Modelling of the kinetics adsorption of gold (I) cyanide complex ion by active carbons prepared from Parinari macrophylla shells
1 Materials Water and Environment Laboratory, Faculty of Sciences and Technologies, Abdou Moumouni University, 10662 Niamey, Niger.
2 Unit of Research Sustainable Chemistry, LABIRIS, Avenue Gryzon, 1-1070 Brussels, Belgium.
3 Faculty of Sciences and Technologies, Agadez University, 199 Agadez, Niger.
Research Article
World Journal of Advanced Research and Reviews, , 2022, 15(03), 394–406
Article DOI: 10.30574/wjarr.2022.15.3.0941
Publication history:
Received on 15 August 2022; revised on 21 September 2022; accepted on 23 September 2022
Abstract:
Nowadays, one of the sectors to valorization of waste is their transformation in nobler materials rather than in energy. This study is about the valorization of agricultural waste (Parinari Macrophylla shells) for the development of active carbons, the characterization of porous materials gotten and the kinetic study for adsorption of gold (I) cyanide complex ion. The development is made by impregnation in KOH followed of a pyrolysis under flux of N2 or CO2. The characteristics determined for adsorption are iodine index, methylene blue index, pH to point of zero charge (pHPZC) as well as the textures characteristics gotten by adsorption of nitrogen at 77 K. For adsorption of gold (I) cyanide complex ion , the kinetics model’s pseudo-order 1, pseudo-order 2, the model of Elovich and those diffusions of Boyd and Weber-Morris are studied. The results of the characterization showed that samples are basic (pHPZC > 7), present the specific surfaces of 1008 m2/g and 1063 m2/g with percentages in microporous surface more than 78% and for microporous volume more than 71%. The kinetics of adsorption of gold (I) cyanide complex ion (Au(CN)2-) obeys more to pseudo-order 2 model and a multi-linearity of the models of Elovich and diffusions during adsorption.
Keywords:
Biomass; Parinari macrophylla; Active carbon; Gold; Adsorption; Kinetic
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