Batch adsorption results showed that under optimal sorption condition including initial dye concentration 24.62 mg/L, pH 1.0,
contact time 21 h, and temperature 298 k the maximum and the minimum adsorption capacities were
2.401 mg/g and 1.705 mg/g for bamboo charcoals activated with orthophosphoric acid and with potassium
hydroxide, respectively.