Potential risks from UV/H2 O2 oxidation and UV photocatalysis: A review of toxic, assimilable, and sensory-unpleasant transformation products

Water Research
Wen-Long WangHong-Ying Hu

Abstract

UV based advanced oxidation processes (UV-AOPs) that efficiently eliminate organic pollutants during water treatment have been the subject of numerous investigations. Most organic pollutants are not completely mineralized during UV-AOPs but are partially oxidized into transformation products (TPs), thereby adding complexity to the treated water and posing risks to humans, ecological systems, and the environment. While the degradation kinetics and mechanisms of pollutants have been widely documented, there is little information about the risks associated with TPs. In this review, we have collated recent knowledge about the harmful TPs that are generated in UV/H2O2 and UV photocatalysis, two UV-AOPs that have been studied extensively. Toxic and assimilable TPs were ubiquitously observed in more than 80% of UV-AOPs of organic pollutants, of which the toxicity and assimilability levels changed with variations in the reaction conditions, such as the UV fluence and oxidant dosage. Previous studies and modeling assessments showed that toxic and assimilable TPs may be generated during hydroxylation, dealkylation, decarboxylation, and deamination. Among various reactions, TPs generated from dealkylation and decarboxylation were generall...Continue Reading

Citations

Aug 4, 2019·Environmental Science and Pollution Research International·Estefania BraccoRoberto Candal
Nov 22, 2019·Environmental Science and Pollution Research International·Marta GmurekRosa M Quinta-Ferreira
Mar 17, 2019·Environmental Science and Pollution Research International·Wei LiGregory Korshin
Aug 2, 2018·Environmental Science and Pollution Research International·Ning DingFei Qi
Mar 27, 2020·Environmental Science and Pollution Research International·Guixue FengLi Liu
Feb 13, 2021·The Science of the Total Environment·Alan RempelLuciane Maria Colla
Apr 17, 2020·Water Research·Xiujuan KongJingyun Fang
Dec 7, 2018·Environmental Science & Technology·Baotong Zhu, Na Wei
Sep 2, 2021·Environmental Science and Pollution Research International·Luana Rabelo HollandaOsvaldo Chiavone-Filho
Sep 12, 2021·Environmental Science and Pollution Research International·Yiming Fang, Hiroshi Sakai
Mar 7, 2020·The Science of the Total Environment·Sarunas VarnagirisDarius Milcius

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