Activated carbon from vetiver roots: gas and liquid adsorption studies.
Large quantities of lignocellulosic residues result from the industrial production of essential oil from vetiver grass (Vetiveria zizanioides) roots. These residues could be used for the production of activated carbon. The yield of char obtained after vetiver roots pyrolysis follows an equation recently developed [A. Ouensanga, L. Largitte, M.A. Arsene, The dependence of char yield on the amounts of components in precursors for pyrolysed tropical fruit stones and seeds, Micropor. Mesopor. Mater. 59 (2003) 85-91]. The N(2) adsorption isotherm follows either the Freundlich law K(F)P(alpha) which is the small alpha equation limit of a Weibull shaped isotherm or the classical BET isotherm. The surface area of the activated carbons are determined using the BET method. The K(F) value is proportional to the BET surface area. The alpha value increases slightly when the burn-off increases and also when there is a clear increase in the micropore distribution width.
Gaspard
S
S
COVACHIMM, EA 3592 Université des Antilles et de la Guyane, BP 250, 97157 Pointe à Pitre Cedex, Guadeloupe. sarra.gaspard@univ-ag.fr
Altenor
S
S
Dawson
E A
EA
Barnes
P A
PA
Ouensanga
A
A
D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D049930:Chrysopogon; D003247:Conservation of Natural Resources; D006358:Hot Temperature; D008751:Methylene Blue / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D019800:Phenol / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry*; D016062:Porosity; D013227:Steam; D013499:Surface Properties; D014866:Waste Products; D014874:Water Pollutants, Chemical / Q000737:chemistry
D013227:Steam; D014866:Waste Products; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D019800:Phenol; D002244:Carbon; D009584:Nitrogen; D008751:Methylene Blue