Investigations on the Fixed-bed Column Performance of Acid Brown 75 Adsorption by Surface Modified Fly Ash Granules

摘要

Adsorption potential of surface modified granule (SM-G) to remove acid brown 75 (AB 75) from aqueous solution was investigated using fixed-bed column mode. To produce SM–G, lignite fly ash was agglomerated into porous granules by an extruder at 800°C and surface–modified with a cationic surfactant, Hexadecyltrimetylammonium Bromide (HDTMA–Br). The performance of the fixed-bed column was evaluated to assess the effect of various process variables, viz., of bed height, flow rate and initial feed concentration on breakthrough time and adsorption capacity. The bed depth service time (BDST) model was applied to the data for predicting breakthrough curves and to determine the characteristic parameters. The highest experimental and theoretical bed capacities were obtained to be 55.3 mg of AB 75 adsorbed per gram of SM-G. The results indicated that the SM-G is a suitable adsorbent for the removal of AB 75 from aqueous solution.