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Study and Characterisation of Activated Carbon Treated with H 2 SO 4 Solutions
Author(s) -
GomezSerrano Vicente,
AcedoRamos Manuel,
LopezPeinado Antonio J.
Publication year - 1997
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199701)68:1<82::aid-jctb596>3.0.co;2-3
Subject(s) - thermogravimetric analysis , porosimetry , outgassing , activated carbon , adsorption , analytical chemistry (journal) , chemistry , carbon fibers , chemical composition , mesoporous material , materials science , nuclear chemistry , porosity , chromatography , composite material , organic chemistry , porous medium , composite number , catalysis
Several samples of activated carbon (AC), previously outgassed and treated with H 2 SO 4 solutions of varying concentration, were prepared. The 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, especially H 2 SO 4 . The presence in the samples of HSO 4 − and SO 4 2− ions was shown by the FT‐IR spectra. The 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 H 2 SO 4 solution in AC pores produced a drastic reduction in the surface area and in the microporosity of the material. It also affected the pore‐size distribution in the mesopore and macropore ranges. © 1997 SCI.