Theoretical and Experimental Study of the Adsorption of Natural Red 4 Dye from Synthetic Aqueous Media Using a Low-cost Silica-smectite Composite

Jean Marie Kepdieu (), Chantale Njiomou Djangang (), Jacques Romain Njimou (), Gustave Tchanang (), Cyprien Joel Ekani (), Sanda Andrada Maicaneanu () and Chedly Tizaoui ()

American Journal of Physical Sciences, 2023, vol. 1, issue 2, 1 - 22

Abstract: Purpose: A study of the removal of dye Natural red 4 (NR4) by a low-cost silica-smectite clay labeled SSC was carried out. Methodology: Batch tests were carried on with some processing parameters namely initial dye concentration (10 - 50 mg/L), temperature (25 - 65 °C), adsorbent dose (1 - 5 g/L), initial pH (4 - 8) and contact time (0 - 120 min). Findings: The Energy of adsorption was less than 20 kJ/mol showing a physisorption process. Also, thermodynamics parameters such as enthalpy of activation ∆H* (19.0 kJ/mol), entropy of activation ∆S* (- 024 kJ/mol/K) and Gibbs free energy of activation ∆G* (90.57 - 100.17 kJ/mol) revealed that the adsorption of NR4 molecules onto SSC was endothermic and with no significant changes in the internal structure of the adsorbent. The pseudo-first order and pseudo-second order had a good correlation with experimental data with R2 = 0.99 and R2 = 0.98 respectively. Langmuir isotherm model matched well the equilibrium data with a maximum adsorption capacity Qm of 25.55 mg/g. and a correlation value of 0.98. Unique Contribution to Theory, Policy and Practice: The newly synthesized and characterized low-cost silica-smectite composite is effective in the adsorptive removal of natural red 4 dye from water wastes.

Keywords: Adsorption; Dye; Natural Red 4; Thermodynamic and Kinetics (search for similar items in EconPapers)
Date: 2023
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