چكيده به لاتين
In recent decades, pollution from factories and industries has been one of the major problems in the world, which has led scientists around the world to find a solution to this problem. The use of the absorption process is extremely popular among other processes due to its ease, low cost, availability and high process efficiency. The use of high efficiency adsorbents is the main issue in the adsorption process. In the present study, microcrystalline cellulose (MCC) was extracted from peanut shell, which is an important green waste in agriculture, using acid / base hydrolysis. After extraction of this compound, cellulose-based cryogels were produced as adsorbents for the adsorption of rhodamine B aromatic dye through the urea / sodium solvent system. In fact, a simple process to make these adsorbents from biomass - a peanut shell left over from a lignocellulose compound - using a mechanochemichal process without the use of additives or surface changes. This technique involves grinding and ball milling, which ultimately produces two types of adsorbents. Characterization of these adsorbents using scanning electron microscopy (SEM) analysis, X-ray diffraction (XRD), infrared spectroscopy (FT-IR), nitrogen adsorption technique, atomic force microscopy (AFM) and thermal calorimetric analysis (TGA) Parameters affecting the adsorption process such as equilibrium time, initial solution concentration, solution pH, adsorbent amount and solution temperature were studied and the results were reported. To evaluate the results of the adsorption process, Langmuir and Freundlich was used and it was found that the adsorption on the cellulose-based cryogel adsorbent obtained by the two methods of grinding and ball milling follows the Langmuir adsorption model. Kinetic studies also show that both types of adsorbents follow pseudo-second-order kinetics.
