Removal of textile dyes from aqueous solutions using low cost Moroccan clay

International Conference on Renewable Energies and Energy Efficiency 2017

Bencheqroun, Z.^1 ; Chaouki, Z.^1 ; Hadri, M.^1,2 ; Nawdali, M.^3 ; Draoui, K.^2 ; Valdés, H.^4 ; Zaitan, H.^1

Laboratory LCMC, Faculty of Science and Technology, Sidi Mohamed Ben Abdellah University, B.P. 2202, Fez, Morocco^1

Laboratory MSI, Faculty of Sciences, Abdel Malek Essaadi University, B.P. 2121, M'hannech II, Tetouan

93002, Morocco^2

Laboratory LCMC, Polydisciplinary Faculty, Sidi Mohamed Ben Abdellah University, B.P 1223, Taza, Morocco^3

Laboratorio de Tecnologías Limpias, Universidad Católica de la Santísima Concepción, Alonso de Ribera 2850, Concepción, Chile^4

关键词: Adsorption capacities;    Cationic and anionic dyes;    Contaminated water;    Elimination of dyes;    Monolayer adsorption;    Operating condition;    Potential adsorbents;    Pseudo-second-order kinetic models;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/161/1/012009/pdf
DOI  :  10.1088/1755-1315/161/1/012009

来源: IOP

【 摘 要 】

This study aims to evaluate the technical feasibility to apply natural clay from Fez area as a low cost alternative adsorbent to remove dyes from contaminated waters. Methylene blue (MB) and congo red (CR) are used here as representatives of cationic and anionic dyes normally present in wastewater from textile industry. This material was characterised by different physical-chemical methods, including BET, X-ray fluorescence and pHPZC. Additionally, the influence of operating conditions such as contact time, adsorbent dosages and pH were evaluated. Experimental results show that the adsorption processes takes place very rapid, reaching the equilibrium at 30 and 45 min for MB and CR, respectively. Maximum adsorption capacities result to be pH-depends. Hence, MB adsorption is favoured under basic pH conditions, whereas CR does it at acid pH. A pseudo-second-order kinetic model provides the best fit to the experimental data of MB and CR adsorption. Adsorption data are better described by Langmuir and Toth isotherm models. Adsorption occurs with a maximum monolayer adsorption capacity of 195 and 185 mg g-1for MB and CR, respectively. Experimental results indicate that the Moroccan clay could be used as a potential adsorbent for the elimination of dyes from contaminated waters, at a lower cost.