Adsorption and Photocatalytic Properties of Tris(4-aminophenyl)amine-based Polyimide/Graphitic Carbon Nitride Composites for Organic Dye Removal

Adsorption and degradation of harmful organic molecules in aqueous wastewater streams is a considerable challenge, and materials featuring both properties are highly sought after. Tris­(4-aminophenyl)­amine-based polyimide (TP) is well-known for its significant adsorption properties, yet it features limited photocatalytic performance. To overcome this limitation, graphitic carbon nitride (CN) is combined with TP to form TPCN composites in order to improve the adsorption and photocatalytic properties for the degradation of organic molecules. Characterization of TPCN composites via UV–vis diffuse reflectance spectra (DRS) and photoluminescence (PL) showed improved charge separation, slow recombination of electron–hole pairs, and enhanced light absorption. Subsequent analysis of rhodamine B adsorption and photodegradation showed high activity of the composite material (99% degradation under visible light in 40 min), indicating the favorable interaction of both components. Therefore, TPCN composites might be an avenue for the application of organic industrial pollutant removal.