... temperature and time of activation The bleaching power of an acid- activated bentonite is generally examined on the basis of the b-carotene and chlorophyll adsorption capacities (Gonza´lez-Paradas, Villafranca-Sa´nchez, ... thermodynamics of a smectite mineral Journal of Thermal Analysis and Calorimetry ¨ nal, M., & Sarıkaya, Y (submitted for publication) Noyan, H., O Acid activation thermodynamics of a bentonite Clays and ... bleaching earths has yet appeared The aim of this study is to examine of the bleaching power of some H2SO4-treated bentonite samples by making use of surface area, surface acidity, porosity and...