Two thiazolo[5,4-d]thiazole(TzTz)-based donor(D)-acceptor(A) COFs (TPTZ-COF and TBTZ-COF) are synthesized for the photocatalytic degradation of RhB in water. The D-A structure COFs with the weak deficient electron TzTz as an acceptor promotes the separation of photo-generated charge carriers. The rigid structure of TzTz can enhance the π–π and dipole–dipole interactions, which improve the mobility of charge carriers and result in the enhancement of the photocatalytic performance of COFs. Optical and electrical tests show that TBTZ-COF has more efficient electron–hole separation and transfer performance and degrades 99.76% of RhB (10 mg/L) in 60 min under visible light irradiation, while the hydroxyl groups on the TPTZ-COF surface enable the formation of a large number of hydrogen bonds with RhB, so TPTZ-COF exhibits excellent adsorption ability for RhB. Furthermore, TBTZ-COF maintains high photocatalytic activity after five consecutive cycles, making it a promising photocatalyst for the rapid removal of RhB.

Thiazolo[5,4-d]thiazole-Based Covalent Organic Frameworks for the Rapid Removal of RhB