Removal and real time determination of environmental pollutants using electrochemical photoassisted system

• Grant number: 16/12926-3
• Support type: Regular Research Grants
• Duration: September 01, 2016 - September 30, 2018
• Field of knowledge: Physical Sciences and Mathematics - Chemistry
• Principal Investigator: Fernando Cruz de Moraes
• Grantee: Fernando Cruz de Moraes
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

In this project it is proposed the develop of photo-electrochemical system to remove and real-time monitoring of environmental contaminants in natural water samples. The pollutant removal system as well the real-time monitoring of the concentration of these substances will be based on the mechanism of a semiconductor-mediated photoelectro-oxidation of pollutants. For remediation methodology will be synthesized, characterized and applied photoanodes made of bismuth vanadate. This material, in the presence of light source and potential, have the ability to split the water molecule generating hydroxyl radicals, which oxidize the pollutants molecules, promoting the removal of these species. Subsequently it will be proposed a methodology for the real-time monitoring of pollutants using electrochemical sensors. The sensors are based on reduced graphene oxide-modified metal oxide semiconductors. The synergism between the reduced graphene oxide and the semiconductor nanoparticles will be interesting for the development of photoassisted electrochemical sensors. The gain in sensitivity is due to the fast charge transfer of the system graphene/semiconductor and the low rate of electron/hole recombination that occurs between these materials. In this case, it is possible to create a heterojunction process between the reduced graphene oxide, which can be modulated as a p-type semiconductor, and the semiconductor nanoparticles as n-type. Thus, combining the electrochemical and light energy is expected to increase the method sensitivity, consequently it will be possible the determination of substances with lower limits of detection. In this project the pollutants to be monitored are the endocrine disruptors (antibiotics, hormones, drugs and pesticides) in industrial and domestic effluent samples. Detection of these interferences will occur via direct electrochemical oxidation of the pollutants over the sensor surface. Thus, the development of an electrocatalytic system with highly sensitivity, accuracy, low cost, with potential for miniaturization, and that has the possibility for the implementation of methodology to detect in situ and in real time three endocrine disruptors in environmental matrices, it is very important. (AU)

Scientific publications

(7)

(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)

PRADO, THIAGO M.; CARRICO, AMANDA; CINCOTTO, FERNANDO H.; FATIBELLO-FILHO, ORLANDO; MORAES, FERNANDO C. Bismuth vanadate/graphene quantum dot: A new nanocomposite for photoelectrochemical determination of dopamine. SENSORS AND ACTUATORS B-CHEMICAL, v. 285, p. 248-253, APR 15 2019. Web of Science Citations: 1.

CINCOTTO, FERNANDO H.; FAVA, ELSON L.; MORAES, FERNANDO C.; FATIBELLO-FILHO, ORLANDO; FARIA, RONALDO C. A new disposable microfluidic electrochemical paper-based device for the simultaneous determination of clinical biomarkers. Talanta, v. 195, p. 62-68, APR 1 2019. Web of Science Citations: 4.

SANTOS, ANDERSON MARTIN; WONG, ADEMAR; CINCOTTO, FERNANDO HENRIQUE; MORAES, FERNANDO CRUZ; FATIBELLO-FILHO, ORLANDO. Square-wave adsorptive anodic stripping voltammetric determination of norfloxacin using a glassy carbon electrode modified with carbon black and CdTe quantum dots in a chitosan film. Microchimica Acta, v. 186, n. 3 MAR 2019. Web of Science Citations: 1.

DO PRADO, THIAGO MARTIMIANO; CINCOTTO, FERNANDO HENRIQUE; FATIBELLO-FILHO, ORLANDO; DE MORAES, FERNANDO CRUZ. Bismuth Vanadate/Reduced Graphene Oxide Nanocomposite Electrode for Photoelectrochemical Determination of Diclofenac in Urine. Electroanalysis, v. 30, n. 11, p. 2704-2711, NOV 2018. Web of Science Citations: 1.

CINCOTTO, FERNANDO H.; CARVALHO, DANIEL A. S.; CANEVARI, THIAGO C.; TOMA, HENRIQUE E.; FATIBELLO-FILHO, ORLANDO; MORAES, FERNANDO C. A nano-magnetic electrochemical sensor for the determination of mood disorder related substances. RSC ADVANCES, v. 8, n. 25, p. 14040-14047, 2018. Web of Science Citations: 2.

PRADO, THIAGO M.; CINCOTTO, FERNANDO H.; MORAES, FERNANDO C.; MACHADO, SERGIO A. S. Electrochemical Sensor-Based Ruthenium Nanoparticles on Reduced Graphene Oxide for the Simultaneous Determination of Ethinylestradiol and Amoxicillin. Electroanalysis, v. 29, n. 5, p. 1278-1285, MAY 2017. Web of Science Citations: 6.

SILVA, TIAGO ALMEIDA; MORAES, FERNANDO CRUZ; JANEGITZ, BRUNO CAMPOS; FATIBELLO-FILHO, ORLANDO. Electrochemical Biosensors Based on Nanostructured Carbon Black: A Review. Journal of Nanomaterials, 2017. Web of Science Citations: 42.