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The coal based bottom ash from Thailand Power Plant has been used as the adsorbent for the removal of reactive dye in aqueous solution. The bottom ash was pretreated with 1N HCl, 1N HNO3, and 30% H2O2 before the adsorption tests. Adsorption of the pretreated bottom ash has been studied as a function of particle size, contact time, initial solution pH, and initial solution concentration. The ability...