Abstract
Several samples of activated carbon (AC), previously outgassed and treated with H2SO4 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 H2SO4 solutions with AC, the mass of samples increased greatly. It was associated with the uptake by AC of components of the solution, especially H2SO4. The presence in the samples of HSO4− and SO42− 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 H2SO4 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Journal of Chemical Technology & Biotechnology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.