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BIBTEX RIS

Nióbia magnética como adsorvente de contaminantes orgânicos em meio aquoso: efeito da temperatura e do pH

2008; Brazilian Chemical Society; Volume: 31; Issue: 3 Linguagem: Inglês

10.1590/s0100-40422008000300010

ISSN

1678-7064

Autores

Maraísa Gonçalves, Luiz Carlos Alves de Oliveira, Mário César Guerreiro,

Tópico(s)

Iron oxide chemistry and applications

Resumo

TEMPERATURE AND pH.This work describes novel materials based on pure iron oxide and iron oxide/niobia composite to produce a magnetic adsorbent.These materials were prepared with synthetic iron oxide and characterized by powder XRD, SEM, FTIR, TPR and Mössbauer spectroscopy.Results showed that the main iron oxides formed were goethite (αFeOOH) and maghemite (γFe 2 O 3 ) with small particle size.The iron oxide and iron oxide/niobia composite showed high adsorption ability for organic compounds.The positive enthalpy indicated an endothermic adsorption process suggesting physical adsorption.

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