2134/12327956.v1 Sophie Tarver Sophie Tarver Daniel Gray Daniel Gray Konstantin Loponov Konstantin Loponov Diganta Das Diganta Das Tao Sun Tao Sun Maria Sotenko Maria Sotenko Biomineralization of Pd nanoparticles using Phanerochaete chrysosporium as a sustainable approach to turn platinum group metals (PGMs) wastes into catalysts Loughborough University 2020 Science & Technology Life Sciences & Biomedicine Biotechnology & Applied Microbiology Environmental Sciences Environmental Sciences & Ecology WHITE-ROT FUNGUS EXTRACELLULAR BIOSYNTHESIS HETEROGENEOUS CATALYST SILVER NANOPARTICLES BACTERIAL BIOMASS HEAVY-METALS RECOVERY BIOACCUMULATION HYDROGENATION Biotechnology Biological Sciences 2020-05-20 10:49:49 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Biomineralization_of_Pd_nanoparticles_using_Phanerochaete_chrysosporium_as_a_sustainable_approach_to_turn_platinum_group_metals_PGMs_wastes_into_catalysts/12327956 Due to the increasing demand for recovery of precious metals from waste streams, the role of fungus as a potential adsorbent is growing. Thus, this research aimed to develop a novel method for the biomineralization of palladium nanoparticles using Phanerochaete chrysosporium fungus. The adsorption of palladium onto the fungal mycelium was studied by adding palladium salt at 12ā€“48 ppm to the fermentation medium following the fungal growth. Amide groups of chitin and proteins on the surface of the fungus are believed to coordinate palladium cations yielding Freundlich-type competitive adsorption isotherm. The adsorption capacity was found to reach 22-128 mgPd gāˆ’1 of dried fungal biomass. Biomineralization of palladium from an aqueous solution led to the formation of extracellular well defined Pd nanoparticles of 10ā€“14 nm confirmed by XPS, TEM and XRD analyses. The biologically synthesised nanoparticles were found to perform equally well to a Pd/C commercial catalyst in a Heck reaction of styrene and iodobenzene. This is the first reported use of Phanerochaete chrysosporium to synthesise palladium nanoparticles and confirmation of their resulting catalytic activity. The presented example paves the way for the development of fungi-based membranes to be used in the palladium recovery from industrial effluents.