采用静电纺丝技术制备纳米壳聚糖纤维增强六价铬吸附。
Enhanced chromium (VI) adsorption using nanosized chitosan fibers tailored by electrospinning.
机构信息
National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
出版信息
Carbohydr Polym. 2015 Jul 10;125:206-13. doi: 10.1016/j.carbpol.2015.02.037. Epub 2015 Feb 26.
Stacked chitosan nanofibers with an average diameter of 75 nm were successfully produced by electrospinning using 5 wt% chitosan in acetic acid as the spinning solution. The fibers were then cross-linked with glutaraldehyde to remove chromium [Cr(VI)] from water via static adsorption. It was found that the adsorption correlated well with pseudo-second order kinetic model, and followed a mixed isotherm of Freundlich and Langmuir. The maximum nanofibers adsorption capacity was 131.58 mg/g, more than doubled that of chitosan powders. Common co-ions such as Cl(-), NO3(-), Na(+), Ca(2+) and Mg(2+) had little or no effect on the adsorption but SO4(2-) was an exception. Fourier transform infrared spectroscopy and X-ray photoelectron spectrophotometer analyses indicated that both amino and hydroxyl groups of chitosan were engaged in the adsorption.
成功地通过静电纺丝制备了平均直径为 75nm 的堆叠壳聚糖纳米纤维，使用 5wt%的壳聚糖在醋酸中作为纺丝溶液。然后，用戊二醛对纤维进行交联，通过静态吸附从水中去除铬 [Cr(VI)]。研究发现，吸附与准二级动力学模型很好地相关，遵循 Freundlich 和 Langmuir 混合等温线。最大纳米纤维吸附容量为 131.58mg/g，是壳聚糖粉末的两倍多。常见的共离子，如 Cl(-)、NO3(-)、Na(+)、Ca(2+)和 Mg(2+)，对吸附的影响很小或没有，但 SO4(2-)是个例外。傅里叶变换红外光谱和 X 射线光电子能谱分析表明，壳聚糖的氨基和羟基都参与了吸附。
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