THE REMOVAL OF DYE COLOURS FROM AQUEOUS SOLUTIONS BY ADSORPTION ON LOW-COST MATERIALS

摘要

The ability of five low cost adsorbents -- rice husk, cotton, bark, hair and coal -- to adsorb two basic dyes, namely Safranine and Methylene Blue, has been studied. Equilibrium isotherms have been determined and analysed using the Langmuir equations. The monolayer saturation capacities for Safranine are l l l9, 838, 875, l90 and l20 mg g~-1 adsorbent and for Methylene Blue are 914, 312, 277, l58 and 250 mg g~-1 adsorbent for bark, rice husk, cotton waste, hair and coal respectively. A limited number of fixed bed column studies have been performed and the bed depth service time for each dye--adsorbent system has been determined.