ABSTRACT

The adsorption of copper ions on magnetic adsorbents with amino-functionalized polymers (DETA/SiO₂/Fe₃O₄) 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/SiO₂/Fe₃O₄ 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/SiO₂/Fe₃O₄ 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/SiO₂/Fe₃O₄ was provided by 1.0 M HNO₃. The novel magnetic nano-adsorbents could not only be regenerated by HNO₃ solutions but also reused by the recovery of magnetic force without requiring further downstream treatment.

摘要

已经研究了具有氨基官能化聚合物（DETA/SiO ₂ /Fe ₃ O ₄）的磁性吸附剂上铜离子的吸附。此外，使用 FTIR、TGA、TEM、VSM 和 BET 确认了磁性纳米吸附剂的结构和表征。结果表明，DETA/SiO ₂ /Fe ₃ O ₄表现出顺磁性，可以很容易地从悬浮溶液中回收和快速分离。提出吸附铜离子的最佳pH值范围为5~6，298 K时的最大吸附容量（q _m）和活化能（E _a）为13.459 mg g^-1和 22.421 kJ mol ^-1，分别。_{DETA/SiO 2} /Fe ₃ O ₄对铜离子的吸附行为与Langmuir等温线而非Freundlich方程非常吻合。准二级模型最能描述吸附动力学，1.0 M HNO _{3提供了从DETA/SiO 2} /Fe ₃ O ₄中解吸铜离子的最佳条件（99%） 。新型磁性纳米吸附剂不仅可以通过HNO ₃溶液再生，还可以通过磁力回收重复使用，无需进一步的下游处理。