Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 424, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127378
Keywords
Self-templating; Carbon-confined Ni; NiO; Electrochemical oxidation; Diphenylamine; Differential pulse voltammetry
Categories
Funding
- Ministry of Science and Technology of Taiwan [MOST 106-2221-E-027-034, MOST 109-2222-E-027-004]
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Toxic substances in food pose a health hazard to consumers, leading to a need for simple and cost-effective analytical methods to ensure food safety. Researchers successfully detected DPA using double-shelled C@Ni/NiO hollow microspheres with excellent electrochemical performance, showing good selectivity and stability, suitable for fruit samples.
Toxic substances, such as heavy metals, toxins, pesticides, pathogens, and veterinary drug residues in food are hazardous to consumer health. The variety and quantity of food consumption have increased owing to developments in the agricultural and food industries. Food safety has a substantial socioeconomic impact, and an increasing number of consumers have become aware of its importance. Therefore, simple and cost-effective analytical methods are required to quantify the safety of preservatives. Herein, we report an electrochemical method using double-shelled carbon-confined Ni/NiO (C@Ni/NiO) hollow microspheres to detect diphenylamine (DPA). The microspheres were synthesized by a self-templating hydrothermal method followed by calcination. The hydrothermal temperature and precursor ratio were optimized systematically to prepare doubleshelled C@Ni/NiO hollow microspheres. The excellent electrocatalytic activity and electron transport properties of a C@Ni/NiO-modified glassy carbon electrode (GCE) were exploited in the electrochemical oxidation of DPA. Interestingly, the engineered C@Ni/NiO/GCE has a wide dynamic linear range (0.02-473 mu M) and a DPA detection limit of 0.007 mu M. In addition, the DPA sensor exhibited good selectivity, reproducibility, repeatability, and stability. The practical feasibility of the DPA sensor was evaluated in fruit samples (sweet tomatoes, apples, and red grapes), with considerable recovery.
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