Tesis Pregrado
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Browsing Tesis Pregrado by Author "Benito Gómez, Noelia"
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Item Caracterización Fisicoquímica de Nanopartículas de Sulfuro de Cobre Biosintetizadas a Partir de Drenajes Ácidos Mineros.(Universidad de Concepción., 2023) Contreras Solar, Ayleen; Benito Gómez, NoeliaMineral wastewater, such as Acid Mine Drainage (AMD), is one of the main causes of sulfate presence in groundwater and surface water, hence the need for novel biotechnology for wastewater remediation. Given this, biosulfidogenesis is presented as a sustainable alternative, where sulfate-reducing bacteria (SRB) produce hydrogen sulfide (H2S), which, in contact with AMD, acts as a precipitating agent for metals contained in it composition, allowing the biosynthesis of a variety of nanomaterials. In this thesis, copper sulfide nanoparticles were successfully biosynthesized from real acid mine drainage from a copper mine in Chile, by injecting H2S, generated in sulfidogenic bioreactors. Subsequently, several characterizations were carried out in order to study some of their physicochemical properties. The resulting copper sulfide nanoparticles possess spherical morphology with a mean diameter of 40 ± 9 nm, a hexagonal structure with high crystallinity, and lattice parameters a = b = 3,79 Å y c = 16,445 Å. In addition, they are composed of Cu and S, which accounts for the purity of the covellite. Likewise, they exhibit a wide absorption spectrum in the UV-Vis-NIR region, in which at 630 nm it reaches a minimum absorption, as a result of the absorption of electron-hole pairs; while, at 975 nm, it exhibits an absorption peak produced by localized surface plasmon resonance.