Surfactant mediated synthesis of silica nanoparticles using sugarcane ash waste as renewable source
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2017
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PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st
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Green silica from renewable source can be used in very different materials, since addictive for
construction materials or polymers to traditional products as glass, silicone rubber as well as
source for silicon. Brazil is the world’s largest producer of sugarcane and generates huge
amounts of sugarcane ash waste (SAW) which is a rich source of silica. This work investigates
a method to produce pure silica nanoparticles from SAW. Initially, sodium silicate was obtained
from sugarcane ash waste adapting the methodology published by Alves, et al., 2017.
Subsequently, sodium silicate was added to a mixture of water/butyl alcohol (1:1) with 2.5% wt.
of hexadecyltrimethylammonium bromide under constant stirring at 60 °C. Then, 0.5 mol L-1
sulfuric acid solution was added slowly to suspension until pH 4 and the resulting gel was aged
at 60 °C for 8 h. The aged nanosilica gel was washed with distilled water, filtered and oven dried
at 120 °C. The silica nanoparticles were characterized by different techniques. In the Figure 1
can be observed energy dispersive spectra (EDS) and transmission electron microscopy (TEM)
images of sugarcane ash waste (A and B) and of silica nanoparticles (C and D). EDS of SAW
shows the presence of several different elements (being Si, Fe, Al, P, Cl and S more abundant)
and only Si and O were observed after synthesis procedure (Cu signal comes from TEM grid).
Transmission electron microscopy image of samples exhibit a drastic alterations of the material
size ranging from several micrometers (Fig. 1C) to less than 20 nm (Fig. 1D). The results
indicate that was possible to obtain pure silica in a nano- size from waste material to reduce
disposal and pollution problems.
Como referenciar
ROVANI, SUZIMARA; SANTOS, JONNATAN J.; CORIO, PAOLA; FUNGARO, DENISE A. Surfactant mediated synthesis of silica nanoparticles using sugarcane ash waste as renewable source. In: PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st, November 27-30, 2017, Guarujá, SP. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/29218. Acesso em: 20 Apr 2024.
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.