College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
J Hazard Mater. 2010 May 15;177(1-3):676-82. doi: 10.1016/j.jhazmat.2009.12.084. Epub 2009 Dec 24.
Immobilized Saccharomyces cerevisiae on the surface of chitosan-coated magnetic nanoparticles (SICCM) was applied as a new magnetic adsorbent for the adsorption of Cu(II) from aqueous solution. The prepared magnetic adsorbent was characterized by TEM, XRD and FTIR. TEM images indicated that S. cerevisiae was immobilized on the surface of chitosan-coated magnetic nanoparticles (CCM) successfully, and conglobation was not observed. The XRD pictures suggested that the Fe(3)O(4) nanoparticles were pure Fe(3)O(4) with a spinel structure and that the immobilizing process did not result in the phase change of Fe(3)O(4). Factors that influence the adsorption of Cu(II) were investigated, which included the initial pH of Cu(II) solution, initial concentration of Cu(II) solution and contact time. The optimum pH for Cu(II) absorption was 4.5. The highest removal efficiency of 96.8% was reached when the initial Cu(II) concentration was 60 mg L(-1), and the adsorption capacity was increased with the increase of initial concentration of Cu(II). In particular, SICCM was highly efficient for the fast adsorption of Cu(II) within the first 10 min, and adsorption equilibrium could be achieved in 1h. Equilibrium studies show that the data of Cu(II) adsorption follow the Langmuir model. The maximum adsorption capacity for Cu(II) was estimated to be 144.9 mg g(-1) with a Langmuir adsorption equilibrium constant of 0.0719 L mg(-1) at 301 K.
壳聚糖包覆磁性纳米粒子固定化酿酒酵母（SICCM）作为一种新型的磁性吸附剂，用于从水溶液中吸附 Cu(II)。通过 TEM、XRD 和 FTIR 对制备的磁性吸附剂进行了表征。TEM 图像表明，S. cerevisiae 成功地固定在壳聚糖包覆的磁性纳米粒子（CCM）的表面上，没有观察到聚集。XRD 图谱表明，Fe(3)O(4)纳米粒子为纯尖晶石结构的 Fe(3)O(4)，且固定化过程不会导致 Fe(3)O(4)的相变化。考察了影响 Cu(II)吸附的因素，包括 Cu(II)溶液的初始 pH 值、Cu(II)溶液的初始浓度和接触时间。Cu(II)吸收的最佳 pH 值为 4.5。当初始 Cu(II)浓度为 60mg/L 时，去除效率最高可达 96.8%，吸附容量随初始 Cu(II)浓度的增加而增加。特别是，SICCM 对 Cu(II)的快速吸附在最初的 10 分钟内非常有效，1 小时内即可达到吸附平衡。平衡研究表明，Cu(II)吸附数据符合 Langmuir 模型。在 301 K 时，Cu(II)的最大吸附容量估计为 144.9mg/g，Langmuir 吸附平衡常数为 0.0719L/mg。
