Adsorption kinetics of reactive dye onto modified palm fiber activated carbon

The palm fiber was carbonized and then modified by MgO in precipitation-burning oxidation method for dealing with dyeing wastewater. The presence of MgO on the surface of the modified palm fiber activated carbon( MgO / PAC) was confirmed by scanning electron microscopy( SEM),FT-IR spectroscopy and the true density method. The adsorptive capacity for Reactive Brilliant Red X-3B of the palm fiber activated carbon before and after modification was tested by static absorption experiments. The adsorption kinetics of dyes onto MgO modified plam fiber activated carbon was investigated by varying dye initial concentrations and pH values. The MgO modification significantly improves the adsorption capacity of palm fiber activated carbon; and when the ratio of MgO to carbon is 2. 5∶ 1,the adsorption of Reactive Brilliant Red X-3B onto the MgO modified palm fiber activated carbon was increased by a factor of about 8,it followed the pseudo second-order kinetic model. The whole absorptive process was not only controlled by the intra-particle diffusion but also by extra-particle diffusion process.