Acid treatments of montmorillonite-rich clay for Fe removal using a factorial design method

Materials Research

Lindiane Bieseki²  Francine Bertell²  Helen Treichel¹  Fabio G. Penha¹  Sibele B. C. Pergher² 

[1] ,Universidade Federal do Rio Grande do Norte Programa de Pós-graduação em Ciências e Engenharia de Materiais Natal RN ,Brasil

关键词: acid treatment;    clay;    montmorillonite;    Fe removal;    central composite design;   

DOI  :  10.1590/S1516-14392013005000114

来源: SciELO

【 摘 要 】

Montmorillonite clays are of great interest for industrial processes such as catalysis and adsorption. The textural properties of clays can be modified in an attempt to increase their uses. This paper describes the acid treatment of natural montmorillonite clay. The materials were characterized using X-ray diffraction (XRD), atomic absorption spectroscopy (AA) and BET surface area measurements. Three different acids (HCl, HNO3 and H2SO4) were tested, and HCl and H2SO4 were more efficient for removing Fe from the clay. The results indicate that HCl better preserves the material structure because less Al is removed. A central composite design (CCD) 2² was applied to evaluate the treatment using HCl. The temperature and concentration presented positive effects on the removal of Fe, Al and Mg. Combinations of the HCl acid solution concentration and temperature, such as 4 mol.L-1/50 °C and 1 mol.L-1/75 °C, assured that Fe was removed with less damage to the structure.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License