DEVELOPMENT OF A NANOSTRUCTURED PHOTO-ELECTROCHEMICAL SENSOR FOR P-NITROPHENOL MONITORING IN SUPPLY WATER

• Grant number: 16/06139-9
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): December 01, 2016
• Effective date (End): January 29, 2021
• Field of knowledge: Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
• Principal researcher: Sergio Antonio Spinola Machado
• Grantee: Camila Domingues Mendonça Verbinnen
• Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated scholarship(s): 18/13724-0 - Development of a photoelectrochemical sensor for the quantification of phenolic contaminants, BE.EP.DR

Abstract

This project proposes to use the photoelectrochemical analysis (photoelectrochemical analysis - PEC) for determination of p-nitrophenol in supply water samples. For this, an ITO surface will be modified with zinc oxide nanorods sensitized with perylene tetracarboxylic acid, for the generation of photocurrent after excitation by light in the visible region. This photosensor will be characterized by morphological techniques (optical microscopy, SEM-FEG, transmission microscopy), by electrochemical techniques (electrochemical impedance, voltammetry, etc.), and optical techniques (absorption in the UV-vis and FTIR). After the characterization, the photosensor will be used to determine p-nitrophenol in laboratory solutions. For this, the increase of the photocurrent observed due to the donation of electrons from p-nitrophenol, will be quantified and a calibration curve constructed. The obtained results from this photosensor will be compared with those from high-performance liquid chromatography. Finally, the photosensor will be employed for the detection and quantification of organophosphorus pesticides (methyl parathion, paraoxon, fenitrothion, etc.) in supply water samples collected in water treatment stations before and after the treatment process. The figures of merit of this methodology will be calculated and compared with traditional techniques for the detection of pesticides these matrices. Thus, the development of a highly sensitive photosensor will develop a new analytical methodology sensitive, with low cost, miniaturization potential, and with the possibility of application "in situ" and in real-time for the determination of toxic pesticides in water to be served to the population.

Scientific publications

(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)

GOMES, NATHALIA O.; MENDONCA, CAMILA D.; MACHADO, SERGIO A. S.; OLIVEIRA, JR., OSVALDO N.; RAYMUNDO-PEREIRA, PAULO A. Flexible and integrated dual carbon sensor for multiplexed detection of nonylphenol and paroxetine in tap water samples. Microchimica Acta, v. 188, n. 10 OCT 2021. Web of Science Citations: 0.

MENDONCA, CAMILA D.; KHAN, SHAHID U.; RAHEMI, VANOUSHE; VERBRUGGEN, SAMMY W.; MACHADO, SERGIO A. S.; DE WAEL, KAROLIEN. Surface plasmon resonance-induced visible light photocatalytic TiO2 modified with AuNPs for the quantification of hydroquinone. Electrochimica Acta, v. 389, SEP 1 2021. Web of Science Citations: 0.

MENDONCA, CAMILA D.; PRADO, THIAGO M.; CINCOTTO, FERNANDO H.; VERBINNEN, RAPHAEL T.; MACHADO, SERGIO A. S. Methylparaben quantification via electrochemical sensor based on reduced graphene oxide decorated with ruthenium nanoparticles. SENSORS AND ACTUATORS B-CHEMICAL, v. 251, p. 739-745, NOV 2017. Web of Science Citations: 6.