Abstract
Metal-organic frameworks (MOFs) have been extensively used as modified materials of electrochemical sensors in the food industry and agricultural system. In this work, two kinds of copper-based MOFs (Cu-MOFs) with a two dimensional (2D) sheet-like structure and three dimensional (3D) octahedral structure for H2O2 detection were synthesized and compared. The synthesized 2D and 3D Cu-MOFs were modified on the glassy carbon electrode to fabricate electrochemical sensors, respectively. The sensor with 3D Cu-MOF modification (HKUST-1/GCE) presented better electrocatalytic performance than the 2D Cu-MOF modified sensor in H2O2 reduction. Under optimal conditions, the prepared sensor displayed two wide linear ranges of 2 μM–3 mM and 3–25 mM and a low detection limit of 0.68 μM. In addition, the 3D Cu-MOF sensor exhibited good selectivity and stability. Furthermore, the prepared HKUST-1/GCE was used for the detection of H2O2 in milk samples with a high recovery rate, indicating great potential and applicability for the detection of substances in food samples. This work provides a convenient, practical, and low-cost route for analysis and extends the application range of MOFs in the food industry, agricultural and environmental systems, and even in the medical field.
Highlights
Hydrogen peroxide (H2O2) is widely used in the food industry, medical field, textile industry, and paper industry (Zhang and Chen, 2017)
3D Cu-Metal-organic frameworks (MOFs)/glassy carbon electrode (GCE) (HKUST-1/GCE) had two wide linear ranges of 2 μM–3 mM and 3–25 mM, and the limit of detection (LOD) was 0.68 μM with high sensitivity and selectivity. Based on these satisfactory results, the HKUST-1/GCE was successfully used for detecting H2O2 in milk samples. These results indicated the influences of structures and morphology of MOFs in electrochemical catalysis and made a great difference in the detection of substances
The mirrorlike GCE was dried in nitrogen stream for use. 1 mg of 2D CuMOF or 3D Cu-MOF was dispersed in the solution containing ultrapure water and 5% Nafion solution (V: V 2:0.004). 6 μL of
Summary
Hydrogen peroxide (H2O2) is widely used in the food industry, medical field, textile industry, and paper industry (Zhang and Chen, 2017). A metal-organic framework (MOF) is a crystalline porous material constructed by coordination of metal ions or clusters with polytopic organic ligands (Furukawa et al, 2013) They possess many promising features like tunable structures, active sites, rapid electron transmission, and high surface area (Lee et al, 2009; Gu et al, 2014). Based on these satisfactory results, the HKUST-1/GCE was successfully used for detecting H2O2 in milk samples These results indicated the influences of structures and morphology of MOFs in electrochemical catalysis and made a great difference in the detection of substances. It pointed out the significance of investigating the morphology of MOFs for further exploring and studying the mechanism
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