Academic Journal
Comparison of adsorption of Cd(II) and Pb(II) ions on pure and chemically modified fly ashes
| العنوان: | Comparison of adsorption of Cd(II) and Pb(II) ions on pure and chemically modified fly ashes |
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| المؤلفون: | Sočo, Eleonora, Kalembkiewicz, Jan |
| المصدر: | Chemical and Process Engineering ; volume 37, issue 2, page 215-234 ; ISSN 2300-1925 |
| بيانات النشر: | Walter de Gruyter GmbH |
| سنة النشر: | 2016 |
| الوصف: | The study investigates chemical modifications of coal fly ash (FA) treated with HCl or NH 4 HCO 3 or NaOH or Na 2 edta, based on the research conducted to examine the behaviour of Cd(II) and Pb(II) ions adsorbed from water solution on treated fly ash. In laboratory tests, the equilibrium and kinetics were examined applying various temperatures (293 - 333 K) and pH (2 - 11) values. The maximum Cd(II) and Pb(II) ions adsorption capacity obtained at 293 K, pH 9 and mixing time 2 h from the Langmuir model can be grouped in the following order: FA-NaOH > FA-NH 4 HCO 3 > FA > FA-Na 2 edta > FA-HCl. The morphology of fly ash grains was examined via small-angle X-ray scattering (SAXS) and images of scanning electron microscope (SEM). The adsorption kinetics data were well fitted by a pseudo-second-order rate model but showed a very poor fit for the pseudofirst order model. The intra-particle model also revealed that there are two separate stages in the sorption process, i.e. the external diffusion and the inter-particle diffusion. Thermodynamics parameters such as free energy, enthalpy and entropy were also determined. A laboratory test demonstrated that the modified coal fly ash worked well for the Cd(II) and Pb(II) ion uptake from polluted waters. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| DOI: | 10.1515/cpe-2016-0018 |
| الاتاحة: | http://dx.doi.org/10.1515/cpe-2016-0018 http://content.sciendo.com/view/journals/cpe/37/2/article-p215.xml https://www.degruyter.com/view/j/cpe.2016.37.issue-2/cpe-2016-0018/cpe-2016-0018.pdf |
| Rights: | http://creativecommons.org/licenses/by-nc-nd/3.0 |
| رقم الانضمام: | edsbas.ACF1E98 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1515/cpe-2016-0018 |
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