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Modeling and optimization of methyl violet 2B removal on activated carbon based neem hulls using Response Surface Methodology (RSM)

Author Affiliations

  • 1Laboratory of Water, Energy, Environnemental and Industrial Processes (LE3PI), Cheikh Anta Diop University (UCAD), Ecole Supérieure Polytechnique (ESP), B.P. 5085 Dakar-Fann, Senegal
  • 2Laboratory of Water, Energy, Environnemental and Industrial Processes (LE3PI), Cheikh Anta Diop University (UCAD), Ecole Supérieure Polytechnique (ESP), B.P. 5085 Dakar-Fann, Senegal and National Polytechnic Institute (INP), National School of Chemical and Technological Arts Engineers (ENSIACET, UMR 1010, Laboratory of Agro-Industrial Chemistry, BP 44362 - 31030 Toulouse Cedex 4, France
  • 3Laboratory of Water, Energy, Environnemental and Industrial Processes (LE3PI), Cheikh Anta Diop University (UCAD), Ecole Supérieure Polytechnique (ESP), B.P. 5085 Dakar-Fann, Senegal and University of Sine Saloum El Hadji Ibrahima Niass (USSEIN), UFR, Fundamental and Engineering Sciences (UF-SFI), BP 55 Kaolack, Senegal
  • 4Amadou Makhtar MBOW University (UAM), B.P. 45 927 Dakar-Nafa-VDN, Dakar, Senegal

Res.J.chem.sci., Volume 13, Issue (1), Pages 35-45, February,18 (2023)


The direct discharge of industrial effluents loaded with dyes into nature constitutes a major environmental pollution problem. Thus, the treatment of these wastewaters is now a necessity to protect of people and the environment. The aim of this study was to determine the optimal operating conditions of the adsorption removal of Methyl Violet (MV) in aqueous solution. The activated carbon adsorbent that used in this study is chemically prepared from neem seed hulls. The Surface Response Methodology (SRM), was used for the optimisation and modelling of the adsorption fixation process of MV on the prepared activated carbon elaborated adsorbent. The effects of the operating parameters such as the initial concentration of MV in the solution (40 - 80mg.L-1), the amount of activated carbon adsorbent (1-2g.L-1), the contact time (50-100 min) and the initial pH of the solution (4 - 8) have been studied. The results for ANOVA analysis has showed that the quadratic model is the best fitting model to describe the fixation of MV on the activated carbon the studied adsorbent. The results has also showed that the adsorption of MV on activated carbon the elaborated adsorbent is strongly influenced by the studied parameters. Indeed, the dose of an activated carbon gets the most significant effect on dye removal. The optimal conditions of MV adsorption correspond to an initial MV concentration of 40.75mg.g-1, an activated carbon dose of 1.78g.L-1, a pH of 4.06 and a adsorption time of 99.40 min and allow a MV removal yield of 99.53 %. Therefore, the MSR can be used to model the removal of MV as a function of the parameters studied and to determine the optimal operating conditions for MV fixation on neem seed shell activated carbon. This study has showed that an activated carbon based on neem hulls is a credible option for the treatment of industrial effluents loaded with dyes.


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