Development Of A Catalytic Support Based On Ziziphus Spina-Christi Seed Shells, Application To The Adsorption Of Crystal Violet In Aqueous Solution

Hinimdou B, Djonga PND, Bagamla W, Nongni JPT and Harouna M

Published on: 2022-01-08

Abstract

The objective of this study is the development of a natural residue and it application by the adsorption of an cationic dye know for it toxicity which is crystal Violet (C.V) contained in water. This rexperienced natural waste is the hulls of the grains of Z-Spina collected in the region of far North Cameroon (Maroua), these residues are very abundant and can compete with conventional materials: Coal, silica gel, alimin. The caracterization of the materials after physicochemical treatement has shown the possibility of its reconvery. The X-ray fluorescence technique (RFX) has shown that it is rich in carbon, oxygent and iron. While IR Spectroscopy has proven that it works well. Adsorption test have also shown that under appropriate conditions the retention rate is greater than 80%. The results also showed that pH is a very important parameter when processing colored solutions. The experimental parameters such as pH of solution, contact time, adsorbent dose, initial concentration of CV and temperature were analyzed.  To analyze the adsorption mechanism of Langmuir isotherms, freundlich models were studied Dubunin-Kaganer-Radushkevich (D-K-R) as well as the kinetic models of pseudo-first order, pseudo-second order, Elovich and Intraparticular Diffusion. The adsorbend showed good potential for adsorption at pH 3.0 with a yield of elimination of CV by active carbon was 86.93% at 30°C. Adsorption equilibrium was reached after 20min. Thermodynamic parameters such as ?H°= 12.14 Kj/mol, ?G°=-5.83.10^-4 at -6.21.10^-4 Kj/mol and ?S°= 1864.9 Kj/mol proved that adsorption mechanism of CV is possible, with the physisorption, spontaneouse and exothermic in the ranges of temperature 30-60°C.