EVALUATION OF PEANUT SHELLAS AN INEXPENSIBLE SORPTION MATERIAL FOR EXTRACTION OF THE METHYLENE BLUE DYE FROM AQUEOUS SOLUTION
The work presents the results of experimental studies to determine the possibility of extracting the dye of the brand "methylene Blue" (MB) from the aquatic environment in a sorption manner using peanut shell. The surface structure of the peanut peel was studied using ascanning electron microscope Tescan MIRA 3LMU(Czech Republic). Thermal modification was carried out by heating materials in a muffle furnace of the type "Loip LF-7/13-G2" (Russia) at a given temperature. The studies used ground peanut shell with a particle size of less than 0.315 mm and from 0.315 to 1.4 mm. The initial and equilibrium MB concentration was determined by the photocolorimetric method. It was found that the sorption capacity for native peanut shell is 222 mmol / dm3 or 71 mg / g, and forthermally modified at 300 ° C - 0.228 mmol / g or 72.35 mg / g. Based on the adsorption isotherms, the constants of the Langmuir and Freindlich equations were obtained. The isotherms correspond to type I sorption isotherms and describe the monomolecular adsorption of the dye "methylene blue" on the native and thermally modified peanut shell. The Langmuir and Freindlich constants are calculated in the equations describing the adsorption isotherms. Two steps of the kinetic sorption isotherms are approximated in the coordinates 1 / A = f (1 / C), logA = f (log C) using the Microsoft Office Excel software. It has been established that the dye sorption process satisfactorily describes the Langmuir and Freindlich equations with rather high values of the correlation coefficient which indicates the possibility of using these models to describe the process.