Comportamento térmico da caulinita hidratada

Química Nova

José Eduardo Gardolinski¹  Harley Paiva Martins Filho¹  Fernando Wypych¹ 

[1] ,Universidade Federal do Paraná Departamento de Química Curitiba PR

关键词: kaolinite;    clay minerals;    intercalation compounds;   

DOI  :  10.1590/S0100-40422003000100007

来源: SciELO

【 摘 要 】

Well-ordered kaolinite from the Brazilian Amazon Region (State of Pará) was initially reacted at 60 °C with a water dimethylsulfoxide mixture. After washing and characterisation, the resulting material was washed several times with methanol and in the final step with water. The water molecules displace the previously dimethylsulfoxide intercalated molecules and two different hydrated kaolinites were obtained. An unstable phase characterized by an interplanar basal distance of 0,996 nm that after drying collapse to the stable 0,844 nm hydrated kaolinite. The dehydration of the sample to disordered kaolinite was accompanied by Powder X-ray Diffractometry, thermal analysis (simultaneous TG and DSC) and FTIR spectroscopy.

【 授权许可】

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