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Apr 13, 2018Keywords:
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Elimination du chrome par du charbon actif élaboré et caractérisé à partir de la coque du noyau de <i>Balanites aegyptiaca</i>
Abstract
Le charbon actif élaboré à partir de biomasses lignocellulosiques est une bonne voie de valorisation de déchets, vue ses applications. Ce travail porte sur l’élaboration du charbon actif à partir de Balanites aegyptiaca par activation chimique à l’acide ortho phosphorique, son application pour éliminer le chrome VI
en solution. La concentration de l’acide, le temps d’imprégnation, la température de pyrolyse et le palier d’isotherme ont été variés. La caractérisation a porté sur la détermination des indices d’iode et de bleu de méthylène, des fonctions de surface et de pH au point de charge nulle (pHPCN). Le temps de contact, le pH du milieu, la masse de l’adsorbant et la concentration initiale de la solution ont été variés pour l’élimination du chrome. Les meilleurs indices d’iode et de bleu de méthylène obtenus sont : 989,86 mg/g et 613,17 mg/g respectivement. Les fonctions à la surface des charbons actifs sont de nature acide et leur pHPCN inférieur à 7. Le rendement d’élimination du chrome varie de 81,64% à 98,77% dans les conditions : concentration initiale (70 mg/L), pH = 2, masse (80 mg) et temps (2 h). A titre de comparaison, le charbon actif commercial de marque KGA a donné un taux de rabattement en chrome de 91,49%.
© 2017 International Formulae Group. All rights reserved.
Mots clés: Biomasse, activation chimique, charbon actif
English Title: Elimination of the chromium by the elaborate activated coal and characterized from the c-ockle of the core of Balanites aegyptiaca
English Abstract
Activated coal elaborated from biomasses lignocellulosiques is a good way of valorization of garbage, seen his applications. This work is about the development of the activated coal from Balanites aegyptiaca by chemical activation to ortho phosphoric acid, his application to eliminate the chromium VI in solution. The concentration of acid, the time of impregnation, the temperature of pyrolysis and the landing of isotherm have been varied. The characterization was about the determination of iodine index, methylene blue index, functions of surface and pH to point of zero charge (pHPZC). The time of contact, the pH of the middle, the mass of adsorbent and initial concentration of solution have been varied for the elimination of chromium. The best iodine index and methylene blue index gotten are: 989, 86 mg/g and 613, 17 mg/g respectively. The functions to the surface of activated coals are of acid nature and their pHPZC lower to 7. The chromium elimination output varies from 81, 64% to 98, 77% in the conditions: initial concentration (70 mg/L), pH = 2, mass (80 mg) and time (2 hs). To title of comparison, the commercial activated coal of KGA mark gave a rate of folding in chromium of 91, 49%.
© 2017 International Formulae Group. All rights reserved.
Keywords: Biomass, chemical activation, activated coal
