Reactivity of hybrid films containing polyoxometalates toward pesticides

• Grant number: 15/24136-4
• Support Opportunities: Regular Research Grants
• Start date: May 01, 2016
• End date: October 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Adriano Lopes de Souza
• Grantee: Adriano Lopes de Souza
• Host Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil

Abstract

Sol gel process is an alternative to prepare hybrid materials with the incorporation of inorganic component inside of porous in the organically modified silicate (ormosil) matrix. A second manner to produce hybrid materials is through electrostatic layer-by-layer self-assembly technique where multilayers films can be obtained alternating cationic and anionic species. The purpose of the present project is to investigate electrochemical reactivity of organic inorganic hybrid films, produced by these two forms, containing a Keggin type polyoxometalate (POM) toward two pesticides: ametryn and hexazinone. Two POMs will be tested: phosphomolybdic acid and silicic tungstate acid. Cyclic voltammetry and differential pulse voltammetry are two electrochemical techniques chosen to explore the electrochemical reactivity of the films. Nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy will be used to characterize ormosil samples in powder form. In addition, we use Polarization Modulated infra-red reflexion absorption spectroscopy and ultraviolet-visible spectroscopy to probe the films produced. Morphological features from the hybrid films can be explored using Scanning Electronic Microscopy. With the results obtained here, it is hoped to develop hybrid materials able to detect pesticides. This project aims to start the researches activities of the proponent in the Center for Agricultural Science from Federal University of São Carlos (UFSCar) where he is recently Assistant Professor. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

NASCIMENTO, JONATAS U.; ZAMBUZI, GIOVANA C.; FERREIRA, JOAO O.; PAULA, JULIA H.; RIBEIRO, TATIANA S.; SOUZA, ADRIANO L.; DREISS, CECILE A.; SILVA, LUCIMARA L.; FRANCISCO, KELLY R.. A simple process to tune wettability of pectin-modified silanized glass. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, v. 577, p. 67-74, SEP 20 2019. (17/20006-4, 18/12146-3, 15/24136-4, 16/21616-8)

SOUZA, ADRIANO L.; OLIVEIRA, OSVALDO N.. Dominant hydrophobic interactions with beta-glucan in nanoarchitectonics with mixed Langmuir monolayers of cholesterol/dipalmitoyl phosphatidyl choline. BIOINTERPHASES, v. 17, n. 3, p. 7-pg., 2022-05-01. (15/24136-4, 18/22214-6)

VICTÓRIA DE OLIVEIRA MARGARIDO; JULIA HELENA DE PAULA; KELLY ROBERTA FRANCISCO; ADRIANO LOPES DE SOUZA. Atividade eletrocatalítica de um filme de ormosil híbrido contendo ácido fosfomolíbdico para o herbicida prometon. MATERIA-RIO DE JANEIRO, v. 25, n. 4, 2020-12-11. (17/20006-4, 16/21616-8, 18/05200-1, 15/24136-4)

OLIVIO, PEDRO H. P.; CORREIA, LEONARDO A.; PAULA, JULIA H.; OLIVEIRA, JR., OSVALDO N.; SOUZA, ADRIANO L.. Exploring electrochemical reactivity toward ametryn of hybrid silicate films with phosphomolybdic acid. MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, v. 229, p. 13-19, MAR 2018. (13/14262-7, 15/24136-4)