“…Acetaldehyde, a 2B carcinogen, is one of the third-class disinfection byproducts of drinking water, and the presence of acetaldehyde pollutants also can be observed in industrial wastewater, exhaust gas, automobile exhaust, and decorative wood . Photodegradation is a prevalent technique for the removal of acetaldehyde pollutants, utilizing semiconductor metal oxides (such as TiO 2 , , WO 3 , and CeO 2 ) as catalysts. Unfortunately, the degradation products primarily consist of CO 2 , HX, and water, and the value-added utilization of acetaldehydes remains unrealized .…”