Anbinder Pablo S, Macchi Carlos, Amalvy Javier, Somoza Alberto
Instituto de Física de Materiales Tandil - IFIMAT (UNCPBA) and CIFICEN (UNCPBA-CICPBA-CONICET), Pinto 399, (B7000GHG) Tandil, Argentina.
Instituto de Física de Materiales Tandil - IFIMAT (UNCPBA) and CIFICEN (UNCPBA-CICPBA-CONICET), Pinto 399, (B7000GHG) Tandil, Argentina.
Carbohydr Polym. 2019 Oct 15;222:114987. doi: 10.1016/j.carbpol.2019.114987. Epub 2019 Jun 13.
A study of the structural changes at micro- and nano-scale in a chitosan matrix after the adsorption of different metal ions is presented. Toward this aim, samples of chitosan films soaked in different concentrations of copper(II) and chromium(VI) aqueous solutions were prepared. Cu and Cr ions were selected as sorbates since they have different ionic properties. The effect of the adsorbed metal ions on the microstructure of the chitosan matrices were studied using Fourier transformed infrared spectroscopy, UV-vis spectroscopy, differential scanning calorimetry and thermogravimetric analysis. To go further into the study of the samples at the molecular level, the nuclear technique positron annihilation lifetime spectroscopy was used. Results are discussed in terms of the interaction between the metal ions and the chitosan functional groups.
本文介绍了壳聚糖基质在吸附不同金属离子后微观和纳米尺度上的结构变化研究。为此，制备了浸泡在不同浓度铜（II）和铬（VI）水溶液中的壳聚糖薄膜样品。选择铜离子和铬离子作为吸附质，因为它们具有不同的离子特性。利用傅里叶变换红外光谱、紫外可见光谱、差示扫描量热法和热重分析研究了吸附的金属离子对壳聚糖基质微观结构的影响。为了进一步在分子水平上研究样品，使用了核技术正电子湮没寿命谱。根据金属离子与壳聚糖官能团之间的相互作用对结果进行了讨论。
