Lasmana, AndrikMukhtar, AkmalTamboesai, Emrizal Mahidin2016-10-122016-10-122016-10-12wahyu sari yenihttp://repository.unri.ac.id/xmlui/handle/123456789/8692The increase in the adsorption capacity of the zeolite can be done by modifying the zeolite. This research aims to use the activated zeolite for adsorption of the dye congo red with some parameters. Preparation of adsorbent begins with the physical activation by heating for 2 hours at a temperature of 3000C. Zeolite was characterized using X-Ray Diffraction (XRD) and Fourier transform infrared (FTIR). Parameters for congo red dye adsorption were analyzed mass, contact time and pH. Adsorptiont process was done by varying the mass (0.1, 0.5, 1 and 1.5 g) , the contact time (30,60,90 and 120 minutes), and pH (1, 3, 5, 7 dan 9) and measured using UV-Vis Spectrofotometri. All adsorption values obtained were compared between natural zeolite activated and non-activation of natural zeolite. The results indicate that activation zeolite better absorption than the non-activation of zeolite. The optimum condition for adsorption was at mass (0.1 g), time (90 minutes) and pH 3 which activated zeolite for adsoption percentage reached 95.49% while the non-activation zeolite adsorption percentage of only 44.65%ennatural zeoliteactivationadsorptioncongo redstudent Paper Post Degree