Abstract:

A novel magnetic nano-adsorbent was prepared by covalent binding of high-deacetylated-degree carboxymethylated chitosan onto the surface of magnetic Fe₃O₄ nanoparticles，which were fabricated by a chemical coprecipitation method. The adsorbent was characterized by transmission electron microscopy（TEM），Fourier transform infrared spectroscopy（FT-IR），X-ray diffraction patterns（XRD），and vibrating sample magnetometer（VSM）. Moreover，the adsorption property of the magnetic nano-adsorbent for Cu(Ⅱ) ions was also investigated. The results showed that the adsorption capability was significantly affected by pH，and the adsorption capacity was the best at pH=5. The adsorption data obeyed the Langmuir equation with a maximum adsorption capacity of 71.43 mg/g and a Langmuir adsorption equilibrium constant of 0.0543 L/mg.

摘要：

采用化学共沉淀法制备磁性Fe₃O₄纳米粒子，通过在磁性Fe₃O₄纳米粒子表面接枝高脱乙酰度羧甲基化壳聚糖（CMC），制备了一种新型磁性纳米吸附剂。通过透射电镜、红外光谱、X射线衍射、振动样品磁强计对其进行了表征，着重研究其对Cu(Ⅱ)离子的吸附性能。结果表明：溶液pH值能显著影响吸附剂对Cu(Ⅱ)的吸附效果，pH值为5时其效果最佳。等温吸附数据符合Langmuir 模型，T＝298 K、pH＝5、V＝5 mL时，吸附剂的饱和吸附容量q_m高达71.43 mg/g，吸附常数为0.0543 L/mg。