Degradation of contaminants of emerging concern in a secondary effluent using synthesized MOF-derived photoanodes: A comparative study between photo-, electro- and photoelectrocatalysis. (February 2023)

• Record Type: Journal Article
• Authors: Candia-Onfray, Christian; Irikura, Kallyni; Calzadilla, Wendy; Rojas, Susana; Boldrin Zanoni, Maria Valnice; Salazar, Ricardo
• Is Part Of: Chemosphere. Volume 315(2023)
• Publication Date: 2023-02
• Subjects: MOF-Derived photoanode -- Photoelectrochemical degradation -- Contaminants of emerging concern -- Secondary effluent -- Hydroxyl radical; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.137683
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Three metal-organic framework (MOF)-based photoanodes were prepared by deposition on TiO2 nanotubes using Ti as substrate (Ti/TiO2 NT): i) Ti/TiO2 NT-Au@ZIF-8, ii) Ti/TiO2 NT-Ru3 (BTC)2, iii) Ti/TiO2 NT-UiO-66(Zr)NH2 . These photoanodes were characterized by FEG-SEM, EDX and DRX. The analyses showed a successful modification and a high homogeneity of the different MOFs on the Ti/TiO2 NT surface. The photoanodes were studied in the degradation of Contaminants of Emerging Concern (CECs) in a spiked secondary effluent from a Municipal Wastewater Treatment Plant (MWWTP). Sodium diclofenac (DCF), sulfamethazine (SMT) and carbamazepine (CBZ) were used as CECs at low concentration (200 μg/L each CEC). The samples were preconcentrated using Solid Phase Extraction (SPE) and analyzed by a HPLC-DAD system. The MOF-based photoanodes exhibited a high photoelectrochemical (PEC) activity towards the oxidation of CECs, achieving up to 50%, 70% and 80% of removal using Ti/TiO2 NT-Au@ZIF-8, Ti/TiO2 NT-UiO-66(Zr)NH2, Ti/TiO2 NT-Ru3 (BTC), respectively. The influence of the generation of hydroxyl radical was then studied. The results indicate that PEC degradation using Ti/TiO2 NT-Ru3 (BTC)2 and Ti/TiO2 NT-UiO-66(Zr)NH2 is more affected by the concentration of the radical. Graphical abstract: Image 1 Highlights: MOF-derived photoanodes using Ti/TiO2 as support and semiconductor were prepared for water treatment. Photoanodes were used to the photo(electro)chemical degradation of organic pollutants in a secondary effluent. More than 90% of sodium diclofenac, sulfamethazine and carbamazepine were degraded by photoelectrocatalysis.