【摘要】 制备了磁性纳米复合吸附剂PAM@Fe₃O₄/MnO₂（PFM）,用于含铜废水的吸附实验研究,考察了吸附剂投加量、重金属溶液初始浓度、吸附时间等因素对吸附效果的影响。实验结果表明:磁性纳米复合吸附剂PFM可有效去除水中的铜离子,在Cu²⁺浓度为50 mg/L,pH为6.0,吸附剂量为1.6 g/L的条件下,在400 min达到吸附平衡,吸附容量可达到30.29 mg/g,Cu²⁺去除率可达到97%。吸附-再生循环实验证实PFM具有良好的再生性能,在去除Cu²⁺方面具有很好的实际应用前景。VSM分析表明:纳米PFM具备超顺磁性和铁磁性的优势;PFM的XRD图谱显示,PAM附着于纳米Fe₃O₄/MnO₂表面,增强了其与溶液中金属离子接触的表面积,有利于对金属离子的吸附;在纳米PFM吸附剂的FTIR中出现PAM中的酰胺键,印证了Fe₃O₄/MnO₂与PAM成功制备为磁性纳米复合吸附剂PFM。更多还原

【Abstract】 A novel magnetic composite adsorbent of PAM@Fe₃O₄/MnO₂（PFM） was prepared and introduced to remove copper ions from water. The effects of adsorbent dosage, initial concentration of the heavy metal solution, and the adsorption time for the Cu²⁺ removal were investigated. The experimental results showed that the magnetic composite adsorbent of PFM could effectively remove copper ions from water. Under the conditions of Cu²⁺ concentration of 50 mg/L, pH of 6.0, and adsorbent dosage of 1.6 g/L, the adsorption equilibrium was gained within 400 min. The adsorption capacity could reach 30.29 mg/g and the removal rate of Cu²⁺ was as high as 97% then. Adsorption-regeneration cycles confirmed that the adsorbent could be reused successfully for Cu²⁺ adsorption and had promising potential for practical application. The VSM analysis showed that PFM had the advantages of superparamagnetism and ferromagnetism. The XRD pattern indicated that PAM adhered to the surface of nano-Fe₃O₄/MnO₂, which enhanced the surface area of contact with metal ions in solution and would be beneficial to the adsorption of metal ions. The amide bonds that appeared in the FTIR spectra analysis indicated that magnetic composite adsorbent was successfully prepared by Fe₃O₄/MnO₂ and PAM.更多还原