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 2 104 mol dm3 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. This amount of adsorbent was used for
further experiments.