Category: Research Published: Thursday, 10 March 2016

Waste rubber tyres were used to prepare activated carbon via destructive distillation method employing a two stage process i.e. carbonization and chemical activation in a tubular furnace. Carbonization was done at 500°C for 1 h followed by impregnation of char with NaOH. Activation was done in a horizontal tube furnace via CO2 activation. Two variables and three parameters i.e. impregnation ratio between NaOH and char (1:1 and 3:1), activation temperature (700°C and 900°C), and activation time (60 min and 180 min) were studied and its effects on percentage yield, and malachite green (MG) dye removal were compared and presented in this paper. IR spectra of all the samples at 1710, 1620, and from 1054 cm–1 –1026 cm–1 indicated the presence of carboxylic, carbonyl, and some acids, alcohols, ether and ester groups on the surface of the prepared carbon. Activated carbon, AC6, which was prepared at a ratio of 3:1 and heated at 900°C for 60 min was selected due to its high surface area (313.17 m2/g). It had a MG removal rate of 97.43% after 60 minutes. AC6 was best fitted to the Freundlich isotherm indicating multilayer adsorption while the adsorption kinetics followed the pseudo-second-order kinetics. Keywords: Activated carbon; adsorption; malachite green; waste tyre; impregnation ratio.

This research was led by Dr. Collin G. Joseph, a senior lecturer with the Industrial Chemistry programme in the Faculty of Science & Natural Resources. The findings were presented orally at the 18th Malaysian International Chemical Congress in PWTC, Kuala Lumpur in 2014 and published in the scientific journal, Malaysian Journal of Chemistry, 2015, Vol. 17(2), 16–28 in 2015.



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