wcm.02.2022.146.153

“Green” synthesis is attracted considerable interest in materials science as a reliable, durable, and environmentally friendly approach to fabricating a wide range of nanoparticles such as metal oxide. Green production of metal nanoparticles was used to host a variety of biological components (such as fungi, algae, plant extracts bacteria etc.). Shewanella oneidensis MR-1 was employed in this biosynthetic investigation of palladium nanoparticles (Bio-Pd) to produce Cr (VI) under aerobic circumstances. By adjusting the ratio of microbial biomass to palladium precursors, it was possible to control the distribution and size of Bio-Pd. The Pd ratio had the smallest average particle size at 6.33 1.69 nm. Additionally, it has a formic acid oxidation electrocatalytic potential of -0.132 V, which is 0.158 V smaller than that of commercial Pd/C (5%). The entire catalytic reduction of a 200 mg/L Cr (VI) solution could be achieved by the tiny, uniformly distributed extracellular Bio-Pd within 10 minutes, but commercially available Pd/C (5%) required at least 45 minutes. Over five cycles, the Bio-Pd material offers a high decrease rate. Microbes have a substantial effect on the entire process of effectively reducing Cr (VI), dispersing palladium nanoparticles, and adsorbing Cr (III). The findings of this study will serve as a guide for the advancement of effective and environmentally acceptable bio-Pd catalysts for pollution control in straightforward and reasonable situations.