Electrical double layer ion transport with cell voltage-pulse potential coupling circuit for separating dilute lead ions from wastewater
Electrical double layer ion transport with cell voltage-pulse potential coupling circuit for separating dilute lead ions from wastewater
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利用电池电压-脉冲电势耦合电路进行双层离子传输，用于分离废水中的稀铅离子
DOI：
10.1016/j.memsci.2017.04.009
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发表时间：
2017-08
影响因子：
9.5
通讯作者：
Guan Guoqing
中科院分区：
文献类型：
--
作者：
Gao Fengfeng;Du Xiao;Hao Xiaogang;Li Shasha;Zheng Junlan;Yang Yanyan;Han Nianchen;Guan Guoqing
采用高导电性多壁碳纳米管（MWCNTs）膜，结合电池电压-脉冲电位耦合电路，在电化学开关离子permselective （ESIP）工艺中连续分离废水中的Pb2+。采用聚四氟乙烯（PTFE）薄膜对MWCNT溶液进行压力过滤，制备了高选择性Pb2+分离膜。在分离系统中，通过调节膜双电层（EDL）上的正负电荷密度，外加外加电场的作用，实现了Pb2+的定向吸收和释放。考察了操作参数对Pb2+通量和膜透性的影响。当电池电压为0.8 V，脉冲宽度为40 s，膜MWCNT含量为30 mg时，Pb2+通过膜的通量最高，且具有相当的perop选择性。该系统将溶液中的Pb2+浓度从30 ppm降低到0.36 ppm，电流效率为46.1%。该新型EDL膜ESIP系统可用于污水处理。
Continuous separation of dilute Pb2+from wastewater was demonstrated by using a membrane containing highly conductive multiwalled carbon nanotubes (MWCNTs) in an electrochemically switched ion permselective (ESIP) process, with a cell voltage–pulse potential coupling circuit. The membrane with high selectivity for Pb2+separation was fabricated by pressure filtering MWCNT solution through a polytetrafluoroethylene (PTFE) film. In the separation system, the directional uptake and release of Pb2+were realized by modulating the positive and negative charge densities on the electrical double layer (EDL) of the membrane, together with the application of an external electric field. The effects of the operating parameters on the flux of Pb2+and membrane permselectivity were investigated. The highest Pb2+flux across the membrane occurred with considerable permselectivity at a cell voltage of 0.8 V, a pulse width of 40 s, and a membrane MWCNT content of 30 mg. The system reduced the Pb2+concentration in the solution from 30 to 0.36 ppm with a current efficiency of 46.1%. Such a novel EDL membrane-based ESIP system could be used for wastewater treatment.
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