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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photochemiresistor Sensor Development Based on a Bismuth Vanadate Type Semiconductor for Determination of Chemical Oxygen Demand

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Author(s):
Alves, Nayara A. [1] ; Olean-Oliveira, Andre [1] ; Cardoso, Celso X. [2] ; Teixeira, Marcos F. S. [1]
Total Authors: 4
Affiliation:
[1] Sao Paulo State Univ, UNESP, Dept Chem & Biochem, Sch Sci & Technol, BR-19060900 Presidente Prudente, SP - Brazil
[2] Sao Paulo State Univ, UNESP, Dept Phys, Sch Sci & Technol, BR-19060900 Presidente Prudente, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ACS APPLIED MATERIALS & INTERFACES; v. 12, n. 16, p. 18723-18729, APR 22 2020.
Web of Science Citations: 4
Abstract

The present paper describes the development of a novel photochemiresistor sensor for the determination of chemical oxygen demand (COD). A chemiresistive device was produced by a thin film of the monoclinic phase of bismuth vanadate deposited on an FTO glass surface. The resistive properties of the photosensor were carried out by electrochemical impedance spectroscopy (EIS). The electrical resistance of the platform was dependent on the presence of organic material in aqueous solution and the incidence of light. The decrease in resistance can be explained by considering that by increasing the amount of organic material, the amount of charge transferred to BiVO4 increases, as does the amount of the photogenerated conduction band on the film. This behavior is not observed when carrying out the same measurements in the absence of light. Under the optimal experimental conditions, the linear response of the chemiresistor sensor is between 0.20 and 19.9 mg L-1 COD at a fixed AC frequency of 0.1 Hz. There is a good correlation between the charge transfer resistance and COD concentration in the electrolyte solution. Quantification of COD in waste and lake waters was successfully performed using the novel photochemiresistor sensor. The results achieved in the analysis with the sensor are in accordance with the conventional method. (AU)

FAPESP's process: 16/09017-1 - STUDY OF THE FILM FORMATION OF SCHIFF BASE METALLIC COMPLEXES
Grantee:Marcos Fernando de Souza Teixeira
Support Opportunities: Regular Research Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC