Adsorption of the Pesticide (Divid Top) via the Use of Tea Leaf Residues

Yosef Othman Homeda

doi:10.51699/cajmns.v7i1.3097

Authors

Yosef Othman Homeda Tikrit University, College of Education for Pure Sciences, Department of Chemistry, Iraq

DOI:

https://doi.org/10.51699/cajmns.v7i1.3097

Keywords:

Adsorption Process, Endothermic, Gibbs Free Energy, Tea Leaf Waste, Pesticide Removal

Abstract

The possibility of using ground tea leaves as an efficient, inexpensive, and environmentally friendly adsorbent to remove the pesticide Divid Top from aqueous environments has been studied, and the main conclusions can be summarized. The kinetic study was conducted in stages, and the thermal equilibrium study was carried out under different experimental conditions. in terms of contact time initial pesticide concentration, and the amount of adsorbent material. The study was conducted and showed good results. Adsorption was analyzed using pseudo-first-order and pseudo-second-order kinetic models. The study found that it follows the pseudo-second-order kinetic model better, which supports the hypothesis that the mechanism involved is chemical adsorption, involving binding forces between pesticide molecules and the active groups on the surface of tea leaves. The equilibrium data were represented using the Langmuir adsorption model, with a correlation coefficient (R2=0.9135), indicating that the adsorption process occurs in the form of a monolayer over a surface with homogeneous energy. As for the efficiency and feasibility of the adsorption process, the maximum adsorption capacity (qm = 0.25 mg/g) according to the Langmuir model, and the separation factor value (RL = 0.091) confirmed that the adsorption process is highly preferred under the studied conditions. Thermodynamics: Thermodynamic calculations have proven that the adsorption process is endothermic due to the positive values of the enthalpy content (∆H). The negative values of the Gibbs free energy (∆G) at high temperatures revealed the spontaneity of the reaction and the increased removal efficiency with rising temperature.

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