Abstract
A potential-responsive ion exchange film composed of layered alpha tin phosphate (α-SnP) nanosheets and electroactive poly(acid yellow 9) (PAY) was developed for rapidly removing heavy metal ions. In this composite film, the PAY acts as the potential-sensitive function materials for capturing ions selectively during electrochemically switched ion exchange (ESIX) process, while α-SnP nanosheets work as solid acid materials to provide an acidic microenvironment for maintaining electroactivity of PAY and the interlayer space of α-SnP nanosheets play as the container of target ions. Experiment results reveal that the PAY/α-SnP composite film has excellent performance for removal of Pb2+ ions from wastewater rapidly and selectively. With applied potential of −0.3 V, composite film exhibits a saturated adsorption capacity of Pb2+ ions as high as 27.6 mg/g, and rapid ions uptake rate (uptake amount can reached 90.7% of saturated adsorption capacity during 15 min), which are 3 and 6 times higher as the spontaneous adsorption process. This excellent performance of composite films should be attributed to the synergistic effect of α-SnP and PAY components. This presented ESIX composite film should be valuable for removing Pb2+ions and/or other heavy metal ions from wastewater.
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