Abstract
The ambitious “zero pollution” goal entails the upgrade of conventional (waste)water treatment processes. Among various options, photo-based advanced oxidation processes (photo-AOPs) have shown promising capabilities in terms of eliminating contaminants of emerging concern. While photo-AOP applications exist worldwide, some key issues remain that hamper their wider practice and achieving the potential zero pollution goal. In this perspective, we briefly summarize the state of photo-AOPs, including photo-hydrogen peroxide (H2O2), -Fenton, -persulfate (S2O82- ), -ozone (O3 ), and -catalysis systems. We also discuss the major theoretical and technical knowledge gaps of photo-AOPs, which require further research to advance these treatments and to progress towards zero-toxic discharge for safe water reuse.
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