ISOTHERM ADSORPTION OF 40-μm ZEOLITE PARTICLES FOR TREATMENT OF DYE WASTEWATER

This study aimed to determine the characteristics of the adsorption isotherm of curcumin dye solution by 40-mu m zeolite particles. The 40-mu m zeolite particles measuring were put in a certain concentration of curcumin dye solution and then the change in the concentration of the curcumin dye solution was analysed. Curcumin solution has an ideal size (less than 1.4 nm), so it is ideal to be used as a model for dye wastewater. To support our analysis, we use 4 isotherm models, namely Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich The results showed that the 40-mu m zeolite particles were able to adsorb curcumin solution as a dye wastewater model. The adsorption model that is suitable in this study, that is the Langmuir (R-2=0.868) which explains the favourable monolayer adsorption. The most suitable results are followed by the DubininRadushkevich model (R-2=0.938). The Dubinin-Radushkevich model describes the adsorption process following the pore-filling mechanism, this is following the characteristics of zeolites which have many pores. However, the adsorption process in this study is also compatible with the Freundlich and the Temkin adsorption models, in which the regression values respectively are 0.819; and 0.764. Freundlich's model shows the value of n=0.515 1 and 1/n=1.940 1 explaining that the adsorption process occurs in a multilayer with chemical interactions and cooperative type. The Temkin model also shows a BT value of 22.801 which explains the adsorption that occurred in the chemical interaction. This research provides new information regarding the use of zeolite particles of 40-mu m size for the adsorption process, especially in dye wastewater.