Abstract:

For removing the dye from wastewater, the wheat residue was modified into an anion exchanger. The adsorption kinetics of Reactive Brilliant Red K-2BP (RBR K-2BP) from aqueous solutions onto modified wheat residue(MWR)were  studied in a batch reactor. Adsorption experiments were carried out as a function of pH and adsorbent dosage. In addition, the kinetic data were respectively fitted by pseudo-first-order equation, pseudo-second-order equation, Elovich equation and the intraparticle diffusion model. It was found that the pseudo-second-order equation could  provide  the best correlation to the data. The intra-particle diffusion was the main rate-controlling step for the adsorption of RBR K-2BP onto MWR. The adsorption activation energy of dye was 17.21kJ／mol, which indicated that the adsorption type  whole process was mainly of the physical adsorption.
 

Key words: modified wheat residue, adsorption, reactive brilliant red K-2BP, adsorption kinetics