Glyphosate: ZnO Nanocrystal Interaction Controlled by pH Changes

Autor:	Anderson Luis do Valle, Francielli Cristine Cunha Melo, Anielle Christine Almeida Silva, Guedmiller S. Oliveira, Guilherme L. Fernandes, Noelio O. Dantas, Luiz Ricardo Goulart Filho, Luciano Pereira Rodrigues
Rok vydání:	2021
Předmět:	Inorganic chemistry Infrared spectroscopy chemistry.chemical_element Protonation Zinc symbols.namesake chemistry Nanocrystal symbols Gravimetric analysis Molecule Electrical and Electronic Engineering Fourier transform infrared spectroscopy Raman spectroscopy Instrumentation
Zdroj:	IEEE Sensors Journal. 21:19731-19739
ISSN:	2379-9153 1530-437X
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3d7d15a997d71ad2bff7c2f6b531a60d https://doi.org/10.1109/jsen.2021.3099471 Zobrazit plný text záznamu