Esfoliação e hidratação da caulinita após intercalação com uréia

Química Nova

José E. Gardolinski²  Fernando Wypych²  Maurício P. Cantão¹ 

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

关键词: kaolinite;    aluminosilicate;    layered materials;   

DOI  :  10.1590/S0100-40422001000600010

来源: SciELO

【 摘 要 】

Well-ordered Georgia kaolinite (Kga-1b) obtained from the source Clay Repository of the Clay Minerals Society (USA) was intercalated with urea using grinding procedures. To achieve complete intercalation 20% of urea (in weight) was used, producing Al2Si2O5(OH)4 (N2H4CO)0,86 with an interplanar basal spacing of 1,08nm. After washing with water under ultrasound stirring at 363K, urea was completely removed and kaolinite was partially exfoliated. After drying under air, the material was converted to hydrated kaolinite with the composition Al2Si2O5(OH)4 (H2O)0,64 and an interplanar basal spacing of 0,84nm. In this compound, water molecules positioned between the layers of the silicate can be removed after calcination at 573K, regenerating structurally disordered kaolinite.

【 授权许可】

CC BY-NC   
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