Immersion enthalpy variation of surface-modified mineral activated carbon in lead (II) aqueous solution adsorption: the relation between immersion enthalpy and adsorption capacity
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| Format: | Artículo científico |
| Language: | en |
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Universidade Estadual Paulista Júlio de Mesquita Filho
2006
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| author | L. Giraldo |
| author_facet | L. Giraldo |
| contents | Immersion enthalpy variation of surface-modified mineral activated carbon in lead (II) aqueous solution adsorption: the relation between immersion enthalpy and adsorption capacity L. Giraldo J.C. Moreno-Piraján Química surface modified Pb2+ adsorption Langmuir isotherm immersion enthalpy An activated carbon was obtained by chemical activation with phosphoric acid, CM, froma mineral carbon. Afterwards, the carbon was modified with 2 and 5 molL-1, CMox2 and CMox5 nitricacid solutions to increase the surface acid group contents. Immersion enthalpy at pH 4 values and Pb2+adsorption isotherms were determined by immersing activated carbons in aqueous solution. Thesurface area values of the adsorbents and total pore volume were approximately 560 m2.g-1 and 0.36cm3g-1, respectively. As regards chemical characteristics, activated carbons had higher acid sitescontent, 0.92-2.42 meq g-1, than basic sites, 0.63-0.12 meq g-1. pH values were between 7.4 and 4.5 atthe point of zero charge, pHPZC. The adsorbed quantity of Pb2+ and the immersion enthalpy in solutionof different pH values for CM activated carbon showed that the values are the highest for pH 4, 15.7mgg-1 and 27.6 Jg-1 respectively. Pb2+ adsorption isotherms and immersion enthalpy were determinedfor modified activated carbons and the highest values were obtained for the activated carbon thatshowed the highest content of total acid sites on the surface. 2006 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42931402 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.4 Vol.31 |
| format | Artículo científico |
| id | redalyc_42931402 |
| language | en |
| publishDate | 2006 |
| publisher | Universidade Estadual Paulista Júlio de Mesquita Filho |
| spellingShingle | Immersion enthalpy variation of surface-modified mineral activated carbon in lead (II) aqueous solution adsorption: the relation between immersion enthalpy and adsorption capacity L. Giraldo Química surface modified Pb2+ adsorption Langmuir isotherm immersion enthalpy Immersion enthalpy variation of surface-modified mineral activated carbon in lead (II) aqueous solution adsorption: the relation between immersion enthalpy and adsorption capacity L. Giraldo J.C. Moreno-Piraján Química surface modified Pb2+ adsorption Langmuir isotherm immersion enthalpy An activated carbon was obtained by chemical activation with phosphoric acid, CM, froma mineral carbon. Afterwards, the carbon was modified with 2 and 5 molL-1, CMox2 and CMox5 nitricacid solutions to increase the surface acid group contents. Immersion enthalpy at pH 4 values and Pb2+adsorption isotherms were determined by immersing activated carbons in aqueous solution. Thesurface area values of the adsorbents and total pore volume were approximately 560 m2.g-1 and 0.36cm3g-1, respectively. As regards chemical characteristics, activated carbons had higher acid sitescontent, 0.92-2.42 meq g-1, than basic sites, 0.63-0.12 meq g-1. pH values were between 7.4 and 4.5 atthe point of zero charge, pHPZC. The adsorbed quantity of Pb2+ and the immersion enthalpy in solutionof different pH values for CM activated carbon showed that the values are the highest for pH 4, 15.7mgg-1 and 27.6 Jg-1 respectively. Pb2+ adsorption isotherms and immersion enthalpy were determinedfor modified activated carbons and the highest values were obtained for the activated carbon thatshowed the highest content of total acid sites on the surface. 2006 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42931402 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.4 Vol.31 |
| title | Immersion enthalpy variation of surface-modified mineral activated carbon in lead (II) aqueous solution adsorption: the relation between immersion enthalpy and adsorption capacity |
| topic | Química surface modified Pb2+ adsorption Langmuir isotherm immersion enthalpy |
| url | https://www.redalyc.org/articulo.oa?id=42931402 |