Akalın, ElifAKYÜZ, SEVİMAKYÜZ, ZEKİ TANIL2018-07-262018-07-262014-080970-7077https://doi.org/10.14233/ajchem.2014.16418https://hdl.handle.net/11413/2350The adsorption of 5-fluorouracil (5FU) and 5-bromouracil (5BrU) by sepiolite and loughlinite (natural Na-sepiolite) has been investigated using FT-IR spectrometry. The spectroscopic results indicate that 5-halogenouracils adsorbed on sepiolite and loughlinite are coordinated to surface hydroxyls and/or to Lewis acidic centers by hydrogen bonding interaction through the oxygen lone pairs. Some intensity and frequency changes in the OH stretching and deformation bands of surface hydroxyls (Si-OH) of the 5-fluorouracil and 5-bromouracil treated sepiolite and loughlinite were observed. Adsorption capacity of the sepiolite is found to be higher than loughlinite for 5-halogenuracils. Moreover adsorption capacity of clays were found to decrease in the order 5-fluorouracil >5-bromouracil.en-USAdsorption5-BromouracilClays5-FluorouracilIR spectroscopyLoughliniteSepioliteVibrational-SpectraMontmorilloniteUracil5-ChlorouracilTautomerismDerivativesAcidArticle3437663000713437663000712-s2.0-849069591522-s2.0-84906959152