Photodegradation of metoprolol using a porphyrin as photosensitizer under homogeneous and heterogeneous conditions
authors Neves, CMB; Filipe, OMS; Mota, N; Santos, SAO; Silvestre, AJD; Santos, EBH; Neves, MGPMS; Simoes, MMQ
nationality International
journal JOURNAL OF HAZARDOUS MATERIALS
author keywords Photodegradation; Photocatalysis; Metoprolol; Porphyrin; Wastewater
keywords ASSISTED PHOTOCATALYTIC OZONATION; SINGLET OXYGEN; PHOTODYNAMIC THERAPY; ORGANIC POLLUTANTS; DEGRADATION; TIO2; WATER; INACTIVATION; PHARMACEUTICALS; IDENTIFICATION
abstract Porphyrins are known as effective photosensitizers and can be an interesting key in phototreatment of water contaminated with micropollutants such as pharmaceuticals. They already showed to be efficient photocatalysts for the degradation of dyes, chlorophenols and other pollutants. This work demonstrates the applicability of 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (H2TF5PP) as photosensitizer for treatment of water contaminated with metoprolol, a highly prescribed beta-blocker, which is not completely removed in sewage treatment plants. Studies were firstly developed under homogeneous conditions with simulated solar radiation and porphyrin was found to be efficient in the photodegradation of metoprolol, following a pseudo-first order kinetics with ca. 90% metoprolol degradation after 12 h. Experiments in presence of scavengers confirmed the mechanism of degradation via singlet oxygen. Appearance of several new peaks in HPLC chromatograms indicates the formation of products, identified by HPLC-MSn. Furthermore, the porphyrin was immobilized on a silica support and used as heterogeneous photocatalyst in degradation of metoprolol. Experiments using this heterogeneous photocatalyst under real solar irradiation were also performed, and similar results were obtained. Kinetic comparison of metoprolol photodegradation in buffer solution and in real wastewater treatment plant effluent showed that the efficiency of the immobilized porphyrin was not decreased by the complex matrix of the effluent.
publisher ELSEVIER SCIENCE BV
issn 0304-3894
year published 2019
volume 370
beginning page 13
ending page 23
digital object identifier (doi) 10.1016/j.jhazmat.2018.11.055
web of science category Engineering, Environmental; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000464483100003
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