Adsorption of isoniazid onto sepiolite-palygorskite group of clays: An IR study.
The adsorption of isoniazid (INH) on sepiolite, loughlinite (natural Na-sepiolite) and palygorskite from Anatolia was investigated by FT-IR spectroscopy. Experimental results indicated that INH molecules, adsorbed on sepiolite-palygorskite group of clays, are coordinated to surface hydroxyls by H-bonding interaction through the pyridine ring nitrogen lone pairs. Moreover, some of the adsorbed INH molecules may enter the interior channels of the sepiolite-palygorskite structure and involve H-bonding interaction with zeolitic water. Some intensity and frequency changes in the OH stretching band of surface hydroxyls (Si-OH) of the INH-treated sepiolite and loughlinite were observed. However, this band is found to be less affected by the adsorption of isoniazid in the case of palygorskite, probably because the surface Si-OH groups in palygorskite appear to be less abundant than in sepiolite or loughlinite.
Istanbul Kultur University, Science and Letters Faculty, Department of Physics, 34156 Istanbul, Turkey. s.akyuz@iku.edu.tr
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D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D007538:Isoniazid / Q000737:chemistry*; D017616:Magnesium Compounds / Q000737:chemistry*; D017633:Magnesium Silicates / Q000737:chemistry*; D008958:Models, Molecular; D017655:Silicon Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
D000538:Aluminum Silicates; D017616:Magnesium Compounds; D017633:Magnesium Silicates; D017655:Silicon Compounds; C001671:magnesium trisilicate; D000077215:Clay; C026325:attapulgite; D007538:Isoniazid