Steam activation,characterisation and adsorption studies of activated carbon from maize tassels |
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| Authors: | OF Olorundare RWM Krause JO Okonkwo BB Mamba |
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| Institution: | 1. Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa;2. Department of Chemistry, Rhodes University, Grahamstown, South Africa;3. Department of Environmental, Water &4. Earth Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa |
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| Abstract: | In this paper, steam-produced activated carbon (STAC) from maize tassel (MT) was evaluated for its ability to remove basic dye (methylene blue MB) from aqueous solution in a batch adsorption process. The equilibrium experiments were conducted in the range of 50–300 mg/L initial MB concentrations at 30°C, for effect of pH, adsorbent dosage and contact time. The experimental data were analysed by Langmuir, Freundlich and Temkin isotherm models of adsorption. Freundlich adsorption isotherm was found to have highest value of R2(R2=0.97) compared to other models of Langmuir and Temkin having (0.96 and 0.95 respectively). STAC has a high adsorptive capacity for MB dye (200 mg/g) and also showed favourable adsorption for the dye with the separation factor (RL<1) for the dye-activated carbon system. The kinetic data obtained were analysed using pseudo first-order kinetic equation and pseudo second-order kinetic equation. The experimental data fitted well into pseudo second-order kinetic equation, as demonstrated by the high value of R2. |
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| Keywords: | activated carbon activated maize tassel adsorption isotherm methylene blue steam activation |
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