Abstract
A double molecular imprinted (DMI) two-dimensional {001} facet oriented TiO2 single crystal photoelectrocatalytic surface was constructed for the preferential and simultaneous removal of two pollutants, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2-(2,4-dichlorophenoxy) propionic acid (2,4-DP). The fabricated photoelectrode showed enhanced removal and selectivity for the targeted pollutants. In a three-component system with 2,4-D, 2,4-DP and natural organic matters, both of the targeted pollutants could be preferentially removed over 90% while the oxidation for non-targeted substances was severely prohibited (only ∼ 66% removal). Furthermore, the detailed adsorption processes of 2,4-D and 2,4-DP on different imprinted electrodes were systematically investigated by both in situ Raman and IR spectroelectrochemical measurements suggesting that the preferential removal originated from the specific adsorption for the targeted molecules with DMI enhancement. This work provides new thoughts for the application of multi-templates molecular imprinted photelectrodes on preferential removal of several highly toxic contaminants with similar structures in complicated coexisting aqueous systems.
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