Resumen de Sorção de chumbo numa sílica modificada obtida da crisotila: aplicação de isotermas

Edson Cavalcanti da Silva Filho, Antônio Wuiston Martins Fortes, Luizângela da Silva Reis, Maria Rita de Morais Chaves Santos, Luiz de Sousa Santos Júnior, Maria Gardênnia da Fonseca

• português

  Uma sílica foi modificada com três alcoxissilanos com diferentes quantidades de nitrogênio, onde a sílica foi obtida da lixiviação ácida da crisotila (amianto). As sílicas modificadas foram aplicadas na remoção de chumbo de soluções aquosas, obtendo-se as seguintes capacidades: 1,41, 0,78 e 0,60 mmol g-1 para os materiais contendo 3, 1 e 2 átomos de nitrogênios nas cadeias orgânicas, respectivamente. As isotermas foram ajustadas usando diferentes modelos, onde cada material mostrou afinidade a um modelo. As interações foram favoráveis e espontâneas a partir do modelo de Freundlich e da energia livre de Gibbs, respectivamenteSorption of lead on modified silica obtained from chrysotile: isotherms applicationAbstractA silica was modified with three alcoxysilanes with different quantities of nitrogen, whose the silica obtained from chrysotile acid leaching. The modified silicas were applied in lead removal from aqueous solution, obtained the following capacities: 1.41, 0.78 e 0.60 mmol g-1 for the materials containing 3, 1 and 2 nitrogen in organic chains, respectively. The isotherms were adjusted using different models, and each material showed affinity to a model. The interactions were favorable and spontaneous from Freundlich model and Gibbs free energy, respectively.

• English

  A silica was modified with three alcoxysilanes with different quantities of nitrogen, whose the silica obtained from chrysotile acid leaching. The modified silicas were applied in lead removal from aqueous solution, obtained the following capacities: 1.41, 0.78 e 0.60 mmol g-1 for the materials containing 3, 1 and 2 nitrogen in organic chains, respectively. The isotherms were adjusted using different models, and each material showed affinity to a model. The interactions were favorable and spontaneous from Freundlich model and Gibbs free energy, respectively.