Details

Autor(en) / Beteiligte

• Rodríguez-Carballo, Gabriela
• Moreno-Tost, Ramón
• Fernandes, Sónia
• Esteves da Silva, Joaquim C.G.
• Pinto da Silva, Luís
• Galiano, Eulogio Castro
• Algarra, Manuel

Titel

Nitrogen doped carbon dots as a photocatalyst based on biomass. A life cycle assessment

Ist Teil von

• Journal of cleaner production, 2023-10, Vol.423, p.138728, Article 138728

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The effectiveness of various transition metal phosphate-based acid catalysts, including vanadium and niobium, in the hydrothermal synthesis of carbon dots (CDs), has been assessed. Two sources of carbohydrates were employed for this: commercial xylose and liquor of xylose produced by processing olive pits. Catalysts were identified using the NH3-TPD, DTA/TG, XRD, and XPS techniques. The reaction was conducted for 4 h at a temperature of 180 °C. The existence of such nanoparticles, regardless of the carbohydrate source, was confirmed by an analysis of the features and characteristics of CDs nanoparticles. N-doped CDs with increased fluorescence were also created at the same time using a similar hydrothermal technique, and their photocatalytic activity was investigated. A Life Cycle Assessment (LCA) was conducted for both syntheses with the goal of comparing the environmental effects of the synthesis from commercial xylose to the synthesis from biomass. It was revealed that, although energy is the primary driver of both synthesis pathways' effect categories, the fundamental variations that seem to determine their relative sustainability are connected to the nature of the carbon precursor. Regarding the latter, it is determined that electricity has the greatest environmental impact. [Display omitted] •Valorisation of enriched xylose biomass was used to obtain carbon-based nanoparticles, namely Carbon dots (CDs).•CDs were hydrothermal synthesized by a heterogenous catalyst on-step process at 180 °C.•CDs were doped by N heteroatoms to enhance their activity in terms of electron surface charge activity.•Their activity, based in photocatalytic behaviour, was tested versus the degradation of methyl orange.•With the aim of evaluating the environmental impact a LCA was performed for compared commercial and biomass xylose.