Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbents
The present study investigates the possibility of using leaf, bark and seed of <i>Moringa stenopetala</i> as alternative adsorbents for removal of Ni(II) from aqueous solutions. The optimum adsorption conditions for removal of Ni(II) were found to be 30, 20 and 50 mg/L initial concentrat...
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| Format: | Article |
| Language: | English |
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Chemical Society of Ethiopia
2013-04-01
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| Series: | Bulletin of the Chemical Society of Ethiopia |
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| Online Access: | http://www.ajol.info/index.php/bcse/article/view/84072 |
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| author | A. A. Mengistie B. H. Aregawi |
| author_facet | A. A. Mengistie B. H. Aregawi |
| author_sort | A. A. Mengistie |
| collection | DOAJ |
| description | The present study investigates the possibility of using leaf, bark and seed of <i>Moringa stenopetala</i> as alternative adsorbents for removal of Ni(II) from aqueous solutions. The optimum adsorption conditions for removal of Ni(II) were found to be 30, 20 and 50 mg/L initial concentration, 1.5, 2 and 2.5 g adsorbent dose, 250, 250 and 300 rpm agitation speed, 90, 120 and 90 min contact time, 40, 30 and 23 <sup>o</sup>C temperature and pH of 5, 6 and 6 using leaf, bark and seed as adsorbent, respectively. At optimum experimental conditions the percent adsorption of synthetic wastewater sample was found to be 93.90, 96.25 and 97.50 for leaf, bark and seed, respectively. The tested experimental data best fits to pseudo-second order (R<sup>2</sup> > 0.98) than pseudo-first order, Elovich and intraparticle diffusion kinetic models indicating rate limiting step to be chemisorption. It also fits to Langmuir (R<sup>2</sup> > 0.895 using adsorbate variation and also R<sup>2</sup> > 0.998 using both time and temperature variation data) than Freundlich, Temkin and D-R isotherm models. D-R isotherm and thermodynamic study reveals formation of physical adsorption. Hence the adsorption mechanism could be regarded as physico-chemical adsorption process. The adsorption results of industrial wastewater also reveal that for removal of nickel 83% and 85% was obtained using bark and seed adsorbents, respectively. The new method of adsorption developed in this study is cheap, fast and environmental friendly.DOI: http://dx.doi.org/10.4314/bcse.v27i1.4 |
| first_indexed | 2024-04-13T19:36:14Z |
| format | Article |
| id | doaj.art-18811f0375154bd2b0f9b2bdb1fc5f32 |
| institution | Directory Open Access Journal |
| issn | 1011-3924 1726-801X |
| language | English |
| last_indexed | 2024-04-13T19:36:14Z |
| publishDate | 2013-04-01 |
| publisher | Chemical Society of Ethiopia |
| record_format | Article |
| series | Bulletin of the Chemical Society of Ethiopia |
| spelling | doaj.art-18811f0375154bd2b0f9b2bdb1fc5f322022-12-22T02:33:00ZengChemical Society of EthiopiaBulletin of the Chemical Society of Ethiopia1011-39241726-801X2013-04-012713547Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbentsA. A. MengistieB. H. AregawiThe present study investigates the possibility of using leaf, bark and seed of <i>Moringa stenopetala</i> as alternative adsorbents for removal of Ni(II) from aqueous solutions. The optimum adsorption conditions for removal of Ni(II) were found to be 30, 20 and 50 mg/L initial concentration, 1.5, 2 and 2.5 g adsorbent dose, 250, 250 and 300 rpm agitation speed, 90, 120 and 90 min contact time, 40, 30 and 23 <sup>o</sup>C temperature and pH of 5, 6 and 6 using leaf, bark and seed as adsorbent, respectively. At optimum experimental conditions the percent adsorption of synthetic wastewater sample was found to be 93.90, 96.25 and 97.50 for leaf, bark and seed, respectively. The tested experimental data best fits to pseudo-second order (R<sup>2</sup> > 0.98) than pseudo-first order, Elovich and intraparticle diffusion kinetic models indicating rate limiting step to be chemisorption. It also fits to Langmuir (R<sup>2</sup> > 0.895 using adsorbate variation and also R<sup>2</sup> > 0.998 using both time and temperature variation data) than Freundlich, Temkin and D-R isotherm models. D-R isotherm and thermodynamic study reveals formation of physical adsorption. Hence the adsorption mechanism could be regarded as physico-chemical adsorption process. The adsorption results of industrial wastewater also reveal that for removal of nickel 83% and 85% was obtained using bark and seed adsorbents, respectively. The new method of adsorption developed in this study is cheap, fast and environmental friendly.DOI: http://dx.doi.org/10.4314/bcse.v27i1.4http://www.ajol.info/index.php/bcse/article/view/84072<i>Moringa stenopetala</i>Ni(II) adsorptionIsothermsKineticsThermodynamicsIndustrial wastewater |
| spellingShingle | A. A. Mengistie B. H. Aregawi Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbents Bulletin of the Chemical Society of Ethiopia <i>Moringa stenopetala</i> Ni(II) adsorption Isotherms Kinetics Thermodynamics Industrial wastewater |
| title | Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbents |
| title_full | Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbents |
| title_fullStr | Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbents |
| title_full_unstemmed | Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbents |
| title_short | Removal of Ni(II) from aqueous solution using leaf, bark and seed of <i>Moringa stenopetala</i> adsorbents |
| title_sort | removal of ni ii from aqueous solution using leaf bark and seed of i moringa stenopetala i adsorbents |
| topic | <i>Moringa stenopetala</i> Ni(II) adsorption Isotherms Kinetics Thermodynamics Industrial wastewater |
| url | http://www.ajol.info/index.php/bcse/article/view/84072 |
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