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- W2093725828 abstract "Evidence is presented for the surface mechanism of molecular recognition between 2-aminophenol and hematite in a process involving aminophenol −OH and −NH2 groups. The aim of the present study was to correlate the adsorption of some aminophenols on hematite with the degradation features observed in the dark or in the light. The hydroxyl group in the ortho position was observed to be a preferred position for chelation compared to the meta or para positions. Chelation was detected by diffuse reflectance Fourier transform infrared spectroscopy (DRIFT). Both the −NH2 and −OH groups participate in the adsorption of aminophenol onto hematite. The bridging bidentate formation during the adsorption of 2-aminophenol is supported by the simultaneous shifts of the vibrational frequencies of CC from 1513 to 1501 cm-1 and from 1403 to 1395 cm-1. The matching of atomic distances between Fe−Fe bonds in the α-Fe2O3 crystal and the N−O bond in 2-AP allows for the formation of the bridged bidentate structure. Evidence was found that adsorption enhances degradation in dark processes. The degradation of aminophenols in the dark produced long-lived intermediates that precluded further degradation. Acceleration of the degradation was observed during a photochemically induced charge-transfer process. Highly oxidative radicals generated only under light significantly increased the degradation efficiency of 2-AP and 4-AP. The degradation of 2-aminophenol on hematite proceeded more favorably than the degradations of 3- and 4-aminophenol because of the formation of a strong surface complex between 2-aminophenol and hematite that facilitates charge transfer to the oxide surface." @default.
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- W2093725828 date "2001-05-30" @default.
- W2093725828 modified "2023-10-16" @default.
- W2093725828 title "Surface Mechanism of Molecular Recognition between Aminophenols and Iron Oxide Surfaces" @default.
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- W2093725828 doi "https://doi.org/10.1021/la001411w" @default.
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