Construction of carbon-based bromide ion permselective membrane and its separation property for bromide
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-.
bromine ionelectrochemically switched ion permselectiveseparation and recoverycarbon nanotubescarbon-based membrane
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