Abstract
The detection of low-concentration hydrogen peroxide (H2O2) has important theoretical-significance and practical value in many fields, such as medical science, biological chemistry, and food safety inspection. Traditional commercial H2O2 test paper and detection technology can only reach the detection limit of 10−3–10−5 (mass fraction). In this paper, we report a simple method to prepare 2D MOF (metal-organic frameworks) [Co3(HOB)2]n films based on Langmuir-Blodgett (LB) method combined with layer-by-layer growth technique. Even 3-layer [Co3(HOB)2]n films can realize the lowest H2O2 detection limit of 1.05 × 10−8 wt% (3.08 nmol·L−1) based on the resultant 2D MOF catalyst. Meanwhile, density functional theory (DFT) calculations revealed that Co2+ ions of the LB films decreased the energy of [HOOH] transforming into [HO2] during the H2O2 reduction reactions, thus speeding up the decomposition of H2O2.
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