Removal of cobalt from lubricating oil by the use of bentonite: equilibrium, kinetic and adsorption preliminary studies
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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedade Brasileira de Proteção Radiológica - SBPR
2019
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| _version_ | 1876452382186930176 |
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| author | Valeria Cuccia |
| author_facet | Valeria Cuccia |
| contents | Removal of cobalt from lubricating oil by the use of bentonite: equilibrium, kinetic and adsorption preliminary studies Valeria Cuccia Sandro Rogério Novaes Seles Ana Claudia Queiroz Ladeira Biología cobalt Lubricating oil waste management bentonite sorption Radionuclides may contaminate lubricating oils in nuclear power plants. In Brazil, this kind of waste has been stored in the generator’s facilities, awaiting treatment alternatives. This work intends to investigate a process to treat it for the final deposition using bentonite as a sorbent material. Considerable volume reduction of the radioactive waste is to be attained, because the process results in decontaminated oil, free from radiological control, and radioactive loaded sorbent. The study focuses in cobalt removal from a simulated oil waste (non-active). The production of the simulated waste is described. Bentonite was used for equilibrium time determination, kinetic and adsorption studies. Cobalt adsorption equilibrium was rapidly attained after 30 minutes. The data was used for modelling the system’s kinetic, applying the pseudo first and pseudo second order equation models. Experimental data fitted to pseudo second order model, supporting the assumption that the adsorption is due to chemisorption. Batch sorption tests were conducted, and the results fitted to Langmuir and Freundlich sorption models. Both isotherm models chosen for this work did not fit to the experimental data. Thus, these are preliminary results and the studies must be repeated to evaluate data variability and better statistical inference. Although, bentonite still has considerable potential as sorbent for the removal of cobalt from lubricating oil. Finally, the results might be extended to other kinds of radioactive oils and radioactive organic wastes. 2019 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280838039 en http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2A Vol.7 |
| format | Artículo científico |
| id | redalyc_722280838039 |
| institution | Redalyc |
| language | en |
| publishDate | 2019 |
| publisher | Sociedade Brasileira de Proteção Radiológica - SBPR |
| spellingShingle | Removal of cobalt from lubricating oil by the use of bentonite: equilibrium, kinetic and adsorption preliminary studies Valeria Cuccia Biología cobalt Lubricating oil waste management bentonite sorption Removal of cobalt from lubricating oil by the use of bentonite: equilibrium, kinetic and adsorption preliminary studies Valeria Cuccia Sandro Rogério Novaes Seles Ana Claudia Queiroz Ladeira Biología cobalt Lubricating oil waste management bentonite sorption Radionuclides may contaminate lubricating oils in nuclear power plants. In Brazil, this kind of waste has been stored in the generator’s facilities, awaiting treatment alternatives. This work intends to investigate a process to treat it for the final deposition using bentonite as a sorbent material. Considerable volume reduction of the radioactive waste is to be attained, because the process results in decontaminated oil, free from radiological control, and radioactive loaded sorbent. The study focuses in cobalt removal from a simulated oil waste (non-active). The production of the simulated waste is described. Bentonite was used for equilibrium time determination, kinetic and adsorption studies. Cobalt adsorption equilibrium was rapidly attained after 30 minutes. The data was used for modelling the system’s kinetic, applying the pseudo first and pseudo second order equation models. Experimental data fitted to pseudo second order model, supporting the assumption that the adsorption is due to chemisorption. Batch sorption tests were conducted, and the results fitted to Langmuir and Freundlich sorption models. Both isotherm models chosen for this work did not fit to the experimental data. Thus, these are preliminary results and the studies must be repeated to evaluate data variability and better statistical inference. Although, bentonite still has considerable potential as sorbent for the removal of cobalt from lubricating oil. Finally, the results might be extended to other kinds of radioactive oils and radioactive organic wastes. 2019 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280838039 en http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2A Vol.7 |
| title | Removal of cobalt from lubricating oil by the use of bentonite: equilibrium, kinetic and adsorption preliminary studies |
| topic | Biología cobalt Lubricating oil waste management bentonite sorption |
| url | https://www.redalyc.org/articulo.oa?id=722280838039 |