Surfactant-Assisted Synthesis of Praseodymium Orthovanadate Nanofiber-Supported NiFe-Layered Double Hydroxide BifunctionalCatalyst: The Electrochemical Detection and Degradation of Diphenylamine

Physiological storage disorders are caused byineffective post-harvest handling of horticultural crops, particularlyfruits. To address these post-harvest concerns, diphenylamine(DPAH center dot+) is widely used as a preservative to prevent fruitdegradation and surface scald during storage around the world.Humans are negatively affected by the use of high concentrationsof DPAH center dot+because of the various health complications related toits exposure. As a result, accurate detection and quantification ofDPAH center dot+residues in treated fruits are critical. Rare earth metalorthovanadates, which have excellent physical and chemicalproperties, are potential materials for electrochemical sensors inthis area. Herein, we present a simple and direct ultrasonicationtechnique for the surfactant-assisted synthesis of praseodymiumorthovanadate (PrVO4or PrV) loaded on nickel iron layered double hydroxide (NiFe-LDH) synthesized with deep eutectic solventassistance, as well as its application as an effective catalyst in the detection and degradation of DPAH center dot+in fruits and water samples.The current work presents supreme electrochemical features of a PrV@NiFe-LDH-modified screen-printed carbon electrode(SPCE) where cetyltrimethylammonium bromide (CTAB) surfactant-driven fabrication of PrV directs the formation of highlyqualified engineered structures and the deep eutectic solvent based green synthesis of NiFe-LDH creates hierarchical lamellarstructures following the principles of green chemistry. PrV and NiFe-LDH combine to produce a synergistic effect that improves thenumber of active sites, charge transfer kinetics, and electronic conductivity. Differential pulse voltammetry analysis of PrV@NiFe-LDH/SPCE reveals a dynamic working range (0.005-226.26 mu M), increased sensitivity (133.13 mu A mu M-1cm-2), enhancedphotocatalytic activity, and low detection limit (0.001 mu M), which are considered significant when compared with the formerreported electrodes in the literature for the determination of DPAH?+for its real-time applications

Automated summary

This study presents a surfactant-assisted synthesis technique for the fabrication of a modified electrode, which is used for the detection and degradation of DPAH center dot+ residues in fruits and water samples. The modified electrode exhibits a wide working range, high sensitivity, enhanced photocatalytic activity, and low detection limit.