A selective electroanalysis and photocatalytic removal strategy for pesticide residues using urchin-like LaPO4@Ag. (1st April 2022)

• Record Type: Journal Article
• Authors: Wan, Yuqi; Chen, Xi; Li, Shuai; Yin, Mengyuan; Zhang, Wenwen; Mao, Guojiang; Wu, Choufei; Wang, Hua
• Is Part Of: Electrochimica acta. Volume 410(2022)
• Publication Date: 2022-04-01
• Subjects: LaPO4@Ag nanocomposites -- Sunlight-driven photocatalysis -- Electroanalysis -- Adsorption removal -- Pesticide residues; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.140039
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: LaPO4 @Ag was fabricated with high conductivity and visible-light-driven photocatalysis. The nanocomposites were applied as electrochemical probes and photocatalytic adsorbents Selective electroanalysis for phoxim was expected at the potentials approaching to zero. Photocatalytic removal of pesticides was realized with the efficiency up to 95.7%. The enhanced photocatalysis might be attributed to the constructed Z-scheme strategy. Abstract: Urchin-like LaPO4 was fabricated and further deposited with silver through the citric acid-templated self-assembly and reduction, yielding LaPO4 @Ag to serve as the electrochemical probes and photocatalytic adsorbents for pesticide residues of phoxim (Phox). It was discovered that the LaPO4 @Ag-modified electrodes could allow for the signal output of Ag/AgCl electrochemistry at the low potential approaching to zero, which could rationally decrease in the presence of sulfide-containing Phox. A selective electroanalysis method was further developed for sensing Phox in vegetables with the linear concentrations range of 0.10–600 μM. Moreover, the LaPO4 @Ag adsorbent with large surface-to-volume area could present the white light-driven photocatalysis for the removal of Phox under sunlight with the efficiencies up to 95.7%, due to the Z-scheme strategy constructed by the silver deposition on LaPO4 . Importantly, this citric acid-templated self-assembly and reduction strategy may promise the wide applications for designing of various silver-doped catalytic materials of multiple functions of electrocatalysis, photocatalysis, and absorption.