A comparison of different tests to evaluate the apparent surface area of activated carbons

✍ Scribed by M. Molina-Sabio; C.Salinas-Martínez de Lecea; F. Rodríguez-Reinoso; C. Puente-Ruiz; A.Linares Solano

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 609 KB
• Volume: 23
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(85)90202-7

✦ Synopsis

Activated carbons of very different nature and pore size distribution have been characterized by gas adsorption and by adsorption from solution; the results have been compared with a simpler method proposed by Puri (retention of ethylene glycol) and a new test proposed here (retention of n-nonane). For carbons with a very narrow microporosity both N? and CO? give similar values of surface areas and, in general. larger than the other adsorbates. When the micropore size distribution is wider, as is usual in commercial activated carbons. the use of N,. para-nitrophenol (PNP) and iodine lead to similar results and comparable with the simpler ethylene glycol and n-nonane retention. For carbons with a very wide microporosity, the ethylene glycol and n-nonane surface areas are lower than the NL areas and more similar to the CO, surface areas.