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The textile waste contains some colors, and also metals which can damage our body and environment. The example of the harmfull substance contain in the waste is methl Violet and lead metal. Methyl violet can cause inhallation and hurt alimentary tract if swallowed. Lead also cause some environmental effects. Lead can accumulated in soils, especially those with a high organic content, where it remains for hundred to thousand years. The solution of the problem is to reduce the contaminant by adsorption. Adsorpstion require adsorbent to perform. Adsorbent can be produced by biomaterial like a peanut shell. Peanut shell contains cellulose which can bend the color and metal so it will separate the contaminant from the water.This research have a purpose to modified and activate the adsorbent to optimal condition, define a characteristic of the adsorbent and define the adsorb capacity. This research is using a peanut shell as the material and furnaced at 450 degree within 2 hours, and screened to 80 mesh and agitated with KOH 50% to remove impuritues from the shells within 30 minutes at 180 rpm. The adsorben then modified by nitric acid 10%, 20%, 30%, 40%, and 50% with 240 rpm agitation to increase the functional groups at 90 degrees celcius within 120 minutes.