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Visualizing Hydrogen Nanobubbles Generation at Nanoscale Zero-valent Iron/Water Interfaces

delete2026-04-18
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OA
AI
S
Shuangjia Shi
Q
Qing Huang
W
Wei-Xian Zhang
L
Lijuan Zhang
A
Airong Liu
DOI：10.1039/D6EN00180Gdelete
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Abstract

Abstract

En 中文
Nanobubbles (NBs) possess unique interfacial and physicochemical properties; however; their formation in reactive metal-water systems still lacks convincing in-liquid; nanoscale-resolved evidence. Here we visualize hydrogen nanobubbles (HNBs) generation during anaerobic aqueous corrosion of nanoscale zero-valent iron (nZVI) using a light-based scattering; synchrotron imaging and interfacial microscopy. Laser Tyndall scattering and nanoparticle tracking analysis reveal a population of rapidly moving nanoscale scatterers in 0.22 μm-filtered nZVI-H2O reaction filtrates; these signals are negligible in ethanol controls and markedly diminished after freeze-vacuum degassing; supporting a gaseous origin for the dispersible entities. To localize these scatterers at reactive interfaces; in-liquid scanning transmission X-ray microscopy at the O K-edge resolves discrete circular; high-transmission voidlike features adjacent to nZVI aggregates in water but not in ethanol; providing nanoscale visualization of interfacial gas domains. Time-resolved liquid-phase scanning electron microscopy and atomic force microscopy further show that these low-density/low-stiffness domains emerge rapidly and accumulate at the Iron/Water interface. Finally; cyclic voltammetry and electron paramagnetic resonance spin trapping link gas-domain formation to sustained hydrogen evolution with transient hydrogen-associated intermediates during aqueous corrosion. Together; these results establish aqueous nZVI corrosion as an intrinsic generator of nanobubbles; expanding iron reactivity from classical solid-liquid pathways to coupled gas-liquid-solid interfacial processes with implications for groundwater remediation.
Keywords:
Hydrogen nanobubbles
Nanoscale zero-valent iron
Interfacial gas domains
Aqueous corrosion
Scanning transmission X-ray microscopy

Journal

E
Environmental Science: Nano
IF:
0
Papers:
284
Citations:
6

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