Abstract
The adsorption of 2-(4′-dimethylaminostyryl)benzoxazole (DMASBO) and its benzothiazole analogue (DMASBT) onto Na-montmorillonite (Na +-MMT) was studied. The adsorption data have been fitted with Freundlich and Dubinin–Radushkevich ( D– R) equation to find the characteristic parameters of each model. From D– R isotherm, it was concluded that the adsorption is of chemical nature. The equilibrium adsorption constant, K c , was determined and has been used to calculate the enthalpy and entropy of the adsorption process. The mechanism of the adsorption has been investigated by fluorescence, IR, X-ray and ESR spectroscopic measurements. These measurements indicate oxidation of the styryl dyes by the Lewis acidic sites of the clay and formation of radical cations at Na +-MMT surface without intercalation into the interior.
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