以羧甲基纤维素钠（CMC）和壳聚糖（CS）分别作为制备双极膜阳、阴极膜的天然材料，然后分别以18–冠醚–6（18–C–6）和戊二醛（GA）改性，采用流延法制备mCMC +18–C–6/mCS离子印迹双极膜。从含水率、红外、热稳定性、跨膜电压、交流阻抗等方面表征该离子印迹双极膜的性能。测定结果表明，改性后的离子印迹双极膜性能得到提高。并将改性后的离子印迹双极膜应用于宁德市海水中提取钾资源，当渗透时间为150min时，K+透过改性后的离子印迹双极膜的透过率最大，高达95%。

Sodium carboxymethyl cellulose (CMC) and Chitosan (CS) were prepared as natural materials,then modified by 18–crown–6 (18–C–6) and glutaraldehyde (GA), respectively. mCMC+18–C–6/mCS ion imprinted bipolar membrane(IIBPM)was prepared by a paste method.The IIBPM was characterized by moisture content,Infrared Spectroscopy (IR), transmembrane voltage, AC impedance,thermal stability,respectively. The results showed that the property of IIBPM was improved after modified by 18–C–6.mCMC+18–C–6/mCS IIBPM was applied to extract potassium resources in Ningde city. When the penetration time was 150 min, the permeability rate of K+ through the mCMC+18–C–6/mCS IIBPM was up to 95%.

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