Thermal behavior of hydrated kaolinite

Quimica nova

Martins Filho, Harley Paiva¹  Wypych, Fernando¹  Gardolinski, José Eduardo¹ 

[1] Universidade Federal do Paraná, Curitiba

关键词: kaolinite;    clay minerals;    intercalation compounds.;   

DOI  :  10.1590/S0100-40422003000100007

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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

【 授权许可】

CC BY