Open AccessTreatment of Activated Carbon with H2O2. Effect on the Porous Texture
Author(s) -
V. Gómez-Serrano,
M. Acedo-Ramos,
A.J. López-Peinado,
C. Valenzuela-Calahorro
Publication year - 1997
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361749701500202
Subject(s) - chemistry , porosimetry , oxidizing agent , adsorption , activated carbon , aqueous solution , texture (cosmology) , porosity , mesoporous material , nuclear chemistry , hydrogen sulfide , analytical chemistry (journal) , inorganic chemistry , chemical engineering , chromatography , porous medium , catalysis , organic chemistry , artificial intelligence , computer science , image (mathematics) , sulfur , engineering
The effect of the oxidation of activated carbon (AC) with aqueous solutions of H 2 O 2 on the porous texture of the material has been investigated. In such treatments of AC, H 2 O 2 solutions of varying concentration and pH (i.e., unchanged pH and pH values of 2.5 and 11.5) were used. Oxidizing solutions containing Fe 2+ , Fe 3+ , ethanol or ether were also employed. Initial outgassing of AC and contact of the intermediate product with the oxidizing solution were effected under controlled conditions of temperature and time. The resulting samples were characterized texturally by gas adsorption (N 2 , 77 K) and mercury porosimetry. The mass of sample significantly increased when H 2 O 2 solutions at pH 2.5 were used. Such treatment of AC produced a loss of microporosity or none depending on the method of preparation of the samples. Thus, a loss of microporosity occurred, for example, when contact between the H 2 O 2 solution and the AC was effected at 0°C, whereas no loss of microporosity occurred when the temperature was 70°C. For a few samples the unfavourable effect of oxidation of the AC on its porous texture not only concerned the micropores but also the mesopores and macropores.