Removal of basic dye using raw and acid activated …
Preparation of acid activated bentonite (AAB) Twenty grams of RB were activated with various volumes (20, 51, 102 and 204 ml) of 2.0 M H 2 SO 4 at 80 °C for 2 h. The acid activated samples were washed thoroughly with deionized water untill pH 5.0. The ratio of RB to H 2 SO 4 was changed between 0.2 and 2.0 by mass.