Isotherm and Kinetic Study of Dyes Solution

One of the biggest global concerns is industrial wastewater, particularly in light of newly discovered materials like synthetic dyes like methyl orange (MO), methylene blue (MB), and rhodamin B (RhB), which are continuously released into the environment and have the potential to cause catastrophic environmental issues. Adsorption is one of the outstanding processes for dyes wastewater. It's an effective, efficient and economical treatment method for the removal of dyes. The isotherm and adsorption kinetics are the important characteristics that can describe the adsorption mechanism. The objective of this research is to study the isotherms and kinetic model of the Rh-B, MB and MO dye adsorption process using adsorbents made from low rank coal from East Kalimantan. 60 mg of adsorbent was placed in contact with the dye's solution (50, 100, 150, 200, and 250 mg/L) in the required time (5, 10, 20, 30, 40, 50, and 60 min) with shaker agitation maintained at 150 rpm, 300C. The dyes concentration was monitored at predetermined time intervals. At the end of the process, the shaker was turned off, and the remained concentration of dyes was measured using UV-Vis spectrophotometer. The pseudo second order kinetic model and the Langmuir adsorption isotherm fit the dye solution's adsorption mechanisms (Rh-B, MB, and MO)