Studies of the adsorption kinetics process for removal of methylene blue dye by residue of grenadine bark extraction

Abstract

This study makes it possible to prove that an inexpensive material, namely the residue of grenadine bark extraction (GB), can be used to remove a dye from the textile industry, in particular methylene blue (MB). For this reason, different techniques of characterization of the GB adsorbent have been used such as: scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and the zero charge point. On the other hand, batch studies have been used to evaluate the effect of initial concentration, contact time, adsorbent dose, pH and temperature on the variation in uptake capacity. In this case, the results show that a very fast adsorption kinetics reaching 98% within the first 10 minutes. Additionally, kinetic studies of dye on MB carried out the pseudo-second order at different dye concentration values. Besides, the Langmuir model describes satisfactory adsorption on the GB. Further, thermodynamic studies have indicated that dye adsorption process by grenadine bark (GB) was spontaneous, physisorption and endothermic in naturel