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The adsorption of copper ions on magnetic adsorbents with amino-functionalized polymers (DETA/SiO 2 /Fe 3 O 4 ) has been investigated. In addition, the structure and characterization of magnetic nano-adsorbents were confirmed using FTIR, TGA, TEM, VSM, and BET. The results showed that DETA/SiO 2 /Fe 3 O 4  exhibited a paramagnetic behaviour and could be easily recovered and quickly separated from a suspension solution. The optimum pH level for adsorption of copper ions was proposed to be in the range of pH level from 5 to 6, and the maximum adsorption capacity ( q m) and activated energy ( E a) at 298 K was 13.459 mg g −1  and 22.421 kJ mol −1 , respectively. The copper ions adsorption behaviour by DETA/SiO 2 /Fe 3 O 4  was in good agreement with the Langmuir isotherm rather than Freundlich equation. A pseudo-second-order model could best describe the adsorption kinetics, and the optimal condition of copper ions desorption (99%) from DETA/SiO 2 /Fe 3 O 4  was provided by 1.0 M HNO 3 . The novel magnetic nano-adsorbents could not only be regenerated by HNO 3  solutions but also reused by the recovery of magnetic force without requiring further downstream treatment.

Magnetic nanoadsorbents with amino-functionalized polymers for magnetic separation removal of copper ion