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The thermo-acidophilic archaeon, Sulfolobus tokodaii was utilized for the production of20 Pd(0) bionanoparticles from acidic Pd(II) solution. Use of active cells was essential to form well- dispersed ...Pd(0) nanoparticles located on the cell surface. The particle size could be manipulated22 by modifying the concentration of formate (as electron donor; e-donor) and by addition of23 enzymatic inhibitor (Cu2+) in the range of 14-63 nm mean size. Since robust Pd(II) reduction24 progressed in pre-grown S. tokodaii cells even in the presence of up to 500 mM Cl-, it was possible25 to conversely utilize the effect of Cl- to produce even finer and denser particles in the range of 8.7-26 15 nm mean size. This effect likely resulted from the increasing stability of anionic Pd(II)-chloride27 complex at elevated Cl- concentrations, eventually allowing involvement of greater number of28 initial Pd(0) crystal nucleation sites (enzymatic sites). The catalytic activity (evaluated based on29 Cr(VI) reduction reaction) of Pd(0) bionanoparticles of varying particle size formed under30 different conditions were compared. The finest Pd(0) bionanoparticles obtained at 50 mM Cl-31 (mean 8.7 nm; median 5.6 nm) exhibited the greatest specific Cr(VI) reduction rate, with 4-times32 higher catalytic activity compared to commercial Pd/C. The potential applicability of S. tokodaii33 cells in the recovery of highly catalytic Pd(0) nanoparticles from actual acidic chloride leachate34 was thus suggested.続きを見る
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Mendeley出力
