K-g-C3N4@PDA nanozyme for the colorimetric detection of ferric ammonium citrate in edible salt

IF 2.5 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

New Journal of Chemistry Pub Date : 2025-08-20 DOI:10.1039/D5NJ02041G

Limei Yang, Ye Liu, Rongxue Wang, Linqian Hou and Yaling Yang

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Abstract

A K-doped carboxylated polydopamine (PDA) modification of the g-C₃N₄ (K-g-C₃N₄@PDA) nanozyme was effectively performed by one-step potassium salt-assisted thermal copolymerization and hydrothermal strategies. K-g-C₃N₄@PDA showed excellent peroxidase (POD)-like activity, and ferric ammonium citrate (FAC) efficiently promoted the generation of hydroxyl radicals (˙OH). Furthermore, K-g-C₃N₄@PDA oxidized 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in the presence of H₂O₂ to produce a blue-green product, and FAC boosted the POD-like activity with an exceptional linear relationship and low detection limit (0.018 μg mL⁻¹). Importantly, a recovery rate of 94.09–105.17% was attained when the developed method was effectively used to assess FAC in culinary salt samples using a spiking procedure.

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K-g-C3N4@PDA用于食用盐中柠檬酸铁铵比色检测的纳米酶

通过一步钾盐辅助热共聚和水热策略，对g-C3N4 （K-g-C3N4@PDA）纳米酶进行了k掺杂羧化聚多巴胺（PDA）修饰。K-g-C3N4@PDA表现出优异的过氧化物酶（POD）样活性，柠檬酸铁铵（FAC）有效促进羟基自由基（˙OH）的生成。此外，K-g-C3N4@PDA在H2O2存在下氧化2,2 ' -氮基-双（3-乙基苯并噻唑啉-6-磺酸）（ABTS）生成蓝绿色产物，FAC提高了pod样活性，且呈良好的线性关系，检出限低（0.018 μg mL−1）。重要的是，该方法可有效地应用于食用盐样品中FAC的测定，回收率为94.09 ~ 105.17%。

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