| Revista: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000313375 |
| ISSN: | 0100-4042 |
| Autores: | Lima, Ilauro S1 Ribeiro, Emerson S Airoldi, Claudio |
| Instituciones: | 1Universidade Estadual de Campinas, Instituto de Quimica, Campinas, Sao Paulo. Brasil |
| Año: | 2006 |
| Periodo: | Jun |
| Volumen: | 29 |
| Número: | 3 |
| Paginación: | 501-506 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | The adsorption capacity of a-chitosan and its modified form with succinic anhydride was compared with the traditional adsorbent active carbon by using the dye methylene blue, employed in the textile industry. The isotherms for both biopolymers were classified as SSA systems in the Giles model, more specifically in L class and subgroup 3. The dye concentration in the supernatant in the adsorption assay was determined through electronic spectroscopy. By calorimetric titration thermodynamic data of the interaction between methyene blue and the chemically modified chitosan at the solid/liquid interface were obtained. The enthalpy of the dye/chitosan interaction gave 2.47 ± 0.02 kJ mol-1 with an equilibrium constant of 7350 ± 10 and for the carbon/dye interaction this constant gave 5951 ± 8. The spontaneity of these adsorptions are reflected by the free Gibbs energies of -22.1 ± 0.4 and -21.5 ± 0.2 kJ mol-1, respectively, found for these systems. This new adsorbent derived from a natural polysaccharide is as efficient as activated carbon. However 97% of the bonded dye can be eluted by sodium chloride solution, while this same operation elutes only 42% from carbon. Chitosan is efficient in dye removal with the additional advantage of being cheap, non-toxic, biocompatible and biodegradable |
| Disciplinas: | Química |
| Palabras clave: | Ingeniería química, Industria textil, Azul de metileno, Adsorción, Quitosana, Anhídrido succínico |
| Keyword: | Chemistry, Chemical engineering, Textile industry, Methylene blue, Adsorption, Chitosan, Succinic anhydride |
| Texto completo: | Texto completo (Ver HTML) |
