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This study mainly focuses on the preparation, characterization, and sorption performance for Cu(II) and Zn(II) by using nano-alumina material (NA) synthesized through the sol-gel method. The SEM, EDS, FT-IR, and XRD analysis methods were implemented to identify the micromorphology and crystal structure of the synthesized NA absorbent and its structure after the adsorbing procedure. The effect of effective variables including various absorbent dose, contact time, initial ion concentration, and temperature on the removal of Cu(II) and Zn(II) from aqueous solution by using NA was investigated through a single factor experiment. Kinetic studies indicated that adsorption of copper and zinc ions by NA was chemical adsorption. The adsorption isotherm data were fitted by Langmuir (R 2 : 0.919, 0.914), Freundlich (R 2 : 0.983, 0.993), and Temkin (R 2 : 0.876, 0.863) isotherms, indicating that copper and zinc ions were easily adsorbed by NA with maximum adsorption capacities of 87.7 and 77.5 mg/g for Cu 2+ and Zn 2+ , respectively. Thermodynamic parameters indicated that the adsorption of Cu 2+ was spontaneous(G<0) and the adsorption of Zn 2+ might not be spontaneous (G > 0) by NA. Graphical abstract ᅟ.

Fe-based amorphous alloys have been proved to exhibit excellent degradation properties for the removal of copper ions from simulated wastewater. Compared with crystalline iron, amorphous alloy has higher removal efficiency, lower reaction activation energy and high corrosion current density owing to its unique surface mobility. The copper ion can be reduced to less than 0.5 or 1 ppm at different initial concentrations. Even at a lower concentration of copper ions, it also exhibits better performance. In comparison, the concentration of the copper ion would be higher than the prescribed discharge standard if the wastewater was treated by crystalline iron. This work provides a potential application of Fe - based amorphous in the removal of heavy metal ions from wastewater. • Fe-based amorphous alloys have excellent degradation properties for the removal of copper ions from wastewater. • The higher removal efficiency and lower reaction activation energy are because of the unique surface mobility. • The copper ion can be reduced to less than 0.5 or 1 ppm at different initial concentrations. [ABSTRACT FROM AUTHOR]