Abstract
The study of IR spectra in the range of 400 to 1700 cm −1 of cation exchanged natural clinoptilolite-heulandite samples has shown the influence of the characteristics of cations and their content in the frequency and transmittance of vibration modes of zeolite. The 450 cm −1 band assigned to T-O internal bending, 1205 cm −1 band of T-O internal asymmetric stretching, and 1640 cm −1 band of OH bending, were most affected by the cation exchange and thermal history of the sample.
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