Red mud is a waste product of aluminum industry, produced during Bayer process. It mainly contains iron, potassium, aluminum and zinc. Currently, it is being used for the synthesis of carbon nanotubes. However, red mud, obtained from different ores, has diverse effects on the size of carbon nanotubes. Therefore, this work represents the composition of red mud produced in Pakistan. The effect of different iron concentration in red mud, on the synthesis of CNTs, was studied. Proton Induced X-rays emission was carried out to investigate the elements present in raw red mud. X-rays Diffraction crystallography of raw red mud showed that red mud had a mixture of quartz, hematite, goethite and hydro-garnet etc. Fourier Transform Infrared Spectroscopic studies gave stretching and bending vibration of OH bound to Fe, Al, and Si-O vibration. Carbon nanotubes were synthesized, using different reaction conditions i.e. temperature, un-doped and doped red mud. Methane was used as a source for carbon nanotubes. The reaction was carried out in a tube furnace over undoped and iron doped red mud separately. Scanning electron microscopy showed that CNTs with reduced sizes were observed on iron doped red mud.

Muhammad Bilal, Tariq Mahmood, Javed Ali and Fozia Sultana