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Experimental adsorption isotherms were used to evaluate the specific surface  area and the surface fractal dimensions of acid-activated bentonite samples  modified with a heteropoly acid (HPW). The aim of the investigations was to  search for correlations between the specific surface area and the geometric  heterogeneity, as characterized by the surface fractal dimension and the  content of added acid. In addition, mercury intrusion was employed to  evaluate the porous microstructures of these materials. The results from the  Frankel-Halsey-Hill method showed that, in the p/p0 region from 0.75 to 0.96,  surface fractal dimension increased with increasing content of heteropoly  acid. The results from mercury intrusion porosimetry (MIP) data showed the  generation of mesoporous structures with important topographical  modifications, indicating an increase in the roughness (fractal geometry) of  the surface of the solids as a consequence of the modification with the  heteropoly acid. By comparison, MIP is preferable for the characterization  because of its wide effective probing range

Fractal analysis of bentonite modified with heteropoly acid using nitrogen sorption and mercury intrusion porosimetry