期刊
SENSORS
卷 20, 期 15, 页码 -出版社
MDPI
DOI: 10.3390/s20154146
关键词
electrochemical detection; glyphosate; layer double hydroxides; sensor
资金
- National Key Science and Technology Project: Water Pollution Control and Treatment [2018ZX07208009]
- National Key Research and Development Program of China [2017YFD0800103]
- General scientific research project of Zhejiang Education Department [188310-542126/010]
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 x 10(-9)-1.18 x 10(-6)mol L(-1)with the detection limit of 1 x 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.
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