• Membrane Journal
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• v.30 no.5
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• pp.350-358
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• 2020

A membrane capacitive deionization (MCDI) cell is constructed by applying thin layer of a cation exchange membrane (Nafion) on cathode and an anion exchange membrane (aminated polyphenylene oxide, APPO) on anode. Compared to CDI cell without CEM and AEM coating, MCDI exhibits enhanced salt removal efficiency. When Nafion and APPO are used as CEM and AEM, optimized salt removal performance as high as 82.1% is observed when 1.2 V is applied for 3 min during absorption process and -1.0 V is applied for 1 min during desorption.

• Membrane Journal
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• v.25 no.6
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• pp.488-495
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• 2015

Aminated polyphenylene oxide (APPO) based on polyphenylene oxide (PPO) was synthesized using trimethylamine and chloromethyl ethyl ether. Then, the electro-physical properties of APPO membranes which were prepared from the 8 wt% APPO solution dissolved in chloroform were characterized. Contact angle was $44.4^{\circ}$, swelling degree was 37.9%. The typical electrical properties of ion exchange capacity and ion conductivity were 2.3 meq/g, 0.027 S/cm, respectively. And the single gas permeation experiments were performed by using the time-lag method for $N_2$, $O_2$, $CH_4$, $CO_2$, $SO_2$. For the acid gases of $CO_2$ and $SO_2$, their permeability were measured 20.7 and 511.5 barrers, respectively. In the case of selectivity, $CO_2/CH_4$, $CO_2/N_2$ and $SO_2/CO_2$ were measured 39.8, 42.2, 24.7, respectively.