2,2’‐Bipyridine‐Derived Cobalt‐Based Porous Coordination Polymers for Selective Degradation of Anionic Dyes

2,2’-bipyridine-derived cobalt-based two coordination polymers effectively catalyse the degradation of anionic dyes in the presence of NaBH₄. These coordination polymers showed retention of catalytic activity for more than five cycles and are promising materials for the selective degradation of anionic dyes.

Abstract

2,2’-Bipyridine-derived two chelating linkers containing two and three bipyridine units were synthesized and characterized. Solvothermal condensation of these linkers with Co(NO₃)₂.6H₂O generated cobalt-based porous coordination polymers (Co-PCPs). The scanning electron microscopy studies revealed the macroporous nature of the Co-PCPs, with the highest surface area achieved up to 441.1 m² g⁻¹. The Co-PCPs were found to be effective catalysts in the degradation of the anionic dyes, methyl orange (MO) and orange 2 (OII), in the presence of sodium borohydride. Also, the synthesized PCPs were found to selectively catalyse the degradation of anionic dyes from a mixture of dyes (~99 % degradation in 55 min). Regeneration studies showed that the PCPs could be regenerated and reused for more than five cycles with ~98 % retention of degradation efficiency and are promising materials for the selective degradation of anionic dyes from wastewater.

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