RESUMO
Teak leaves (Tectona grandis) abundantly available in India showed high sorption capacity for lead ions and were found efficient for the removal of lead ions from aqueous solutions. The extent of removal was found to be dependent on pH, temperature, concentration of metal ions and the dose of adsorbent. Thermodynamic parameters were calculated at different temperatures. The sorbent once used can be regenerated and recycled two - three times almost with the same capacity. However, regeneration by column operation gave better results than batch process.
Assuntos
Adsorção , Asteraceae/metabolismo , Chumbo/análise , Folhas de Planta/metabolismo , Árvores/metabolismo , Poluentes Químicos da Água/análise , Biodegradação Ambiental , Biotecnologia/métodos , Concentração de Íons de Hidrogênio , Metais/análise , Prótons , Temperatura , Termodinâmica , Fatores de Tempo , Purificação da ÁguaRESUMO
Adsorption behaviour of Ni(II), Zn(II), Cd(II) and Cr(VI) on untreated and phosphate-treated rice husk (PRH) showed that adsorption of Ni(II) and Cd(II) was greater when PRH was used as an adsorbent. Sorption of Cd(II) was dependent on contact time, concentration, temperature, adsorbent doses and pH of the solution. The Langmuir constants and thermodynamic parameters have been calculated at different temperatures. It was found that recovery of Cd(II) from synthetic wastewater by column operation was better than a batch process.
