A kinetic and equilibrium study of zinc removal by brazilian bentonite clay
This paper aimed to study the removal of zinc using bentonite clay from the Northeastern Brazil, as an adsorbent. A study of the clay subjected to thermal and chemical treatment was performed in order to evaluate the optimization of the adsorption capacity of this material. For the evaluation of the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2012-01-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012005000148 |
| _version_ | 1811275232523059200 |
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| author | Ana Lucia Pereira de Araujo Marcelino Luiz Gimenes Maria Angelica Simões Dornellas de Barros Meuris Gurgel Carlos da Silva |
| author_facet | Ana Lucia Pereira de Araujo Marcelino Luiz Gimenes Maria Angelica Simões Dornellas de Barros Meuris Gurgel Carlos da Silva |
| author_sort | Ana Lucia Pereira de Araujo |
| collection | DOAJ |
| description | This paper aimed to study the removal of zinc using bentonite clay from the Northeastern Brazil, as an adsorbent. A study of the clay subjected to thermal and chemical treatment was performed in order to evaluate the optimization of the adsorption capacity of this material. For the evaluation of the kinetic equilibrium of the process, experimental tests were carried out in a finite bath system. The maximum amount of metal adsorbed was 0.151 mEq of metal per gram of calcined clay and 0.257 mEq of metal per gram of sodium saturated clay. The kinetic models of pseudo-first order, pseudo-second order and intraparticle diffusion were fitted to experimental data, and the pseudo-second order model provided the best result. The Langmuir and Freundlich models were used for the adsorption equilibrium analysis, and the Langmuir model provided the best fit for sorption isotherms. The physicochemical characterization of clay involved X-ray diffraction, scanning electron microscopy, chemical analysis by energy-dispersive X-ray spectroscopy, helium pyconometry and thermogravimetric analysis. The modified clay has potential use for removing Zn2+ ions replacing more expensive adsorbents, since good adsorption properties will be also associated with great availability and low cost. |
| first_indexed | 2024-04-12T23:34:15Z |
| format | Article |
| id | doaj.art-d6856bb137c645089406fd5dde0d251f |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-04-12T23:34:15Z |
| publishDate | 2012-01-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-d6856bb137c645089406fd5dde0d251f2022-12-22T03:12:11ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392012-01-01ahead010.1590/S1516-14392012005000148A kinetic and equilibrium study of zinc removal by brazilian bentonite clayAna Lucia Pereira de AraujoMarcelino Luiz GimenesMaria Angelica Simões Dornellas de BarrosMeuris Gurgel Carlos da SilvaThis paper aimed to study the removal of zinc using bentonite clay from the Northeastern Brazil, as an adsorbent. A study of the clay subjected to thermal and chemical treatment was performed in order to evaluate the optimization of the adsorption capacity of this material. For the evaluation of the kinetic equilibrium of the process, experimental tests were carried out in a finite bath system. The maximum amount of metal adsorbed was 0.151 mEq of metal per gram of calcined clay and 0.257 mEq of metal per gram of sodium saturated clay. The kinetic models of pseudo-first order, pseudo-second order and intraparticle diffusion were fitted to experimental data, and the pseudo-second order model provided the best result. The Langmuir and Freundlich models were used for the adsorption equilibrium analysis, and the Langmuir model provided the best fit for sorption isotherms. The physicochemical characterization of clay involved X-ray diffraction, scanning electron microscopy, chemical analysis by energy-dispersive X-ray spectroscopy, helium pyconometry and thermogravimetric analysis. The modified clay has potential use for removing Zn2+ ions replacing more expensive adsorbents, since good adsorption properties will be also associated with great availability and low cost.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012005000148X-ray diffractionadsorptionzincBofe clay |
| spellingShingle | Ana Lucia Pereira de Araujo Marcelino Luiz Gimenes Maria Angelica Simões Dornellas de Barros Meuris Gurgel Carlos da Silva A kinetic and equilibrium study of zinc removal by brazilian bentonite clay Materials Research X-ray diffraction adsorption zinc Bofe clay |
| title | A kinetic and equilibrium study of zinc removal by brazilian bentonite clay |
| title_full | A kinetic and equilibrium study of zinc removal by brazilian bentonite clay |
| title_fullStr | A kinetic and equilibrium study of zinc removal by brazilian bentonite clay |
| title_full_unstemmed | A kinetic and equilibrium study of zinc removal by brazilian bentonite clay |
| title_short | A kinetic and equilibrium study of zinc removal by brazilian bentonite clay |
| title_sort | kinetic and equilibrium study of zinc removal by brazilian bentonite clay |
| topic | X-ray diffraction adsorption zinc Bofe clay |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012005000148 |
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