Determination of structural modification in acid activated montmorillonite clay by FT-IR spectroscopy.
The structural modifications and the Bronsted acid sites generated during the acid treatment of montmorillonite clay with varied concentration of sulphuric acid was determined using FT-IR spectroscopy. Octahedral sheet is affected at low acid concentration resulting into the dissolution of cations; among them Mg2+ cations are prone to dissolve than Fe2+/3+ and Al3+. Tetrahedral sheet is affected at higher acid concentration. The partial substitution of octahedral Al3+ by Mg2+ or Fe2+/3+ cations and the presence of other non-smectite minerals such as kaolinites was also been clearly identified, thus making FT-IR spectroscopy as a rapid technique for monitoring the structural features of montmorillonite clay.
Tyagi
Beena
B
Department of Silicates and Catalysis Discipline, Central Salt and Marine Chemicals Research Institute (CSMCRI), G.B. Marg, 364 002 Bhavnagar, Gujarat, India. btyagi@csmcri.org
Chudasama
Chintan D
CD
Jasra
Raksh V
RV
D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry*; D000077215:Clay; D017640:Silicates / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013464:Sulfuric Acids / Q000737:chemistry*
D000538:Aluminum Silicates; D017640:Silicates; D013464:Sulfuric Acids; D001546:Bentonite; C033214:Smectite; C033158:sulfuric acid; D000077215:Clay