Two new transition CdII and MnII-based MOFs for highly effective photodegradation antibiotics

Abstract

Two coordination polymers (CPs), [Cd3(L)3(phen)2]n (1) and [Mn(L)(phen)]n (2), [H3L=3,3′-(1,4-phenylenebis(methylenoxy)dibezoic acid] were synthesized via hydrothermal method. 1 features a 2D layered structure with the potential for 3D network formation through weak interactions, 2 exhibits a 1D waved chain capable of forming 3D polymeric chains via intra- or intermolecular hydrogen bonding (OH···O) interactions. Both CPs demonstrate promising photocatalytic activity against antibiotics, including chloramphenicol (CAP), metronidazole (MDZ), nitrofurazone (NFZ), oxytetracycline (OXY), and sulfamethazine (SMZ). Notably, CP 1 shows superior photocatalytic activity for NFZ degradation. Systematic investigations revealed that under optimized conditions, CP 1 achieves a remarkable ∼ 92.21 % photodegradation of NFZ at a concentration of 40 ppm NFZ with a photocatalyst dosage of 25 mg/L within 50 min. Radical quencher experiments identified h+ (positive holes) and O2•- as the primary active species driving the photodegradation process. Additionally, CP 1 maintained consistent performance over five cycles, indicating its stability and reusability for NFZ degradation.