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Interface modulation of bacteriogenic Ag/AgCl nanoparticles by boosting the catalytic activity for reduction reactions using Co 2+ ions.
Chemical Communications : Chem Comm 2017 May 3
Boosting the low catalytic activity of bacteriogenic Ag/AgCl nanoparticles (NPs) by adding Co2+ in a model reaction, i.e. p-nitrophenol (PNP) reduction, was observed. Under optimal conditions, Co-Ag/AgCl NPs show an apparent rate constant (kapp ) of 0.0837 s-1 upon PNP reduction. Considering the trace amount of Co-Ag/AgCl NPs used in catalysis (about 1.2 μg), the activity parameter κ (which is the ratio of kapp and catalyst mass) can reach more than 6.97 × 104 s-1 g-1 , which is 214-fold higher than that of pristine Ag/AgCl NPs. Meanwhile, this κ value is also the highest value reported to date. In addition, the biogenic Co-Ag/AgCl NPs exhibit superior catalytic activities over other substrates, such as m-nitrophenol, o-nitrophenol, methyl orange and rhodamine B. The activity enhancement mechanism is supposed to be that Co2+ acts as a Lewis acid, and coordinates with the surface peptides to affect the electric field distribution at the Ag/AgCl NP interface.
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