The removal of RB19 by modified bentonite at various adsorbent dosages (0.01–0.04 g) for the volume of 50 mL at the dye concentration 2* 10-4 mol dm-3 was investigated and it was found out that uptake of RB19 increased by the amount of the adsorbent added. The maximum dye removal was achieved with the amount of 0.025 g.