Uso da cinza da casca do arroz (CCA) obtida da geração de energia térmica como adsorvente de Zn(II) em soluções aquosas
| Autor: | Chaves, Thiago Faheina, Queiroz, Zilvanir Fernandes de, Sousa, Diana Nara Ribeiro de, Girão, José Hélio Saraiva, Rodrigues, Esiana de Almeida |
|---|---|
| Jazyk: | portugalština |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Química Nova v.32 n.6 2009 Química Nova Sociedade Brasileira de Química (SBQ) instacron:SBQ Química Nova, Volume: 32, Issue: 6, Pages: 1378-1383, Published: 2009 |
| Popis: | The removal study was conducted using 1.00 g of the rice husk ash (RHA) and 20.0 mL solution with concentrations in the range of 10-1000 mg/L of Zn(II). The influence of contact time, initial metal concentration, agitation and pH of the removal process was investigated. Superior removals to 95% were obtained at the end of 24 h of contact. The agitation increased in 20% the removal of Zn(II), being needed only 5 min to reach the equilibrium. The adsorption process was studied by the models of isotherms of Langmuir, Freundlich and BET, obtaining results of R L and 1/n for a process favorable of adsorption. BET isotherm best represents the equilibrium adsorption. The results showed that the RHA has the largest capacity and affinity for the removal of Zn(II). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|