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Advisor(s)
Abstract(s)
Plastics are among the most generated solid wastes, predominantly composed by polymers,
as low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene
(PP).1 This work deals with the preparation of magnetic carbon nanotubes (CNTs) by
catalytic chemical vapor deposition (CCVD) at 850 ºC, considering LDPE, HDPE and PP
as carbon precursors representative of urban plastic solid waste in a perspective of circular
economy.1 Magnetite supported in alumina nanoparticles previously synthesized by sol-gel
were used as catalysts in the CCVD process. Afterward, each synthesized CNT was washed
with 50% H2SO4 at 140 °C during 3 h to remove the remaining magnetite, following methods
previously described.2 The successful removal of the magnetite particles was assessed
measuring the ashes content of the CNTs, removals higher than 83% being achieved (ashes
content of final CNT products ranging from 4.2 to 7.9%). The remaining catalyst was located
inside the CNTs, conferring magnetic properties to the materials even after washing (Figure
1). BET specific surface areas of 94, 75, and 66 m2 g-1 were found for CNT_LDPE,
CNT_HDPE and CNT_PP, respectively, and a slight increase of 1-5 m2 g-1 was observed
after washing the materials with acid.
Description
Keywords
Magnetic carbon nanotubes Research Subject Categories::TECHNOLOGY::Bioengineering
Pedagogical Context
Citation
Sanches, Lucas Fenato; Silva, Adriano S.; Roman, Fernanda; Silva, Ana Paula; Díaz de Tuesta, Jose Luis; Silva, Fernando Alves; Silva, Adrián; Faria, Joaquim; Gomes, Helder (2022). Magnetic carbon nanotubes prepared from LDPE, HDPE and PP. In Diana C.G.A. Pinto; Martyn Pillinger; Anabela Valente; Mário Simões (Eds.) XI National Meeting on Catalysis and Porous Materials: Abstracts book. Aveiro
Publisher
Sociedade Portuguesa de Química