ADSORPTION ISOTHERMS AND KINETICS STUDIES OF THE REMOVAL OF METHYLENE BLUE FROM AQUEOUS SOLUTIONS...

Under various experimental circumstances, the adsorption of methylene blue (MB) from aqueous solution onto activated carbon produced from Chrysophyllum albidum seed shell was examined. Fourier Transform Infrared (FTIR) Spectrophotometry and a Scanning Electron Microscope were used to characterise the Steam Activated C. albidum Shell (SACAS) carbon (SEM). Experiments in batch mode were carried out to see how effective SACAS is at removing MB from aqueous solutions. To explore the uptake of MB from the solution, equilibrium isotherm studies were conducted by altering the initial concentration of MB solution, pH of solution, contact time, and SACAS dosage. The following ideal circumstances were used to achieve high SACAS removal efficiencies: initial MB concentration of 100 mg/L (96.8%), adsorbents dose of 1.5 g (95.4%), contact time of 120 minutes (94.76%), and pH of 9. (95.3 percent ). With increasing starting concentrations of the MB solution, the adsorption of the MB by the adsorbent was found to rise. In addition, the adsorption rate increased when the pH rose. The Langmuir and Freundlich models were used to examine the equilibrium data of the MB adsorption onto SACAS. The Langmuir adsorption isotherm model (R2 = 0.942) fit the data better than the Freundlich model (R2 = 0.925). For the adsorption of MB, the Langmuir dimensionless constant, RL, ranges from 0.012 to 0.053. The RL result favours the MB's adsorption. Pseudo-first-order and pseudo-second-order kinetic models were used to assess the kinetic data. The pseudo-second-order kinetics (R2 = 0.99) could be used to describe the MB's adsorption. The FTIR bands at 3745.45 cm-1, 3427.61 cm-1, 2926.06 cm-1, 1637 cm-1, and between 1197.59 cm-1 and 1124.75 cm-1 were identified as hydroxyl, amine, alkyl chain, amide, and phosphate, respectively, and the P-O vibration of the C-PO32- moiety at 1041.32 cm-1, amine R-NH2 at 3030 cm-1, carboxylic acids at 28 The average pore size on the activated carbon was 20 and 50 m before and after MB adsorption, according to scanning electron microscopy (SEM) examination. It can be concluded that activated carbons generated from C. albidum Shell (SACAS) have good potential for removing MB from aqueous solutions, and so can be used as a low-cost alternative to commercial adsorbents for colour removal from textile wastewater.

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