Contents lists available at ScienceDirect Chemical Engineering Journal journal homepage: www.elsevier.com/locate/cej Review Impact of water matrix on the removal of micropollutants by advanced oxidation technologies Ana R. Lado Ribeiro a, ⁎ , Nuno F.F. Moreira a , Gianluca Li Puma b, ⁎ , Adrián M.T. Silva a a Laboratory of Separation and Reaction Engineering – Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal b Environmental Nanocatalysis & Photoreaction Engineering, Department of Chemical Engineering, Loughborough University, Loughborough, United Kingdom HIGHLIGHTS • The infuence of water matrix on the efciency of AOTs is overviewed. • Photolysis, photocatalysis, UV/H 2 O 2 -, Fenton-, and O 3 -based processes are reviewed. • Dissolved organic matter and in- organics can act as inhibitors and/or promoters. • The efect results from the interplay of the co-existing substances. • The knowledge on the role of matrix constituents is crucial for installation of AOTs. GRAPHICAL ABSTRACT ARTICLE INFO Keywords: Advanced oxidation processes Chemical oxidation technologies Contaminants of emerging concern Matrix efect Micropollutants Wastewater constituent ABSTRACT Micropollutants (MPs) in the aquatic compartments are originated from many sources and particularly from the efuents of urban wastewater treatment plants (UWWTPs). Advanced oxidation technologies (AOTs) usually applied after biological processes, have recently emerged as efective tertiary treatments for the removal of MPs, but the oxidation rates of the single compounds may be largely afected by the constituent species of the water matrix. These species include dissolved organic matter and inorganic species (e.g., carbonate, bicarbonate, ni- trite, sulphate, chloride). This review analyses the impact of such substances on common AOTs including photolysis, UV/H 2 O 2 , Fenton, photocatalysis, and ozone-based processes. The degradation efciency of single MPs by AOTs results from the combined impact of the water matrix constituents, which can have neutral, inhibiting or promoting efect, depending on the process and the mechanism by which these water components react. Organic species can be either inhibitors (by light attenuation; scavenging efects; or adsorption to catalyst) or promoters (by originating reactive oxygen species (ROS) which enhance indirect photolysis; or by re- generating the catalyst). Inorganic species can also be either inhibitors (by scavenging efects; formation of radicals less active than hydroxyl radicals; iron complexation; adsorption to catalyst or decrease of its efective surface area) or promoters (e.g., nitrate ions by formation of ROS; iron ions as additional source of catalyst). The available data reviewed here is limited and the role and mechanisms of individual water components are still not completely understood. Further studies are needed to elucidate the wide spectrum of reactions occurring in complex wastewaters and to increase the adoption of AOTs in UWWTPs. https://doi.org/10.1016/j.cej.2019.01.080 Received 19 October 2018; Received in revised form 12 January 2019; Accepted 15 January 2019 ⁎ Corresponding authors. E-mail addresses: ritalado@fe.up.pt (A.R. Lado Ribeiro), G.Lipuma@lboro.ac.uk (G. Li Puma). Chemical Engineering Journal 363 (2019) 155–173 Available online 18 January 2019 1385-8947/ © 2019 Elsevier B.V. All rights reserved. T