Tóm tắt

Poly(styrene)-co-poly(4-vinyl pyridine)(PS-P4VP) beads were prepared by suspension polymerizationrntechnique. PPI(G2) and PPI(G3) dendrimers were grafted on the surface of PS-P4VP beads and wererntwo types of polymer supports viz., PS-P4VP-PPI(G2) and PS-P4VP-PPI(G3). Further, these above two dif-ferent matrices were used to prepare six types of heterogeneous nanoparticle catalysts viz., PS-P4VP-PPIrn(G2)-AgNPs, PS-P4VP-PPI(G2)-AuNPs, PS-P4VP-PPI(G2)-PdNPs, PS-P4VP-PPI(G3)-AgNPs, PS-P4VP-PPIrn(G3)-AuNPs and PS-P4VP-PPI(G3)-PdNPs and AgNO3, HAuCl3and K2PdCl4as a metal precursor. The pre-pared catalysts were characterized by FTIR, UV–Vis, FESEM/EDAX and HRTEM to find the functional grouprnand surface morphology of the catalysts. The catalytic efficiency of the heterogenous nanoparticle cata-lysts was studied by reduction of trypan blue (TB). The obtained krnobsvalues explain that it to increase therngeneration numbers/active sites have been used to enhance the metal loading. On comparing the Ag, Aurnand PdNPs, the AuNPs immobilized beads are an outstanding catalytic activity because of high reductionrnpotential. Especially, the PPI(G3) dendrimer stabilized AuNPs have higher catalytic efficiency, because thernPPI(G3) dendrimer contains a greater number of surface amino groups stabilized the higher amount ofrnAuNPs and increase the dendrimer generation (PPI(G2)–PPI(G3)) the particle size also reduced