Electro-switchable surfaces for heavy metal waste treatment: Study of polyacrylic acid films grafted on gold surfaces |
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Institution: | Chemistry of Surfaces and Interfaces, CEA Saclay, DSM/DRECAM/SPCSI, F-91191, Gif-sur-Yvette Cedex, France |
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Abstract: | This paper focuses on using electrochemical-pH-switchable polymer films as active surfaces for heavy metal waste treatment. Polyacrylic acid (PAA) was grafted at open air and room temperature on gold substrates. As a broad-range chelating material, PAA can capture heavy metal ions at low concentration. The release of the metal ions from the grafted-PAA film was obtained under electro-induced-acidification by applying an anodic potential at the electrode to promote a localized water electrolysis. Such electrochemical-switchable films can be part of a secondary step-treatment after conventional ion exchange process or precipitation for treatment of aqueous effluents in order to reach very low concentration in heavy metal ions without production of secondary effluents. |
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