Synthesis and PPy loading for enhanced visible-light photocatalytic activity of new POMOFs containing silver chains

Abstract A new polyoxometalate based hybrid compound containing Ag-Ag chain, [Ag 29 (trz) 18 ][SiW V 7 W VI 5 O 40 ] (Ag 29 SiW 12 ), was synthesized by the simple one-step hydrothermal reaction of silver nitrate, 1, 2, 3- triazole (trz), and [SiW 12 O 40 ] 4- polyanion. Single crystal X-ray diffraction analysis shows that the [SiW 12 O 40 ] 4- polyanions as coordinating guests were successfully encapsulated into the metal-organic framework host matrix. The Keggin [SiW 12 O 40 ] n- polyanions as templates and trz molecules as the small and delicate ligands play the decisive factors to the formation of silver chain. In addition, to improve the photocatalytic activity of the new compound Ag 29 SiW 12 , its polypyrrole (PPy) composite (PPy@Ag 29 SiW 12 ) has been prepared and exhibits excellent photocatalytic activity (93.1% for MB and 48.8% for RhB) and selectivity adsorption (16.2 mg/g for MB and 1.60 mg/g for RhB) for organic dyes under the visible light radiation.