Performance of CuAl-LDH/Gr Nanocomposite-Based Electrochemical Sensor with Regard to Trace Glyphosate Detection in Water

• Published in: Sensors (Basel, Switzerland) Vol. 20; no. 15; p. 4146
• Main Authors: Zhang, Chuxuan, Liang, Xinqiang, Lu, Yuanyuan, Li, Hua, Xu, Xiangyang
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 25-07-2020; MDPI
• Subjects: Acids; Banded structure; Chemical sensors; electrochemical detection; Electrodes; Enzymes; Ethanol; Experiments; Fourier transforms; Functional groups; glyphosate; Graphene; layer double hydroxides; Nanocomposites; Nanomaterials; Nitrates; Pesticides; Pollutants; Potassium; sensor; Sensors; Surface water; Voltammetry; China; Japan
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s20154146

Glyphosate, which has been widely reported to be a toxic pollutant, is often present at trace amounts in the environment. In this study, a novel copper-aluminum metal hydroxide doped graphene nanoprobe (labeled as CuAl–LDH/Gr NC) was first developed to construct a non-enzymatic electrochemical sensor for detection trace glyphosate. The characterization results showed that the synthesized CuAl–LDH had a high-crystallinity flowered structure, abundant metallic bands and an intercalated functional group. After mixed with Gr, the nanocomposites provided a larger surface area and better conductivity. The as-prepared CuAl–LDH/Gr NC dramatically improved the enrichment capability for glyphosate to realize the stripping voltammetry detection. The logarithmic linear detection range of the sensor was found to be 2.96 × 10−9–1.18 × 10−6 mol L−1 with the detection limit of 1 × 10−9 mol L−1 with excellent repeatability, good stability and anti-interference ability. Further, the sensor achieved satisfactory recovery rates in spiked surface water, ranging from 97.64% to 108.08%, demonstrating great accuracy and practicality.