Efficient removal of Acid Orange 7 dye from water using the strongly basic anion exchange resin Amberlite IRA-958

The removal of Acid Orange 7 dye from water using the macroporous strongly basic anion exchange resin was investigated using the batch method with a particular reference to the effects of the initial dye concentration, the phase contact time, temperature, pH, the presence of inorganic salts (NaH2PO4, Na2HPO4, Na2SO4) and surfactants (SDS, CTAB, Triton-100) on adsorption. Next, the desorption of the dye adsorbed on the anion exchanger was studied using the batch method by testing different solutions, namely aqueous and aqueous–methanol solutions of HCl, NaOH, and NaCl. Also the anion exchanger behavior with artificial and real wastewater samples was studied with very promising results.

Research highlights
► Amberlite IRA-958 has very high adsorption capacity for Acid Orange 7.
► The effect of many factors on the dye adsorption is negligible or little.
► The resin exhibits good adsorption characteristics for model and real wastewater.
► Only the difficulties with carrying out efficient desorption are problem.