The adsorption of Co(II) and Mn(II) onto the 001 x 7 x 7 ion-exchange resin has been studied. Batch experiments were performed to study the effects of various parameters such as stirring speed, temperature, dosage of resin, and pH on the adsorption process. The adsorption capacity (K(F)) for cobalt and manganese were calculated from the Freundlich adsorption isotherm. The adsorption of cobalt and manganese on the 001 x 7 x 7 ion-exchange resin followed the pseudosecond-order equation. The adsorption and desorption of Co(II) and Mn(II) onto the 001 x 7 x 7 ion-exchange resin were investigated by using a dynamic method. The effects of flow rate, temperature, and desorbant concentration were studied. The studies showed that this cation-exchange resin can be used as an efficient adsorbent material for the removal of cobalt and manganese from pure terephthalic acid (PTA) wastewater.