Magnetic niobia as adsorbent of organic contaminants in aqueous medium: effect of temperature and pH

Química Nova

Guerreiro, Mário César¹  Oliveira, Luiz Carlos Alves¹  Universidade Federal de Lavras, Lavras, Brasil¹  Gonçalves, Maraísa¹ 

关键词: iron oxide;    niobium oxide;    adsorption process.;   

DOI  :  10.1590/S0100-40422008000300010

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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 (aFeOOH) and maghemite (gFe2O3) 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.

【 授权许可】

Unknown