Synthesis of porous carbon by composing Co-MOF as a precursor for degrading antibiotics in the water

Abstract

Advanced oxidation process (AOPs) has been widely investigated by environmentalists for treating refractory pollutants in the water. Herein, a new composite Co/CoO/C was successfully synthesized via designing cobalt MOF precursor CUST-591 and carbonized under nitrogen condition. The cobalt based MOF precursor CUST-591 formulated as {[Co2(NTB)(DPE)0.5(H2O)2]}·4H2O·DMA, (NTB = 4,4ˊ,4ˊˊ-nitrilotrisbenzoic, DPE = 1, 2-di (4-pyridyl) ethane, DMA= N, N = dimethylacetamide) exhibits a three-dimensional net (3D) with 2-fold interpenetration. During carbonization, porous carbon obtained from MOF ligands embedded Co nanoparticles to form the porous carbon. The fabricated Co/CoO/C possess great property on degrading tetracycline, oxytetracycline with the activation for peroxymonosulfate (KHSO5, PMS) as a heterogeneous catalyst within 20 min under wide range of pH (3∼7). In addition, catalyst dosage, PMS concentration and pollutant amounts were further investigated to prove the advantages of the catalyst. Radical quenching experiments were conducted to discuss the possible mechanism. The experiment results proved that the reactive oxygen species (ROS) were SO4•- and •OH, especially SO4•− played an important role in the reaction. Meanwhile, the catalyst exhibited excellent stability, and can be easily separated from the water by magnet. This prepared material for PMS activation provided a new prospect to synthesize new compounds based on SR-AOPs.