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

The adsorption of phenanthrene onto activated carbons produced from Vitis vinifera leaf litter (a waste plant biomass) was investigated in this study. Zinc chloride (ZnCl 2 ) and phosphoric acid (H 3 PO 4 ) were utilised as activating agents in producing the activated carbons. The characterisation o...

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Veröffentlicht in:Applied biological chemistry 2020-02, Vol.63 (1), Article 12
Hauptverfasser: Awe, Adetunji Ajibola, Opeolu, Beatrice Olutoyin, Fatoki, Olalekan Siyanbola, Ayanda, Olushola Sunday, Jackson, Vanessa Angela, Snyman, Reinette
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Snyman, Reinette
description The adsorption of phenanthrene onto activated carbons produced from Vitis vinifera leaf litter (a waste plant biomass) was investigated in this study. Zinc chloride (ZnCl 2 ) and phosphoric acid (H 3 PO 4 ) 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 H 3 PO 4 modified activated carbon gave better yield (up to 58.40%) relative to ZnCl 2 modified activated carbon (only up to 47.08%). Meanwhile, surface characterisation showed that ZnCl 2 modification resulted in higher BET surface area (up to 616.60 m 2 /g) and total pore volume (up to 0.289 cm 3 /g) relative to BET surface area of up to 295.49 m 2 /g and total pore volume of up to 0.185 cm 3 /g obtained from H 3 PO 4 modified activated carbons. Adsorption equilibrium data fitted well into Freundlich isotherm model relative to other applied isotherm models, with maximum K f value of 1.27 for ZnCl 2 modified activated carbon and 1.16 K f value for H 3 PO 4 modified activated carbon. The maximum adsorption capacity for ZnCl 2 and H 3 PO 4 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 ( R 2 ) 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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Zinc chloride (ZnCl 2 ) and phosphoric acid (H 3 PO 4 ) 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 H 3 PO 4 modified activated carbon gave better yield (up to 58.40%) relative to ZnCl 2 modified activated carbon (only up to 47.08%). Meanwhile, surface characterisation showed that ZnCl 2 modification resulted in higher BET surface area (up to 616.60 m 2 /g) and total pore volume (up to 0.289 cm 3 /g) relative to BET surface area of up to 295.49 m 2 /g and total pore volume of up to 0.185 cm 3 /g obtained from H 3 PO 4 modified activated carbons. Adsorption equilibrium data fitted well into Freundlich isotherm model relative to other applied isotherm models, with maximum K f value of 1.27 for ZnCl 2 modified activated carbon and 1.16 K f value for H 3 PO 4 modified activated carbon. The maximum adsorption capacity for ZnCl 2 and H 3 PO 4 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 ( R 2 ) values obtained from kinetic studies. 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Meanwhile, surface characterisation showed that ZnCl 2 modification resulted in higher BET surface area (up to 616.60 m 2 /g) and total pore volume (up to 0.289 cm 3 /g) relative to BET surface area of up to 295.49 m 2 /g and total pore volume of up to 0.185 cm 3 /g obtained from H 3 PO 4 modified activated carbons. Adsorption equilibrium data fitted well into Freundlich isotherm model relative to other applied isotherm models, with maximum K f value of 1.27 for ZnCl 2 modified activated carbon and 1.16 K f value for H 3 PO 4 modified activated carbon. The maximum adsorption capacity for ZnCl 2 and H 3 PO 4 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 ( R 2 ) values obtained from kinetic studies. 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Zinc chloride (ZnCl 2 ) and phosphoric acid (H 3 PO 4 ) 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 H 3 PO 4 modified activated carbon gave better yield (up to 58.40%) relative to ZnCl 2 modified activated carbon (only up to 47.08%). Meanwhile, surface characterisation showed that ZnCl 2 modification resulted in higher BET surface area (up to 616.60 m 2 /g) and total pore volume (up to 0.289 cm 3 /g) relative to BET surface area of up to 295.49 m 2 /g and total pore volume of up to 0.185 cm 3 /g obtained from H 3 PO 4 modified activated carbons. Adsorption equilibrium data fitted well into Freundlich isotherm model relative to other applied isotherm models, with maximum K f value of 1.27 for ZnCl 2 modified activated carbon and 1.16 K f value for H 3 PO 4 modified activated carbon. The maximum adsorption capacity for ZnCl 2 and H 3 PO 4 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 ( R 2 ) 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.</abstract><cop>Singapore</cop><pub>Springer Singapore</pub><doi>10.1186/s13765-020-00494-1</doi><tpages>17</tpages><orcidid>https://orcid.org/0000-0001-9811-9824</orcidid><orcidid>https://orcid.org/0000-0001-8022-8010</orcidid><orcidid>https://orcid.org/0000-0001-6933-0866</orcidid><orcidid>https://orcid.org/0000-0001-7379-7979</orcidid><oa>free_for_read</oa></addata></record>
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subjects Activated carbon
Adsorbates
Adsorbents
Adsorption
Applied Microbiology
Aqueous solutions
Biological Techniques
Bioorganic Chemistry
Carbon
Chemisorption
Chemistry
Chemistry and Materials Science
Correlation coefficient
Correlation coefficients
Food Science & Technology
Fourier transforms
Functional groups
Infrared spectroscopy
Isotherms
Leaf litter
Leaves
Life Sciences & Biomedicine
Morphology
Organic chemistry
Phenanthrene
Phosphoric acid
Plant biomass
Scanning electron microscopy
Science & Technology
Surface area
Surface chemistry
Surface properties
Zinc chloride
title Preparation and characterisation of activated carbon from Vitisvinifera leaf litter and its adsorption performance for aqueous phenanthrene
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