Silica synthesis from biomass
Carregando...
Data
Data de publicação
2025
Autores IPEN
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
SOUTHERN SCIENCE CONFERENCE, 2nd
Exportar
Resumo
Agribusiness activities are generating large amounts of waste due to production
processes and society’s high consumption standard. The most common types of
crop biomass waste are straw, bark, cob and bagasse. The amount of agricultural
waste generated in the world (million tons/year) is: Rice husk: 130-170; Corn Cob: 164;
Sugarcane Bagasse: 700. Most of this waste is disposed of by burning, dumping,
or landfilling. Incorrect disposal raises serious questions related to human health
and the environment, mainly associated with air pollution, water and soil contamination. The strategy to mitigate the effects of disposal is the reuse of agricultural
biomass waste. Wastes such as rice husk, corn cob, wheat straw and sugarcane bagasse present high content of silica in the composition, thus can be utilized for the
production of nanosilica (SiNPs). SiNPs present a variety of applications due to their
distinctive properties such as stability, biocompatibility, surface reactivity, tunable pore size, and high surface area. Extracting silica from agricultural waste is an
excellent alternative to obtain high added-value products. Methods of extracting
silica from agricultural waste are divided into thermal, biological and chemical. The
chemical synthesis method has the advantage of size and shape control, as well as
purity improvement. Among the chemical methods, SiNPs are mainly synthesized
via a sol-gel polymeric route. The silica is extracted from the waste as sodium silicate, then treated with acid to convert it into a gel. A transformation occurs in colloidal suspension of sol into gel through 3D interconnecting network. The sol–gel
technique allows control the size, distribution, and morphology of particles with a
large specific area and high porosity. Pure amorphous silica was successfully extracted at a 99.1% from sugarcane waste ash. The synthesized SiNPs can be characterized by a combination of spectroscopic and chemical techniques, such as XRD,
XRF, SEM, TEM, particle size distribution, N2 adsorption-desorption isotherms, TGA,
and FTIR. In this approach, the adoption of the circular economy in agroindustrial
waste management contributes significantly to the achievement of the Sustainable Development Goals (SDGs), specifically, SDG 12: “By 2030, substantially reduce
waste generation through prevention, reduction, recycling and reuse”.
Como referenciar
FUNGARO, DENISE A. Silica synthesis from biomass: sustainable use of agroindustrial waste. In: SOUTHERN SCIENCE CONFERENCE, 2nd, November 7-9, 2024, Mendoza, Argentina. Abstract... Nova Prata, RS: Editora da Universidade de Vassouras, 2025. p. 29-30. Disponível em: https://repositorio.ipen.br/handle/123456789/49160. Acesso em: 20 Jan 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.