Ni Nanoparticles Supported Over Triazine Based Porous Organic Polymer for Selective CO<sub>2</sub> Photo‐Reduction to Methanol
Dip Kumar Nandi, Jhumur Seth, Pekham Chakrabortty, Swarbhanu Ghosh, Avik Chowdhury, Asim Bhaumik, Sk. Manirul Islam
Abstract
Abstract Porous organic polymers (POPs) have attracted substantial attentions over the years due to their exceptionally high specific surface areas, high chemical stability of the organic network and ease of surface functionalization with the desired organic groups. In this work, a triazine based POP (TrzPOP) was synthesized through Schiff base polycondensation reaction between a tetramine bearing triazine rings and phenolic–OH group rich dialdehyde. Ni nanoparticles (NiNP) synthesized independently were immobilized over TrzPOP to obtain the NiNP@TrzPOP composite catalyst. This TrzPOP possesses a high BET surface area of 1494 m 2 g −1 and low band gap, which facilitates its role as visible light absorbent. NiNP@TrzPOP with N‐rich surfaces and phenolic–OH moieties displayed excellent photocatalytic activity in the CO 2 photoreduction under mild reaction conditions. NiNP@TrzPOP composite selectively reduces CO 2 to methanol. The turn over number (TON) for this photoreduction of CO 2 under optimized reaction conditions is 270, which is considerably high comparing to other reported photocatalytic systems. Moreover, NiNP@TrzPOP composite catalytic system showed high recycling efficiency without noticeable decrease in its performance over five consecutive reaction cycles, suggesting its huge potential for large‐scale methanol synthesis from the renewable carbon source.