 030024；2. 河北省区域地质调查院，廊坊 065000；3. 中国地质地调查局廊坊自然资源综合调查中心，廊坊 065000

关键词：溴离子；电控离子选择渗透；分离回收；碳纳米管；碳基膜

DOI号：

分类号： TQ028

出版年,卷(期):页码： 2024,44(2):64-71

摘要：

以碳纳米管（CNTs）作为电子传递载体、溴氧铋（BiOBr）作为溴离子（Br-）传输通道、季铵化壳聚糖（QCS）作为成膜剂，通过真空抽滤法制备了碳基溴离子选择渗透膜（CNTs/QCS/BiOBr），并将其应用于电控离子选择渗透膜分离（ESIP）系统中分离回收Br-，探讨了ESIP体系中的操作参数对Br-渗透通量的影响，研究了CNTs/QCS/BiOBr膜在ESIP系统中的稳定性及其对Br-的选择性分离效果。结果表明，当ESIP系统的槽电压和脉冲电压分别为3.5 V和0/-2.5 V时，CNTs/QCS/BiOBr膜对Br-的渗透通量达到了3.00 g/（m2·h）。此外，CNTs/QCS/BiOBr复合膜在ESIP系统中不仅具有循环稳定性，还能实现Br-的选择性分离。

The carbon-based Br- permselective membrane (CNTs/QCS/BiOBr) was constructed by vacuum filtration using carbon nanotubes (CNTs) as the transfer carrier for electrons, bismuth oxybromide (BiOBr) as the transport channels for Br- and quaternized chitosan (QCS)as the membrane forming agent. Subsequently, the CNTs/QCS/BiOBr membrane was assembled in the electrochemically switched ion permselective (ESIP) system for the separation of Br- and the influence of different operating parameters on the separation effect of Br- was investigated. The stability of CNTs/QCS/BiOBr membrane in the ESIP system and their selective separation effect on Br- were researched. The results indicate that the flux of CNTs/QCS/BiOBr composite membrane for Br- reaches 3.00 g/(m2·h) when the cell and pulse voltages in the ESIP system are 3.5 V and 0/-2.5 V, respectively. In addition, the CNTs/QCS/BiOBr composite membrane possesses cycling stability and selectivity for Br-.

基金项目：

国家自然科学基金项目（U21A20303，22078217）；河北省地质矿产勘查开发局科研项目（13000022P00329410110T）

作者简介：

王洁（1995-），女，山西忻州人，博士生，主要从事电控膜分离研究，E-mail：2041550894@qq.com

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