Author(s)

Fumba Gaston¹, Essomba Jean Serge^1,2, Ankoro Naphtali Odogu³, Kouotou Daouda¹, Bélibi Bélibi Placide Désiré¹, Ndi Julius Nsami^1*, Ketcha Mbadcam Joseph¹

¹Laboratory of Applied Physical and Analytical Chemistry, Department of Inorganic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé ,Cameroon.
²Inorganic and Physical Chemistry Lab, CSIR-Central Leather Research Institute, Chennai, India.
³Department of Chemistry, Faculty of Science, University of Buea, Buea, Cameroon.

The main objective of the study is to improve the removal efficiency of Ourlago-kaolin (Kao), sodium montmorillonite (Na-MMT), and two formulated clay-lime (F13 and F23) towards CI Acid Orange 52 dye (AO52). F13 and F23 were obtained by chemical stabilization through thermal treatment at 300°C. Fourier Transform Infrared spectra showed different surface functional groups on the clay materials, X-ray diffraction patterns revealed the raw materials contain many crystalline phases, scanning electron microscopy micrographs showed the variation of the layered structures of different clay materials, energy dispersive X-Ray analysis micrographs revealed compositional information and thermogravimetric-differential scanning calorimetry curves indicated the higher weight loss of 11.26% and 11.38% were observed for F13 and F23 respectively. BET surface area analyzed gave 133.0071 m²•g⁻¹ for F13 and 132.34803 m²•g⁻¹ for F23. The optimum pH value was 2.0 for Kao and Na-MMT. The adsorption experiments indicated that F13 and F23 have the maximum uptake abilities of 7.8740 and 3.1645 mg•g⁻¹, respectively, compared to Kao (0.8761 mg•g⁻¹) and Na-MMT (2.6178 mg•g⁻¹). The pseudo-second-order model well described the adsorption kinetic model of AO52 dye onto the overall samples; Langmuir and Freundlich’s isotherms appropriately described the uptake mechanism. The positive values of ∆G° and negative value ∆H° indicated that the adsorption process was spontaneous and endothermic for Na-MMT, and non-spontaneous and exothermic for Kao, F13, and F23 because of their positive values of ∆G° and negative value of ∆H°. The modified clays have higher adsorption capacities and better life cycles compared hence opening new avenues for efficient wastewater treatment.

Ourlago-Kaolin, Sodium Montmorillonite, Formulated Clay Lime, Adsorption, Acid Dye, Thermodynamic

Gaston, F. , Serge, E. , Odogu, A. , Daouda, K. , Désiré, B. , Nsami, N. and Joseph, K. (2023) CI Acid Orange 52 Dye Removal Using Natural and Formulated Clay-Lime Materials: Isotherm, Kinetic and Thermodynamic Studies. Journal of Materials Science and Chemical Engineering, 11, 48-74. doi: 10.4236/msce.2023.1111005.