Manganese and cobalt redox cycling in laterites; Biogeochemical and bioprocessing implications

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dc.creatorNewsome, Laura
dc.creatorSolano Arguedas, Agustín
dc.creatorCoker, Victoria S.
dc.creatorBoothman, Cristopher
dc.creatorLloyd, Jonathan R.
dc.date.accessioned2021-10-30T01:49:12Z
dc.date.available2021-10-30T01:49:12Z
dc.date.issued2020
dc.descriptionThis research was developed during the PhD studies of Agustín Solano Arguedas in the University of Manchester, United Kingdom. PhD scholarship was funded by the Ministerio de Ciencia, Tecnología y Telecomunicaciones (MICITT) of the Government of Costa Rica and the Universidad de Costa Rica (UCR). Agustín Solano Arguedas is a researcher at the Unidad de Recursos Forestales (Reforesta, Unit of Forest Resources) of the Instituto de Investigaciones en Ingeniería (INII, Engineering Research Institute), UCR.es_ES
dc.description.abstractCobalt is essential for the modern technology that underpins the decarbonisation of our economies, but its supply is limited leading to its designation as a critical metal. Cobalt biogeochemistry is poorly understood, yet knowledge of how biogeochemical cycling impacts cobalt behaviour could assist the development of new techniques to recover cobalt from ores, and so improve the security of supply. Laterites are an important source of cobalt, they are primarily processed for nickel using energy or chemical intensive processes, with cobalt recovered as a by-product. Metal-reducing conditions were stimulated in laterite sediment microcosms by the addition of simple and cheaply available organic substrates (acetate or glucose). At the end of the experiment the amount of easily recoverable cobalt (aqueous or extractable with acetic acid) increased from < 1% to up to 64%, which closely mirrored the behaviour of manganese, while only a small proportion of iron was transformed into an easily recoverable phase. Sequencing of the microbial community showed that the addition of organic substrates stimulated the growth of indigenous prokaryotes closely related to known manganese(IV)/iron(III)-reducers, particularly from the Clostridiales, and that fungi assigned to Penicillium, known to produce organic acids beneficial for leaching cobalt and nickel from laterites, were identified. Overall, the results indicate that the environmental behaviour of cobalt in laterites is likely to be controlled by manganese biogeochemical cycling by microorganisms. These results are compelling given that similar behaviour was observed in four laterites (Acoje, Çaldağ, Piauí and Shevchenko) from different continents. A new bioprocessing strategy is proposed whereby laterites are treated with an organic substrate to generate metal-reducing conditions, then rinsed with acetic acid to remove the cobalt. Not only are organic substrates environmentally-friendly and potentially sourced from waste carbon substrates, a minimal amount of iron oxides was mobilised and consequently less waste generated.es_ES
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ingeniería::Instituto Investigaciones en Ingeniería (INII)es_ES
dc.description.sponsorshipNatural Environment Research Council/[CoG3 NE/M011518/1]/NERC/Reino Unidoes_ES
dc.description.sponsorshipDiamond Light Source/[SP16735]//Reino Unidoes_ES
dc.description.sponsorshipDiamond Light Source/[SP17313]//Reino Unidoes_ES
dc.description.sponsorshipOffice of Science User Facility/[DE-AC02-05CH11231]//Estados Unidoses_ES
dc.identifier.citationhttps://www.sciencedirect.com/science/article/pii/S0009254119304371?via%3Dihub
dc.identifier.doi10.1016/j.chemgeo.2019.119330
dc.identifier.issn0009-2541
dc.identifier.urihttps://hdl.handle.net/10669/84886
dc.language.isoenges_ES
dc.rightsacceso abierto
dc.sourceChemical Geology, vol.531, pp.119330es_ES
dc.subjectBiochemistryes_ES
dc.subjectBioreductiones_ES
dc.subjectCobaltes_ES
dc.subjectNickeles_ES
dc.subjectIron-reductiones_ES
dc.subjectManganese-reductiones_ES
dc.titleManganese and cobalt redox cycling in laterites; Biogeochemical and bioprocessing implicationses_ES
dc.typeartículo original

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