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Construction of carbon-based bromide ion permselective membrane and its separation property for bromide

Authors： WANG Jie, ZHANG Liang, LUO Shanxia, DU Xiao, HAO Xiaogang

Units： 1. College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China; 2. Regional Geological Survey Institute of Hebei Province, Langfang 065000, China; 3. Langfang Natural Resources Comprehensive Survey Center, China Geological Survey, Langfang 065000, China

KeyWords： bromine ion; electrochemically switched ion permselective; separation and recovery; carbon nanotubes; carbon-based membrane

ClassificationCode：TQ028

year,volume(issue):pagination： 2024,44(2):64-71

Abstract：

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-.

Funds：

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）

AuthorIntro：

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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