ABSTRACT In the present study, we investigated the kinetics, equilibrium, and thermodynamic principles governing the removal of the amaranth dye (AMD), from artificial wastewater using 2D ZIF‐L(Co) synthesized through an eco‐friendly green synthesis (water as green solvent) technique. To optimize the most suitable parameters of the adsorption process, adsorption experiments were conducted at various contact times, solution pH levels, adsorbent dosages, initial dye concentrations, and in presence of different salts, as well as at different temperatures. Adsorptive results indicate that ZIF‐L(Co) achieved 99.40% adsorptive removal of AMD within 30 min at an initial dye concentration of 60 ppm. The optimal pH for maximal AMD removal using ZIF‐L(Co) (98.55%) was observed around 7. The kinetic study revealed that the adsorptive removal of AMD on ZIF‐L(Co) was best described by a pseudo‐2nd‐order kinetic model and was controlled by chemisorption. The absorption isotherm of AMD closely follows Langmuir's isotherm, indicating a favored monolayer structure with a maximum adsorption capacity of approximately 134.17 mg/g. Thermodynamic analysis revealed that the adsorption process was spontaneous, feasible, and endothermic in nature. The adsorptive binding of AMD on ZIF‐L(Co) was directed through electrostatic interaction and π−π stacking interaction that takes place between the solid/solution interface of ZIF‐L(Co) and AMD.
Yasmin et al. (Tue,) studied this question.