High sensitive phosphorene and molecular imprinted polymers electrochemical sensor to determine benzene in oilfield-produced water

Author(s)

de Souza, Joao Carlos ; Silva, Joao Pedro ; Zanoni, Maria Valnice Boldrin ; de Andrade, Adalgisa Rodrigues

• Document type: Journal article
• Source: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 12, n. 1, p. 11-pg., 2023-12-26.

Abstract

A new electrochemical sensor based on a carbon screen-printed electrode (CSPE) modified with phosphorene (BP) and PEDOT:PSS (BP-PEDOT:PSS) and molecularly imprinted polymers (MIPs) composed of poly(o-phe-nylenediamine) has been developed and applied to determine low benzene concentrations in oilfield-produced water (OPW). Morphological and electrochemical characterization of the sensor confirmed that the CSPE sur -face was modified with BP-PEDOT:PSS and MIPs. CSPE modification with BP-PEDOT:PSS increased the elec-trochemical current by 24.8%. Under optimized conditions, the sensor presented analytical curves with two linear ranges from 4.0 x 10-8 to 1.0 x 10-7 mol L-1 and from 2.0 x 10-7 to 1.0 x 10-6 mol L-1. The limit of detection, limit of quantification, and sensitivity were 7.4 x 10-9 mol L-1, 2.3 x 10-8 mol L-1, and 36.4 A L mol-1 (n = 3), respectively. The sensor showed good interday and intraday repeatability, with RSD values of 3.4% and 4.9%, respectively. Its stability was excellent, preserving 90.7% of its initial current after storage at room temperature and in contact with the ambient atmosphere for 15 days. The sensor also displayed excellent selectivity for the benzene molecule in the presence of interferents (o-xylene, m-xylene, phenol, and toluene). The proposed method was validated by comparison using the technique of gas chromatography coupled to flame injection detection (GC-FID) and successfully applied to determine benzene in an OPW sample. (AU)

• FAPESP's process: 21/12866-9 - Development of electrochemical sensors used in the electrochemical detection of BTEXs in petroleum wastewater self-fed by a microbial fuel cell: BTEXs detection, treatment and energy production
• Grantee: João Carlos de Souza
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/01134-7 - Electrochemical valorization of glyceol molecule: development of a microbial electrolytic cell (MEC) to produce bio-hydrogen (Bio-H2) and value add products in a pem fuel cell
• Grantee: Adalgisa Rodrigues de Andrade
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants