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From Rice Husk Ash to Silica-Supported Carbon Nanomaterials: Characterization and Analytical Application for Pre-Concentration of Steroid Hormones from Environmental Waters

Articolo
Data di Pubblicazione:
2023
Abstract:
Rice husk (RH) in the rice industry is often air-burnt to obtain energy in the form of heat and RH ash (RHA) residue. In this work, RHA was applied as a starting material to obtain silica-supported carbon nanomaterials, resulting in a new reuse of a globally produced industrial waste product, in a circular economy approach. The preparation involves ultrasound-assisted one-pot oxidation with a sulfonitric mixture followed by wet oven treatment in a closed vessel. A study of oxidation times and RHA amount/acid volume ratio led to a solid material (nC-RHA@SiO2) and a solution containing silica-supported carbon quantum dots (CQD-RHA@SiO2). TEM analyses evidenced that nC-RHA@SiO2 consists of nanoparticle aggregates, while CQD-RHA@SiO2 are carbon-coated spherical silica nanoparticles. The presence of oxygenated carbon functional groups, highlighted by XPS analyses, makes these materials suitable for a wide range of analytical applications. As the main product, nC-RHA@SiO2 was tested for its affinity towards steroid hormones. Solid-phase extractions were carried out on environmental waters for the determination of target analytes at different concentrations (10, 50, and 200 ng L−1), achieving quantitative adsorption and recoveries (RSD < 20%, n = 3). The method was successfully employed for monitoring lake, river, and wastewater treatment plant water samples collected in Northern Italy.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
biomass; carbon nanomaterials; circular economy; emerging contaminants; extraction; rice husk ash
Elenco autori:
Bianchini, P.; Merlo, F.; Maraschi, F.; Brescia, R.; Prato, M.; Profumo, A.; Speltini, A.
Autori di Ateneo:
MARASCHI FEDERICA
MERLO FRANCESCA
PROFUMO ANTONELLA
SPELTINI ANDREA
Link alla scheda completa:
https://iris.unipv.it/handle/11571/1475114
Pubblicato in:
MOLECULES
Journal
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