Peptide-directed Pd-decorated Au and PdAu nanocatalysts for degradation of nitrite in water.

ABSTRACT: In this work, a palladium binding peptide, Pd4, has been used for the synthesis of catalytically active palladium-decorated gold (Pd-on-Au) nanoparticles (NPs) and palladium-gold (Pd _x Au_100-x ) alloy NPs exhibiting high nitrite degradation efficiency. Pd-on-Au NPs with 20% to 300% surface coverage (sc%) of Au showed catalytic activity commensurate with sc%. Additionally, the catalytic activity of Pd _x Au_100-x alloy NPs varied based on palladium composition (x = 6-59). The maximum nitrite removal efficiency of Pd-on-Au and Pd _x Au_100-x alloy NPs was obtained at sc 100% and x = 59, respectively. The synthesized peptide-directed Pd-on-Au catalysts showed an increase in nitrite reduction three and a half times better than monometallic Pd and two and a half times better than Pd _x Au_100-x NPs under comparable conditions. Furthermore, peptide-directed NPs showed high activity after five reuse cycles. Pd-on-Au NPs with more available activated palladium atoms showed high selectivity (98%) toward nitrogen gas production over ammonia.

SUBMITTER: Mosleh I 

PROVIDER: S-EPMC9042164 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature