Adsorption behaviors and mechanism of Cu2 in solution by Pomelo peel powder composite superabsorbent (PP-SA) were studied. The influences of intial CuSO4 concentration and adsorption time on Cu2 adsorption capacity of PP-SA were investigated. The thermodynamic adsorption isotherms and adsorption kinetics models were adopted to fit the data. PP-SA saturated with Cu2 was characterized by X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TG) and the adsorption mechanisms were proposed. The results showed that the adsorption capacity of Cu2 for PP-SA in 2000 mg/L CuSO4 solution was the highest, reaching to 199.3 mg/g in about 4 h. The Cu2 adsorption process followed the pseudo-second-order kinetic model and the data were fitted to the Langmuir isotherms. The Cu2 adsorption on PP-SA can be achieved by ion exchange adsorption, chelation and electrostatic attraction. The copper species absorbed in PP-SA exist as Cu2 , a small part of which is CuSO4.