Chitosan-Coated Magnetic Nanoparticles with Low Chitosan Content Prepared in One-Step
Chitosan-Coated Magnetic Nanoparticles with Low Chitosan Content Prepared in One-Step
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DOI：
10.1155/2012/327562
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Lopez, Raul G.
中科院分区：
文献类型：
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作者：
Osuna, Yolanda;Gregorio-Jauregui, Karla M.;Lopez, Raul G.
采用共沉淀法制备了壳聚糖包覆的磁性纳米颗粒(CMNP)。CMNP表现出较高的磁化强度和超顺磁性。根据电子显微镜测量，它们是由平均直径9.5 nm的核心和非常薄的壳聚糖层组成的。傅立叶变换红外光谱分析结果表明得到了CMNP，热重分析表明其由95wt%的磁性纳米颗粒和5wt%的壳聚糖组成。67%的铅去除效率表明，CMNP表面只有60%的氨基与铅结合，这可能是由于纳米粒子在再分散过程中发生了一定程度的絮凝作用。在本研究中得到的壳聚糖与磁性纳米颗粒的重量比非常低，仅为0.053，而且沉淀反应的产率很高(接近97%)。
Chitosan-coated magnetic nanoparticles (CMNP) were obtained at 50 degrees C in a one-step method comprising coprecipitation in the presence of low chitosan content. CMNP showed high magnetization and superparamagnetism. They were composed of a core of 9.5 nm in average diameter and a very thin chitosan layer in accordance with electron microscopy measurements. The results from Fourier transform infrared spectrometry demonstrated that CMNP were obtained and those from thermogravimetric analysis allowed to determine that they were composed of 95 wt% of magnetic nanoparticles and 5 wt% of chitosan. 67% efficacy in the Pb+2 removal test indicated that only 60% of amino groups on CMNP surface bound to Pb, probably due to some degree of nanoparticle flocculation during the redispersion. The very low weight ratio chitosan to magnetic nanoparticles obtained in this study, 0.053, and the high yield of the precipitation reactions (approximate to 97%) are noticeable.