Degradation of sertraline using a continuous-flow filtration/photocatalysis system based on carbon fiber (PWB-3) modified with WO₃ under LED chip irradiation

Author(s)

Rojas-Mantilla, Hernan Dario ; Irikura, Kallyni ; de Souza, Joao Carlos ; Ayala-Duran, Saidy Cristina ; Gomes, Paulo Clairmont Feitosa de Lima ; Salazar-Gonzalez, Ricardo ; Zanoni, Maria Valnice Boldrin

• Document type: Journal article
• Source: CHEMICAL ENGINEERING JOURNAL; v. 477, p. 15-pg., 2023-11-01.

Abstract

This work describes a filtration/photocatalytic system based on carbon fiber (CF) PWB-3 modified with WO3, to obtain a system capable of simultaneously filtering and degrading sertraline (SER) in simulated and real efflu-ents. The CF was prepared by chemical electrodeposition and subsequent thermal treatment at 450 degrees C. X-ray diffraction patterns of CF/WO3/450 showed characteristic peaks for C and WO3 in monoclinic phase (more photoactive). The material presented broad absorption in UV-Vis range (300-700 nm), and a band gap of 3.6 eV. Scanning electron micrographs showed a thin film (WO3) formation on the CF surface. XPS analysis assigned the species C 1s, O 1s, W (4f, 4f(7/2), 4d(5/2) 4d(3/2)), in addition to an intense peak at 530 eV attributed to metallic bonding (W-O). Modification with WO3 increased BET surface area from 0.20 to 3.1 m(2) g(-1), indicative of mesoporous-type material. Evaluation of the filtration/photocatalysis system under experimental conditions (100 mL, 2.0 mg L-1 SER, pH 5.6, and UV LED irradiation) enabled the optimization of reactor operating pa-rameters. Use of an ideal flow rate of 180 mL min(-1) and a membrane stabilization time of 30 min provided adequate contact between the solid and liquid phases and good mass transfer, achieving concentrations below the limit of detection for simulated and real effluent samples, at 90 and 30 min, respectively. It was shown that HO center dot, O-1(2), O-2 center dot(-), H2O2, and h(+) played an important role in SER degradation, with some degradation products being identified and the main route being hydroxylation, demethylation, and dechlorination reactions. The combined system showed excellent potential for filtration applications, reducing problems associated with encrustation, providing rapid retention, and simplifying the treatment of contaminated water. (AU)

• FAPESP's process: 17/12790-7 - Preparation and characterization of TiO2 nanostructured electrodes modified with metal organic frameworks (MOFs) for application in the preconcentration and reduction of CO2
• Grantee: Kallyni Irikura
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• 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
• FAPESP's process: 22/02991-3 - New analytical strategies to determine chemicals of emerging concern present in environmental, food and biological samples
• Grantee: Paulo Clairmont Feitosa de Lima Gomes
• Support Opportunities: Research Grants - Initial Project
• FAPESP's process: 15/12998-1 - Chromatographic and electroanalytical methods applied in determination of p-toluenediamine and p-aminophenol in oxidative medium used in permanent hair dye.
• Grantee: João Carlos de Souza
• Support Opportunities: Scholarships in Brazil - Doctorate
• 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: 19/13113-4 - Photo (electro) catalysis and photoelectro-fenton processes for emerging contaminants removal from industrial wastewater
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Regular Research Grants