Glyphosate: ZnO Nanocrystal Interaction Controlled by pH Changes

The study of the interaction of the herbicide glyphosate with zinc oxide (ZnO) nanocrystals (NCs) was investigated under controlled pH conditions. These changes alter the various chemical groups' vibrational frequencies of the glyphosate molecule according to the infrared spectra. Scanning elec...

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Bibliographic Details
Published in:IEEE sensors journal 2021-09, Vol.21 (18), p.19731-19739
Main Authors: do Valle, Anderson Luis, Silva, Anielle Christine Almeida, Melo, Francielli C. C., de L. Fernandes, Guilherme, de Oliveira, Guedmiller Souza, Dantas, Noelio Oliveira, Rodrigues, Luciano Pereira, Filho, Luiz Ricardo Goulart
Format: Article
Language:English
Subjects:
AFM
Atomic force microscopy
Crystal structure
FTIR
Glyphosate
Gravimetric analysis
Herbicides
Identification methods
II-VI semiconductor materials
Infrared spectra
Microscopy
Nanocrystals
Optics
pH control
Protonation
Scanning electron microscopy
SEM
Sensors
Soil
Zinc
Zinc oxide
Zinc oxides
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Summary:The study of the interaction of the herbicide glyphosate with zinc oxide (ZnO) nanocrystals (NCs) was investigated under controlled pH conditions. These changes alter the various chemical groups' vibrational frequencies of the glyphosate molecule according to the infrared spectra. Scanning electron microscopy (SEM), and atomic force microscopy (AFM) images suggest that the pH changes promote specific conformational changes due to the protonation of glyphosate. Then, the glyphosate is organized as a mycelium around ZnO NCs at neutral pH. Also, as the pH varies from acidic to alkaline, new crystal structures occur, which goes from star-like to volcano-like shapes. For an efficient quantification of glyphosate using ZnO NCs, it is essential to correlate the pH to its method. The acidic medium is recommended for optical methods, while the basic medium is more suitable for gravimetric methods, and neutral pH is ideal for spectroscopic analysis in FTIR and Raman. Therefore, in this study, we demonstrated that tuning pH could change the identification method to improve accuracy.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2021.3099471