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The fly ash zeolite (FAZ) was prepared by hydrothermal method using fly ash (FA) as raw material. The fly ash zeolite loaded silica (FAZS) modified by Na2SiO3 was used as an adsorbent for Cu2+ wastewater treatment. FAZS was characterized by means of X-ray diffraction(XRD), scanning electron microscopy (SEM) and pore size distribution measurement by nitrogen adsorption(BET). The effects of Cu2+ adsorptions were investigated in different pH, FAZS dosage, adsorption time on the adsorption process when copper ions were used as adsorptive ions. The results showed that the synthesized FAZS had a strong potential for Cu2+ removal. Under 298 K, the adsorption on the FAZS reached equilibrium within 80 min, and the process followed pseudo-second-order kinetic. The adsorption of heavy metal ions in aqueous solution belonged to a chemisorption process. The highest adsorption capacity was approximately 127.4 mg/g at 298 K. The adsorption process conformed to Langmuir model. The thermodynamic data showed that the adsorption process was endothermic and spontaneous. [ABSTRACT FROM AUTHOR]