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

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-coate

SUBMITTER: Bianchini P 

PROVIDER: S-EPMC9866712 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature