Preparation and characterisation of activated carbon from Vitisvinifera leaf litter and its adsorption performance for aqueous phenanthrene

Adetunji Awe1, Beatrice O Opeolu2, Olalekan S Fatoki3, Olushola Sunday Ayanda4, Vanessa Angela Jackson5, Reinette G. Snyman6
1Department of Chemistry, Cape Peninsula University of Technology, Cape Town, South Africa
2Department of Environmental and Occupational Studies, Faculty of Applied Sciences, Cape Peninsula University of Technology, Cape Town, South Africa
3Faculty of Applied Sciences, Cape Peninsula University of Technology, Cape Town, South Africa
4Department of Industrial Chemistry, Federal University Oye Ekiti, Oye Ekiti, Nigeria
5Department of Biotechnology and Consumer Science, Cape Peninsula University of Technology, Cape Town, South Africa
6Department of Conservation and Marine Sciences, Cape Peninsula University of Technology, Cape Town, South Africa

Tóm tắt

Abstract

The adsorption of phenanthrene onto activated carbons produced from Vitisvinifera leaf litter (a waste plant biomass) was investigated in this study. Zinc chloride (ZnCl2) and phosphoric acid (H3PO4) were utilised as activating agents in producing the activated carbons. The characterisation of the activated carbons was achieved with Fourier transform infrared spectroscopy (for surface functional groups), scanning electron microscopy (for surface morphology) and Brunauer–Emmett–Teller (BET) (for surface area determination). The adsorption of phenanthrene onto the activated carbons was optimised in terms of solution pH, adsorbent dosage, initial concentration of adsorbate solution and contact time. Experimental results showed that H3PO4 modified activated carbon gave better yield (up to 58.40%) relative to ZnCl2 modified activated carbon (only up to 47.08%). Meanwhile, surface characterisation showed that ZnCl2 modification resulted in higher BET surface area (up to 616.60 m2/g) and total pore volume (up to 0.289 cm3/g) relative to BET surface area of up to 295.49 m2/g and total pore volume of up to 0.185 cm3/g obtained from H3PO4 modified activated carbons. Adsorption equilibrium data fitted well into Freundlich isotherm model relative to other applied isotherm models, with maximum Kf value of 1.27 for ZnCl2 modified activated carbon and 1.16 Kf value for H3PO4 modified activated carbon. The maximum adsorption capacity for ZnCl2 and H3PO4 activated carbons for the removal of phenanthrene were 94.12 and 89.13 mg/g, respectively. Kinetic studies revealed that dynamic equilibrium was reached at 80 min contact time. Experimental data fitted best into the Elovich kinetic model relative to other kinetic models, based on the correlation coefficient (R2) values obtained from kinetic studies. Chemisorption was deduced as a major phenanthrene removal pathway from aqueous solution and the physicochemical characteristics of the adsorbents have major influence on phenanthrene removal efficiencies.

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