Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull
The Vigna Subterranean (L.) Verdc hull’s (VSVH) potential to remove Cr(VI) ions from aqueous solutions was investigated. The biosorbent was characterised by FTIR, SEM-EDX and XRF before and after exposure to Cr(VI). The surface comprised of phenolic, carboxylate, sulphonate, carboxyl, ammines, silic...
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2016
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| author | Nharingo, Tichaona Moyo, Mambo Mahamadi, Courtie |
| author_facet | Nharingo, Tichaona Moyo, Mambo Mahamadi, Courtie |
| author_sort | Nharingo, Tichaona |
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| description | The Vigna Subterranean (L.) Verdc hull’s (VSVH) potential to remove Cr(VI) ions from aqueous solutions was investigated. The biosorbent was characterised by FTIR, SEM-EDX and XRF before and after exposure to Cr(VI). The surface comprised of phenolic, carboxylate, sulphonate, carboxyl, ammines, silica, silanol, phosphite esters, alkyl and hydroxyl functional groups responsible for Cr(VI) removal. Batch experiments were carried out in erlenmeyer flasks to optimize pH, contact time, biosorbent dosage and initial concentration of Cr(VI) ions. Reutilization of biosorbent was investigated using predetermined and optimized
0.14 M H2SO4. The initial and residual total chromium concentrations were estimated by FAAS. The optimum pH, contact time and biosorbent dosage were found to be 2, 180 minutes and 3 g/L respectively. The data generated from the effect of contact time and initial Cr(VI) concentration was subjected to kinetics and isotherm modelling respectively. The kinetic data fitted the pseudo first order model (R 2 = 0.9334) and the sorption mechanism was diffusion controlled with both film and intra particle diffusion involved in the rate
limiting step. The isotherm study confirmed favourable monolayer sorption best described by Langmuir model (R2 = 0.9986) with a very high monolayer sorption capacity of 232.5581 ± 0.9 mg/g. The Temkin model confirmed the endothermicity and weak ion-exchange nature of the Cr(VI)-biosorbent interactions that are important for biosorbent reuse. The biosorbent was recycled three times without significant loss of sorption-desorption capability. VSVH powder provides a renewable and reusable alternative for simple and effective Cr(VI) removal from wastewaters worth exploring for commercial-industrial application. |
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| language | English |
| publishDate | 2016 |
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| spelling | ir-11408-16682022-06-27T13:49:06Z Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull Nharingo, Tichaona Moyo, Mambo Mahamadi, Courtie Bio-reduction, Cr(VI), Intra-particle diffusion, Kinetics, Reutilization The Vigna Subterranean (L.) Verdc hull’s (VSVH) potential to remove Cr(VI) ions from aqueous solutions was investigated. The biosorbent was characterised by FTIR, SEM-EDX and XRF before and after exposure to Cr(VI). The surface comprised of phenolic, carboxylate, sulphonate, carboxyl, ammines, silica, silanol, phosphite esters, alkyl and hydroxyl functional groups responsible for Cr(VI) removal. Batch experiments were carried out in erlenmeyer flasks to optimize pH, contact time, biosorbent dosage and initial concentration of Cr(VI) ions. Reutilization of biosorbent was investigated using predetermined and optimized 0.14 M H2SO4. The initial and residual total chromium concentrations were estimated by FAAS. The optimum pH, contact time and biosorbent dosage were found to be 2, 180 minutes and 3 g/L respectively. The data generated from the effect of contact time and initial Cr(VI) concentration was subjected to kinetics and isotherm modelling respectively. The kinetic data fitted the pseudo first order model (R 2 = 0.9334) and the sorption mechanism was diffusion controlled with both film and intra particle diffusion involved in the rate limiting step. The isotherm study confirmed favourable monolayer sorption best described by Langmuir model (R2 = 0.9986) with a very high monolayer sorption capacity of 232.5581 ± 0.9 mg/g. The Temkin model confirmed the endothermicity and weak ion-exchange nature of the Cr(VI)-biosorbent interactions that are important for biosorbent reuse. The biosorbent was recycled three times without significant loss of sorption-desorption capability. VSVH powder provides a renewable and reusable alternative for simple and effective Cr(VI) removal from wastewaters worth exploring for commercial-industrial application. 2016-07-08T09:27:51Z 2016-07-08T09:27:51Z 2015 Article 1735-6865 https://www.researchgate.net/publication/297685967 http://hdl.handle.net/11408/1668 en International Journal of Environmental Research;Vol. 10, No. 1; p. 85-96 open |
| spellingShingle | Bio-reduction, Cr(VI), Intra-particle diffusion, Kinetics, Reutilization Nharingo, Tichaona Moyo, Mambo Mahamadi, Courtie Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull |
| title | Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull |
| title_full | Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull |
| title_fullStr | Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull |
| title_full_unstemmed | Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull |
| title_short | Kinetics and equilibrium studies on the biosorption of Cr(VI) by vigna subterranean (L.) verdc hull |
| title_sort | kinetics and equilibrium studies on the biosorption of cr(vi) by vigna subterranean (l.) verdc hull |
| topic | Bio-reduction, Cr(VI), Intra-particle diffusion, Kinetics, Reutilization |
| url | https://www.researchgate.net/publication/297685967 http://hdl.handle.net/11408/1668 |
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