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. 2022 Jun 22;12(29):18373–18396. doi: 10.1039/d2ra02469a

Number of detections of the most frequent by-products for different AOP systems.

Carboxylic acids compounds and small by-products Number of detections Remark Quinone derivatives and aromatic by-products Number of detections Remark References
Acetamide 15 Acetamide one of the most frequent by products in all AOP systems Hydroquinone 43 Is the most frequent by products in all AOP systems 15, 17, 31, 20, 32, 33, 72, 34, 30, 35, 76, 36, 29, 37, 38, 79, 80, 81, 82, 39, 83, 41, 40, 41, 84, 42, 85, 43, 86, 87, 44, 88, 89, 45, 46, 90, 69, 47, 91, 21, 92, 22, 93, 48, 49, 94, 50, 95–99, 27, 51, 52, 58, 53–55 and 100–103
Oxalic acid 14 Detected in all AOP systems except systems that based persulfate and peroxymonosulfate as an oxidant 1,4-Benzoquinone 26 Was detected after treatment of ATC by different AOP systems
Formic acid 10 Detected in all AOP systems except systems that based irradiation as a catalyst 4-Aminophenol 16 Detected in all AOP systems except systems that based persulfate and peroxymonosulfate as an oxidant
Acetic acid 9 Mostly detected after oxidation of ACT by electrooxidation systems 1,2,4-Trihydroxybenzene 5 This by-product was frequently detected after oxidation of ACT by photodegradation systems
Oxamic acid 7 Detected in all AOP systems except systems that based persulfate and peroxymonosulfate as an oxidant 4-Methylbenzene-1,2-diol 2 Only observed after ACT treatment by systems that based persulfate and peroxymonosulfate as an oxidant
Maleic acid 5 Only observed after ACT treatment by systems that photodegradation systems Benzoic acid 2 Benzoic acid frequently detected after electrooxidation of ACT
Malonic acid 2 Mostly detected after oxidation of ACT by electrooxidation systems N-(3,4-Dihydroxyphenyl)formamide 2 Only observed after ACT treatment by systems that based persulfate and peroxymonosulfate as an oxidant
4-Heptanol 2 Mostly detected after oxidation of ACT by electrooxidation systems
Butanoic acid 2
Hydroxyacetone 2
2-(Acetylamino)-2-propenoic acid 2 Only observed after ACT treatment by systems that based persulfate and peroxymonosulfate as an oxidant