Pseudomonas putida GB-1 is a Mn(II)-oxidizing bacterium that produces pyoverdine-type siderophores (PVDs), which facilitate the uptake of Fe(III) but also influence MnO2 formation. Recently, a non-ribosomal peptide synthetase mutant that does not synthesize PVD was described. Here we identified a gene encoding the PVDGB-1 (PVD produced by strain GB-1) uptake receptor (PputGB1_4082) of strain GB...

The morphology-controlled synthesis of SnO2 hollow/nanoporous nanostructures (nanotubes, urchin-like morphologies and nanospheres) was achieved via a template-engaged replacement reaction at a mild temperature (lower than 80 °C). The formation mechanism of hollow interior and nanoporous walls for the obtained SnO2 nanostructures (SnO2 nanotubes were used as an example) was investigated based on...

Rechargeable aqueous aluminium batteries are the subject of growing interest, however, charge storage mechanisms at manganese oxide-based cathodes remain poorly understood. In essense, every study proposes a different mechanism. Here, an in situ spectroelectrochemical methodology is used to unambiguously demonstrate that reversible proton-coupled MnO2-to-Mn2+ conversion main mechanism occurring...

Supercapacitor electrodes, composed of vertically-oriented graphene (VG) and MnO2, are synthesized on native SiO2-passivated silicon wafers. The VG layers with a thickness ~3 μm deposited directly the substrates via plasma-enhanced chemical vapor deposition (PECVD). distribution levels MnO2 formed electrodepositing method investigated by using different types solutions. deeper infiltration depo...

The field of impact electrochemistry, namely, electrochemical processes occurring at nanoparticles during collisions with a substrate electrode, has recently been applied to the recovery commercially important metals. In this study, reduction and oxidation solution Mn(II) were observed on carbon black particles nanoimpacts, onset potentials in good agreement voltammetry. formation Mn(0) MnO2 wa...

In this work, zeolite NaY was prepared by hydrothermal method. Then, silver ions were replaced in the zeolite NaY with silver nitrate (AgNO3) solution via using ion exchange (IE) method. The Manganese dioxide (MnO2) nanoparticles (9.3 and 15.8 wt %) for guest were deposited in the zeolite AgY(host) structure with Mn(NO3)2 aqueous and KMnO4 solutions by confined space synthesis (CSS) metho...

Anaerobically grown cells of the metal-reducing bacterium Shewanella putrefaciens MR-1 contain multiple outer membrane (OM) cytochromes. A gene replacement mutant (strain OMCB1) lacking the OM cytochrome OmcB is markedly deficient in the reduction of MnO2 and exhibits reduced rates of Fe(III) reduction. The levels of other OM cytochromes are also decreased in OMCB1. Complementation of OMCB1 wit...

In the present work, we have reported the in situ oxidation of manganese (II) acetate to MnO2 nanoparticles through the thermal plasma carbonized natural hydroxyapatite (MnO2/TP-NHAp) as a neoteric sustainable method. Interestingly, the thermal plasma-processed surface of the NHAp shows a great ability for oxidation of the manganese (II) without need of any external oxidizing agents. The cataly...