Nanosilver deposited on a porphyrin-benzothiadiazole functionalized nitrogen and sulfur rich porous organic polymer for reduction of 4-nitrophenol

Abstract

Noble metal nanoparticle-immobilizing porous organic polymers have attracted significant interest in chemical and environmental applications due to their excellent catalytic properties and good cyclic utilization. Herein, an imine-linked porphyrin-benzothiadiazole porous organic polymers (PB-POP) loaded nanosilver catalysis system was synthesized, named Ag/PB-POP. 5,10,15,20-tetrakis (para-amino phenyl)-21H,23H-porphyrin and 2,1,3-benzothiadiazole-4,7-dicarboxaldehyde were selected as monomers of porous organic polymers, which possesses rich nitrogen and sulfur as active sites for nanosilver deposition. The resultant Ag/PB-POP exhibited remarkably catalytic reduction performances in the 4-nitrophenol reduction with NaBH 4 , and the Ag/PB-POP with good reusability and chemical stabilities could be easily reused in at least 5 runs without decrease of the catalytic performance. More importantly, Ag/PB-POP has broad substrate catalytic adaptability, which could also catalyze the reduction of other nitroaromatic compounds and organic dyes. These results revealed that the synthetic Ag/PB-POP had the potential to be used as an excellent catalyst for the degradation of organic pollutants in an aqueous solution. • Microwave-assisted synthesis was adopted to prepare N- and S-rich porous organic polymers to immobilize nanosilver. • Abundant nitrogen/sulfur species benefited dispersion and immobilization of nanosilver. • The resultant Ag/PB-POP exhibited remarkably catalytic activity for nitroaromatic compounds reduction. • The Ag/PB-POP exhibit excellent stability and reusability in an aqueous solution.