: Several samples of activated carbon (AC), previously outgassed and treated with solutions of varying concentration, were prepared. The H 2 SO 4 contact between the phases and the outgassing of AC were carried out under controlled conditions. The chemical composition and the thermal behaviour as well as the texture of the samples were studied. Techniques used were chemical analysis, FT-IR spectroscopy, thermogravimetric analysis, gas adsorption, mercury porosimetry and density measurements. After the contact of H 2 SO 4 solutions with AC, the mass of samples increased greatly. It was associated with the uptake by AC of components of the solution, especiallyThe pres-H 2 SO 4 . ence in the samples of and ions was shown by the FT-IR spectra. HSO 4 SO 4 2T he mass increase was strongly dependent on the method of preparation of the samples. In the heat treatment of the samples between 30 and 800¡C a great mass loss occurred below 400¡C. However, it was small at higher temperatures and when the samples were outgassed at 120¡C for 12 h, at 133 ] 10~3 Pa. The introduction of solution in AC pores produced a drastic reduction in the H 2 SO 4 surface area and in the microporosity of the material. It also a †ected the poresize distribution in the mesopore and macropore ranges.
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