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The hydrothermal processing of iron oxides from bacterial biofilm waste as new nanomaterials for broad applications.

ABSTRACT: Iron oxides and their hydroxides have been studied and analysed with properties of their mutual transformations under different hydrothermal conditions being indicated. Amorphous bacteria nanowires produced from biofilm waste were investigated under the influence of pH at a fixed duration (20 h) and reaction temperature (200 °C). The morphology, structure, and particle size of the transformation of hematite (α-Fe₂O₃) was obtained and characterised with SEM, XRD, FTIR, and particle sizer. The optimal conditions for the complete conversion of amorphous iron oxide nanowires to crystalline α-Fe₂O₃ is under acidic conditions where the pH is 1. The flower-like α-Fe₂O₃ structures have photocatalytic activity and adsorbent properties for heavy metal ions. This one-pot synthesis approach to produce α-Fe₂O₃ at a low cost would be greatly applicable to the recycling process of biofilm waste in order to benefit the environment.

SUBMITTER: Yu L

PROVIDER: S-EPMC9087643 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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The hydrothermal processing of iron oxides from bacterial biofilm waste as new nanomaterials for broad applications.

Yu Le L Tran Diana N H DNH Forward Peter P Lambert Martin F MF Losic Dusan D

RSC advances 20181011 61

Iron oxides and their hydroxides have been studied and analysed with properties of their mutual transformations under different hydrothermal conditions being indicated. Amorphous bacteria nanowires produced from biofilm waste were investigated under the influence of pH at a fixed duration (20 h) and reaction temperature (200 °C). The morphology, structure, and particle size of the transformation of hematite (α-Fe<sub>2</sub>O<sub>3</sub>) was obtained and characterised with SEM, XRD, FTIR, and p ...[more]

PMID: 35547056

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Project description:Food waste is a promising resource for the production of fuels and chemicals. However, increasing plastic contamination has a large impact on the efficiency of conversion for the more established biological routes such as anaerobic digestion or fermentation. Here, we assessed a novel route through the hydrothermal liquefaction (HTL) of a model waste (pistachio hulls) and polypropylene (PP). Pure pistachio hulls gave a biocrude yield of 34% (w/w), though this reduced to 16% (w/w) on the addition of 50% PP in the mixture. The crude composition was a complex blend of phenolics, alkanes, carboxylic acids, and other oxygenates, which did not change substantially on the addition of PP. Pure PP does not breakdown at all under HTL conditions (350 °C, 15% solids loading), and even with biomass, there is only a small synergistic effect resulting in a conversion of 19% PP. This conversion was enhanced through using typical HTL catalysts including Fe, FeSO4·7H2O, MgSO4·H2O, ZnSO4·7H2O, ZSM-5, aluminosilicate, Y-zeolite, and Na2CO3; the conversion of PP reached a maximum of 38% with the aluminosilicate, for example. However, the PP almost exclusively broke down into a solid-phase product, with no enhancement of the biocrude fraction. The mechanism was explored, and with the addition of the radical scavenger butylated hydroxytoluene (BHT), the conversion of plastic reduced substantially, demonstrating that radical formation is necessary. As a result, the plastic conversion was enhanced to over 50% through the addition of the co-solvent and hydrogen donor, formic acid, and the radical donor, hydrogen peroxide. The addition of formic acid also changed the crude composition, including more carboxylic acids and oxygenated species than the conversion of the biomass alone; however, the majority of the carbon distributed to the volatile organic gas fraction producing an array of short-chain volatile hydrocarbons, which potentially could be repolymerized as a polyolefin or combined with the biocrude for further processing. Catalytic HTL was therefore shown to be a promising method for the valorization of polyolefins with biomass under typical HTL conditions.

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The hydrothermal processing of iron oxides from bacterial biofilm waste as new nanomaterials for broad applications.

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The hydrothermal processing of iron oxides from bacterial biofilm waste as new nanomaterials for broad applications.

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