Abstract
The adsorption of reactive dye (RB 222) onto cross-linked chitosan-rice husk ash composite beads was investigated. BET, SEM and FTIR methodologies were used to characterize the properties of the composite beads. The results indicated that the BET surface area values of cross-linked chitosan-rice husk ash composite beads were 4 .740 m2 /g . The effects of various parameters on the adsorption behavior of composite beads including pH (2-12), temperature (20°C, 30°C and 40°C), and initial concentration (10-850 mg/L) were studied. The dye concentrations after adsorption process were measured using a UV/VIS Spectrophotometer at 611 nm. For the effect of pH on reactive dye (RB 222) removal, the highest value of dye removal was obtained at pH 2. The isotherm study was fitted by Freundlich Isotherm. Moreover, thermodynamics of adsorption was also found that the △Go had negative values. It indicates the feasibility of adsorption process at temperature below 40°C.
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