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Adsorption of Congo Red from Aqueous Solution Using CTAB-Kaolin from Bechar Algeria

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Journal of Surface Engineered Materials and Advanced Technology 2014年第6期4卷 332-341页

作者： Mohamed Amine Zenasni Bahia Meroufel andré merlin Béatrice George Laboratory of Valorisation of Vegetal Resources and Food Security (VRVSA) Bechar University Bechar Algeria Laboratory of Studies and Research on Material Wood (LERMAB) University of Lorraine Nancy France

Cetyltrimethylammonium bromide-modified kaolin (CTAB-kaolin or KC) was prepared and tested as an adsorbent for an anionic dye Congo red (CR) removal from aqueous solution in comparison with natural kaolin (K). The effect of various experimental parameters was investigated using a batch adsorption technique. In this manner, the adsorption isotherms and adsorption kinetics of CR on K and KC were examined. The isothermal data could be well described by the Langmuir equation and the dynamical data fit well with the pseudo-second-order kinetic model. The adsorption capacity of modified kaolin KC (24.46 mg/g) was found to be around 4 times higher than that of natural kaolin K (5.94 mg/g). The KC demonstrated the highest adsorption capacity by removing over 98% of CR after ten minutes of contact. These results indicate that CTAB-kaolin could be employed as low-cost alternative to activated carbon in wastewater treatment for the removal of colour which comes from industrial effluents of textile activities, tanning or printing.

关键词： Adsorption Congo Red Dye Surfactant Kaolin Kinetics

Removal of Zn (II) from Aqueous Solution onto Kaolin by Batch Design

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Journal of Water Resource and Protection 2013年第7期5卷 669-680页

作者： Bahia Meroufel Omar Benali Mohamed Benyahia Mohamed Amine Zenasni andré merlin Béatrice George Department of Chemistry Faculty of Sciences Djillali Liabes University Sidi Bel Abbes Algeria Department of Chemistry Faculty of Sciences Tahar Moulay University Saida Algeria Laboratory of Studies and Research on Material Wood (LERMAB) University of Lorraine Nancy France Laboratory of Valorisation of Vegetal Resources and Food Security (VRVSA) Bechar University Bechar Algeria

The Algerian kaolin clay was investigated to remove Zn(II) heavy metal ion from aqueous solution. The effect of contact time, initial metal ion concentration, pH and temperature was experimentally studied in batch mode to evaluate the adsorption capacity, kinetic, thermodynamic and equilibrium. The extent of zinc adsorption increased with increasing initial concentration of adsorbat, pH and temperature. The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms and both models fitted well. The monolayer adsorption capacity for Zn(II) ions was 12.23 mg per g of kaolin clay at pH 6.1 and 25°C. Dubinin-Radushkevich (D-R) isotherm model was also applied to the equilibrium data. Thermodynamic parameters showed that the adsorption of Zn(II) onto kaolin clay was spontaneous and endothermic process in nature. Furthermore, the Lagergren-first-order and pseudo-second-order models were used to describe the kinetic data. The experimental data fitted well the pseudo-second-order kinetic. As a result, the kaolin clay may be used for removal of zinc from aqueous media.

关键词： Zn(II) Kaolin Adsorption Isotherm Thermodynamic Kinetic

Adsorption of Cu(II) on maghnite from aqueous solution: Effects of pH, initial concentration, interaction time and temperature

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Natural Science 2012年第11期4卷 856-868页

作者： Mohamed Amine Zenasni Said Benfarhi andré merlin Stéphane Molina Béatrice George Bahia Meroufel Institute of Sciences and Technology Department of Sciences Bechar University Bechar Algeria Istitute of Sciences Department of Chemistry Batna University Batna Algeria Laboratory of Studies and Research on Material Wood (LERMAB) University of Lorraine Nancy France nstitute of Sciences and Technology Department of Sciences Bechar University Bechar Algeria

The adsorption behaviour of Cu2+ onto maghnite was conducted under batch conditions. The effect of time, pH of the dispersion, temperature and initial metal concentration on the adsorption of Cu2+ onto maghnite was investigated. In this study, 94% of Cu(II), was adsorbed on the maghnite clay when the equilibrium was reached at 120 min. The adsorption of Cu2+ was a fast process that followed the pseudo-second-order kinetics. This process could be described by the Langmuir model and gave a maximum Cu2+ adsorption capacity of 21.78 mg/g at 293 K. The thermodynamic parameters such as variation of enthalpy ΔH, variation of entropy ΔS and variation of Gibbs free energy ΔG were calculated from the slope and intercept of lnKd vs. 1/T plots. The adsorption was endothermic reaction. The adsorption process for this natural maghnite is more spontaneous because the values of ΔG are less negative. The results suggested that natural maghnite was suitable as sorbent material for the recovery and adsorption of metal ion from aqueous solutions.

关键词： Adsorption Isotherms Natural Maghnite Heavy Metal Cu(II)

Adsorption of Nickel in Aqueous Solution onto Natural Maghnite

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Materials Sciences and Applications 2013年第2期4卷 153-161页

作者： Mohamed Amine Zenasni Said Benfarhi andré merlin Stéphane Molina Béatrice George Bahia Meroufel Institute of Sciences and Technology Department of Sciences Bechar University Bechar Algeria Institute of Sciences Department of Chemistry Batna University Batna Algeria Laboratory of Studies and Research on Material Wood (LERMAB) University of Lorraine Nancy France Laboratory of Studies and Research on Material Wood (LERMAB) University of Lorraine Nancy France.

Maghnite clay obtained from Tlemcen, Algeria was investigated to remove heavy metal ion from wastewater. Thus, the present study includes the adsorption of Ni(II) in aqueous solution on maghnite clay through the process of adsorption under various conditions (with variable concentration of metal ion, temperature, pH and mixing time). Increasing pH favours the removal of metal ions till they are precipitated as the insoluble hydroxides. The uptake is rapid with maximum adsorption being observed within 10 min for Ni(II). In addition, the results obtained from adsorption isotherm indicated that these data can be better fitted with the Langmuir and Freundlich equations than the Dubinin-Radushke- vich (D-R) equation.

关键词： Natural Maghnite Ni(II) Adsorption