Batch Study, Kinetic and Equilibrium Isotherms Studies of Dye Adsorption of Jumputan Wastewater onto Betel Nuts Adsorbent

Adsorption is an alternative process which can reduce the contaminant of the Jumputan wastewater. Betel nuts activated carbon is one of bio-sorbent that can be utilized for dye adsorption process. The activated carbon is made with carbonization temperature of 500 °C and the HCl concentration of 0.5 M. The adsorption process applies in a batch system with the agitation speed of 150 rpm. The aim of this research is to get kinetic and equilibrium isotherm of dye adsorption in the Jumputan wastewater. This research is done by varied the stirring time (5, 10, 15, 20, and 25 minutes), the mass of the adsorbent (5, 10, 15, 20, and 25 grams). The dye concentration is analyzed by using a portable spectrophotometer. The results show that the adsorption follows pseudo-second-order kinetic with R² of 0.929 and k value of 0.00008 min⁻¹. Equilibrium isotherm describes by Langmuir model with R² of 0.999 and maximum adsorption capacity of 12.99 mg/g. (paper)