Exploring the Use of Design of Experiments in the Removal of Methylene Blue Dye from Aqueous Solution Using Functionalized Activated Carbon of Rosa Canina-L

This study aims is to assess the tetraethylenepentamine-functionalized Rosa Canina-L fruits activated carbon prepared by microwave-assisted technique for the removal of Methylene Blue dye from an aqueous solution. The morphological and anatomical characterization of the developed adsorbent was carried out using various analytical techniques such as Fourier Transform Infrared Spectroscopy and Field emission scanning electron microscopy. The surface morphology and physical condition of the absorbent surface show a porous morphology that contains numerous deep holes suitable for dye absorption. Taguchi design of the experiment was used to find the best conditions for the removal of MB dye from the aqueous solution. The effects of different parameters such as pH, adsorbent dose, reaction time, initial dye concentration, and temperature at 3 different levels were considered using an L27 Taguchi method. Analysis of data was performed using one- way variance and calculation of signal-to-noise rate. Based on signal- to- noise ratios, the optimum process conditions were pH 4, adsorbent dose 0.03 g, contact time 30 min, initial MB concentration 25 mg/L and temperature 298 K. According to one- way variance results, the influence of the controllable factors in descending order is pH > adsorbent dose > temperature > initial dye concentration > contact time. Moreover, the adsorption behavior of this adsorbent fits well with the Langmuir isotherm and pseudo-second-order kinetic model. The whole process of adsorption of Methylene Blue dye onto this adsorbent was found to be spontaneous and exothermic under standard conditions.