CASCA DE ARROZ COMO ADSORVENTE PARA ÍONS DE METAIS PESADOS: Caracterização e modificação química / RICE HUSK AS ADSORBENTS FOR HEAVY METAL IONS: characterization and chemical modification

AUTOR(ES)

Rosiane Silva Penha

DATA DE PUBLICAÇÃO

2009

RESUMO

Adsorption of some metal ions (Co2+, Ni2+, Cu2+ e Zn2+) from aqueous solutions (pH 5.0) onto in nature rice husk (0.088 < <0.177 mm) was investigated. All experiments were conducted by the batch adsorption techniques at room temperature (28  1C) and under constant stirring. The adsorption amounts were determined using atomic absorption spectroscopy. The Adsorption data were studied using two well-known adsorption models: Langmuir and Freundlich. The results showed that the metal ions uptake processes mediated by rice husks were fitted Freundlich isotherm model, suggesting that all adsorptions are governed by weak electrostatic interactions. According to the equilibrium studies, the selectivity sequence can be given as: Ni2+ (0.08 mmol g-1)

ASSUNTO(S)

rice husk casca de arroz isotermas adsorption quimica analitica isotherm models metais pesados adsorção heavy metals

Documentos Relacionados

• ModificaÃÃo quÃmica da goma do angico (Anadenanthera macrocarpa Benth): utilizaÃÃo como adsorvente de metais pesados.
• Preparation of organically modified silica from rice husk with capacity to sorption of metallic ions.
• Characterization of residual ash from rice husk burning for mortal production
• Vidros óxidos de metais pesados contendo nanopartículas de metais de transição, para aplicações em fotônica
• Remoção de metais pesados em efluentes sintéticos utilizando vermiculita como adsorvente