Advances in Materials Research

Volume 13, Number 3, 2024, pages 173-181

DOI: 10.12989/amr.2024.13.3.173

Carbon nanotubes formation on clay and fly ash from catalytic thermal decomposition of recycled polypropylene

Nur A. Atikah Kamaruddin , Norzilah A. Halif , Siti A. Hussin , Mohd. N. Mazlee

Abstract

Fly ash, plastic waste, and clay are mineral materials and residues commonly found in Malaysia. In this study, these materials were fully utilized as raw materials for synthesizing carbon nanotubes (CNTs). Recycled polypropylene, previously used as a food container, served as a carbon source. Fly ash and clay were explored as potential substrates for CNTs growth. The recycled polypropylene was thermally decomposed at 900 oC in an inert environment for 90 minutes. Carbon atoms released during this process were deposited on fly ash and clay substrates, which had been immersed in a ferrocene solution to provide a metal catalyst for CNTs growth. The deposited products were characterized using a Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD). Morphological analysis revealed that both fly ash and clay were coated with fiber-like structures, confirmed to be CNTs based on a diffraction peak around 26o from the XRD pattern. In conclusion, clay and fly ash demonstrate the potential to be utilized as substrates for CNTs formation.

Key Words

catalytic thermal decomposition; clay; CNTs; fly ash; recycled polypropylene

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