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Electron-deficient Ag/TiO2 stabilizes surface hydrogen for nitroaromatic hydrogenation
Shuai Zhu, Zening Li, Xujia Cao, Yuan Lin, Jun Wan*, Mingxia Guo*, Lijun Liu*
https://doi.org/10.1016/j.cjsc.2026.101052
Nitroaromatic; Waste-to-resource conversion; Hydrogen donor; Interfacial electron transfer; d-band upshift
ABSTRACT
The coexistence of formaldehyde (HCHO) and nitroaromatic pollutants in industrial wastewater creates both environmental pressure and an opportunity for waste-to-resource conversion. Herein, electron-deficient Ag/TiO2 nanofibers were developed to couple HCHO transformation with selective nitroaromatic hydrogenation using HCHO as an in situ hydrogen donor. The large work-function mismatch between Ag and TiO2 drives interfacial electron transfer from Ag to TiO2, producing electron-deficient Ag sites with an upshifted d-band center. This electronic reconstruction lowers the kinetic barrier for HCHO dehydrogenation and strengthens Ag–H coupling, thereby stabilizing reactive surface hydrogen species (*H) and suppressing parasitic H2 evolution. Using 4-nitrophenol as a model substrate, the optimized 10%Ag/TiO2 catalyst achieved efficient hydrogenation to 4-aminophenol with a high TOF of 6.42 min-1 and near-unit selectivity, and was further applicable to substituted nitroaromatics including p-chloronitrobenzene and p-nitrotoluene. This work demonstrates that interfacial electron depletion enables the regulation of *H generation, stabilization, and utilization, providing a mechanistic strategy for converting coexisting HCHO and nitroaromatic pollutants into value-added aromatic amines.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1